cuDF 0.13.0 (Date TBD)

New Features

PR #3577 Add initial dictionary support to column classes
PR #3777 Add support for dictionary column in gather
PR #3693 add string support, skipna to scan operation
PR #3662 Define and implement shift.
PR #3861 Added Series.sum feature for String
PR #4069 Added cast of numeric columns from/to String
PR #3681 Add cudf::experimental::boolean_mask_scatter
PR #4040 Add support for n-way merge of sorted tables
PR #4053 Multi-column quantiles.

Improvements

PR #3525 build.sh option to disable nvtx
PR #3748 Optimize hash_partition using shared memory
PR #3808 Optimize hash_partition using shared memory and cub block scan
PR #3698 Add count_(un)set_bits functions taking multiple ranges and updated slice to compute null counts at once.
PR #3909 Move java backend to libcudf++
PR #3971 Adding as_table to convert Column to Table in python
PR #3910 Adding sinh, cosh, tanh, asinh, acosh, atanh cube root and rint unary support.
PR #3972 Add Java bindings for left_semi_join and left_anti_join
PR #3975 Simplify and generalize data handling in Buffer
PR #3985 Update RMM include files and remove extraneously included header files.
PR #3601 Port UDF functionality for rolling windows to libcudf++
PR #3911 Adding null boolean handling for copy_if_else
PR #4003 Drop old to_device utility wrapper function
PR #4002 Adding to_frame and fix for categorical column issue
PR #4009 build script update to enable cudf build without installing
PR #3897 Port cuIO JSON reader to cudf::column types
PR #4008 Eliminate extra copy in column constructor
PR #4013 Add cython definition for io readers cudf/io/io_types.hpp
PR #4014 ORC/Parquet: add count parameter to stripe/rowgroup-based reader API
PR #3880 Add aggregation infrastructure support for cudf::reduce
PR #4059 Add aggregation infrastructure support for cudf::scan
PR #4021 Change quantiles signature for clarity.
PR #4029 Port stream_compaction.pyx to use libcudf++ APIs
PR #4031 Docs build scripts and instructions update
PR #4062 Improve how java classifiers are produced
PR #4038 JNI and Java support for is_nan and is_not_nan
PR #4067 Removed unused CATEGORY type ID.
PR #3891 Port NVStrings (r)split_record to contiguous_(r)split_record
PR #4072 Allow round_robin_partition to single partition
PR #4064 Add cudaGetDeviceCount to JNI layer
PR #4083 Use two partitions in test_groupby_multiindex_reset_index
PR #4071 Add Java bindings for round robin partition
PR #4079 Simply use mask.size to create the array view
PR #4092 Keep mask on GPU for bit unpacking
PR #4081 Copy from Buffer's pointer directly to host
PR #4098 Remove legacy calls from libcudf strings column code

Bug Fixes

PR #3888 Drop ptr=None from DeviceBuffer call
PR #3976 Fix string serialization and memory_usage method to be consistent
PR #3902 Fix conversion of large size GPU array to dataframe
PR #3953 Fix overflow in column_buffer when computing the device buffer size
PR #3959 Add missing hash-dispatch function for cudf.Series
PR #3970 Fix for Series Pickle
PR #3964 Restore legacy NVStrings and NVCategory dependencies in Java jar
PR #3982 Fix java unary op enum and add missing ops
PR #3999 Fix issue serializing empty string columns (java)
PR #3979 Add name to Series serialize and deserialize
PR #4005 Fix null mask allocation bug in gather_bitmask
PR #4000 Fix dask_cudf sort_values performance for single partitions
PR #4007 Fix for copy_bitmask issue with uninitialized device_buffer
PR #4037 Fix JNI quantile compile issue
PR #4054 Fixed JNI to deal with reduction API changes
PR #4052 Fix for round-robin when num_partitions divides nrows.
PR #4061 Add NDEBUG guard on constexpr_assert.
PR #4049 Fix cudf::split issue returning one less than expected column vectors
PR #4065 Parquet writer: fix for out-of-range dictionary indices
PR #4066 Fixed mismatch with dtype enums
PR #4080 Fix multi-index dask test with sort issue
PR #4084 Update Java for removal of CATEGORY type
PR #4086 ORC reader: fix potentially incorrect timestamp decoding in the last rowgroup
PR #4089 Fix dask groupby mutliindex test case issues in join
PR #4076 All null string entries should have null data buffer

cuDF 0.12.0 (04 Feb 2020)

New Features

PR #3759 Updated 10 Minutes with clarification on how dask_cudf uses cudf API
PR #3224 Define and implement new join APIs.
PR #3284 Add gpu-accelerated parquet writer
PR #3254 Python redesign for libcudf++
PR #3336 Add from_dlpack and to_dlpack
PR #3555 Add column names support to libcudf++ io readers and writers
PR #3527 Add string functionality for merge API
PR #3610 Add memory_usage to DataFrame and Series APIs
PR #3557 Add contiguous_split() function.
PR #3619 Support CuPy 7
PR #3604 Add nvtext ngrams-tokenize function
PR #3403 Define and implement new stack + tile APIs
PR #3627 Adding cudf::sort and cudf::sort_by_key
PR #3597 Implement new sort based groupby
PR #3776 Add column equivalence comparator (using epsilon for float equality)
PR #3667 Define and implement round-robin partition API.
PR #3690 Add bools_to_mask
PR #3761 Introduce a Frame class and make Index, DataFrame and Series subclasses
PR #3538 Define and implement left semi join and left anti join
PR #3683 Added support for multiple delimiters in nvtext.token_count()
PR #3792 Adding is_nan and is_notnan
PR #3594 Adding clamp support to libcudf++

Improvements

PR #3124 Add support for grand-children in cudf column classes
PR #3292 Port NVStrings regex contains function
PR #3409 Port NVStrings regex replace function
PR #3417 Port NVStrings regex findall function
PR #3351 Add warning when filepath resolves to multiple files in cudf readers
PR #3370 Port NVStrings strip functions
PR #3453 Port NVStrings IPv4 convert functions to cudf strings column
PR #3441 Port NVStrings url encode/decode to cudf strings column
PR #3364 Port NVStrings split functions
PR #3463 Port NVStrings partition/rpartition to cudf strings column
PR #3502 ORC reader: add option to read DECIMALs as INT64
PR #3461 Add a new overload to allocate_like() that takes explicit type and size params.
PR #3590 Specialize hash functions for floating point
PR #3569 Use np.asarray in StringColumn.deserialize
PR #3553 Support Python NoneType in numeric binops
PR #3511 Support DataFrame / Series mixed arithmetic
PR #3567 Include strides in __cuda_array_interface__
PR #3608 Update OPS codeowner group name
PR #3431 Port NVStrings translate to cudf strings column
PR #3507 Define and implement new binary operation APIs
PR #3620 Add stream parameter to unary ops detail API
PR #3593 Adding begin/end for mutable_column_device_view
PR #3587 Merge CHECK_STREAM & CUDA_CHECK_LAST to CHECK_CUDA
PR #3733 Rework hash_partition API
PR #3655 Use move with make_pair to avoid copy construction
PR #3402 Define and implement new quantiles APIs
PR #3612 Add ability to customize the JIT kernel cache path
PR #3647 Remove PatchedNumbaDeviceArray with CuPy 6.6.0
PR #3641 Remove duplicate definitions of CUDA_DEVICE_CALLABLE
PR #3640 Enable memory_usage in dask_cudf (also adds pd.Index from_pandas)
PR #3654 Update Jitify submodule ref to include gcc-8 fix
PR #3639 Define and implement nans_to_nulls
PR #3561 Rework contains implementation in search
PR #3616 Add aggregation infrastructure for argmax/argmin.
PR #3673 Parquet reader: improve rounding of timestamp conversion to seconds
PR #3699 Stringify libcudacxx headers for binary op JIT
PR #3697 Improve column insert performance for wide frames
PR #3653 Make gather_bitmask_kernel more reusable.
PR #3710 Remove multiple CMake configuration steps from root build script
PR #3657 Define and implement compiled binops for string column comparisons
PR #3520 Change read_parquet defaults and add warnings
PR #3780 Java APIs for selecting a GPU
PR #3796 Improve on round-robin with the case when number partitions greater than number of rows.
PR #3805 Avoid CuPy 7.1.0 for now
PR #3758 detail::scatter variant with map iterator support
PR #3882 Fail loudly when creating a StringColumn from nvstrings with > MAX_VAL(int32) bytes
PR #3823 Add header file for detail search functions
PR #2438 Build GBench Benchmarks in CI
PR #3713 Adding aggregation support to rolling_window
PR #3875 Add abstract sink for IO writers, used by ORC and Parquet writers for now
PR #3916 Refactor gather bindings

Bug Fixes

PR #3618 Update 10 minutes to cudf and cupy to hide warning that were being shown in the docs
PR #3550 Update Java package to 0.12
PR #3549 Fix index name issue with iloc with RangeIndex
PR #3562 Fix 4GB limit for gzipped-compressed csv files
PR #2981 enable build.sh to build all targets without installation
PR #3563 Use __cuda_array_interface__ for serialization
PR #3564 Fix cuda memory access error in gather_bitmask_kernel
PR #3548 Replaced CUDA_RT_CALL with CUDA_TRY
PR #3486 Pandas > 0.25 compatability
PR #3622 Fix new warnings and errors when building with gcc-8
PR #3588 Remove avro reader column order reversal
PR #3629 Fix hash map test failure
PR #3637 Fix sorted set_index operations in dask_cudf
PR #3663 Fix libcudf++ ORC reader microseconds and milliseconds conversion
PR #3668 Fixing CHECK_CUDA debug build issue
PR #3684 Fix ends_with logic for matching string case
PR #3691 Fix create_offsets to handle offset correctly
PR #3687 Fixed bug while passing input GPU memory pointer in nvtext.scatter_count()
PR #3701 Fix hash_partition hashing all columns instead of columns_to_hash
PR #3694 Allow for null columns parameter in csv_writer
PR #3706 Removed extra type-dispatcher call from merge
PR #3704 Changed the default delimiter to whitespace for nvtext methods.
PR #3741 Construct DataFrame from dict-of-Series with alignment
PR #3724 Update rmm version to match release
PR #3743 Fix for None data in __array_interface__
PR #3731 Fix performance of zero sized dataframe slice
PR #3709 Fix inner_join incorrect result issue
PR #3734 Update numba to 0.46 in conda files
PR #3738 Update libxx cython types.hpp path
PR #3672 Fix to_host issue with column_view having offset
PR #3730 CSV reader: Set invalid float values to NaN/null
PR #3670 Floor when casting between timestamps of different precisions
PR #3728 Fix apply_boolean_mask issue with non-null string column
PR #3769 Don't look for a name attribute in column
PR #3783 Bind cuDF operators to Dask Dataframe
PR #3775 Fix segfault when reading compressed CSV files larger than 4GB
PR #3799 Align indices of Series inputs when adding as columns to DataFrame
PR #3803 Keep name when unpickling Index objects
PR #3804 Fix cuda crash in AVRO reader
PR #3766 Remove references to cudf::type_id::CATEGORY from IO code
PR #3817 Don't always deepcopy an index
PR #3821 Fix OOB read in gpuinflate prefetcher
PR #3829 Parquet writer: fix empty dataframe causing cuda launch errors
PR #3835 Fix memory leak in Cython when dealing with nulls in string columns
PR #3866 Remove unnecessary if check in NVStrings.create_offsets
PR #3858 Fixes the broken debug build after #3728
PR #3850 Fix merge typecast scope issue and resulting memory leak
PR #3855 Fix MultiColumn recreation with reset_index
PR #3869 Fixed size calculation in NVStrings::byte_count()
PR #3868 Fix apply_grouped moving average example
PR #3900 Properly link NVStrings and NVCategory into tests
PR #3868 Fix apply_grouped moving average example
PR #3871 Fix split_out error
PR #3886 Fix string column materialization from column view
PR #3893 Parquet reader: fix segfault reading empty parquet file
PR #3931 Dask-cudf groupby .agg multicolumn handling fix
PR #4017 Fix memory leaks in GDF_STRING cython handling and nans_to_nulls cython

cuDF 0.11.0 (11 Dec 2019)

New Features

PR #2905 Added Series.median() and null support for Series.quantile()
PR #2930 JSON Reader: Support ARROW_RANDOM_FILE input
PR #2956 Add cudf::stack and cudf::tile
PR #2980 Added nvtext is_vowel/is_consonant functions
PR #2987 Add inplace arg to DataFrame.reset_index and Series
PR #3011 Added libcudf++ transition guide
PR #3129 Add strings column factory from std::vectors
PR #3054 Add parquet reader support for decimal data types
PR #3022 adds DataFrame.astype for cuDF dataframes
PR #2962 Add isnull(), notnull() and related functions
PR #3025 Move search files to legacy
PR #3068 Add scalar class
PR #3094 Adding any and all support from libcudf
PR #3130 Define and implement new column_wrapper
PR #3143 Define and implement new copying APIs slice and split
PR #3161 Move merge files to legacy
PR #3079 Added support to write ORC files given a local path
PR #3192 Add dtype param to cast DataFrame on init
PR #3213 Port cuIO to libcudf++
PR #3222 Add nvtext character tokenizer
PR #3223 Java expose underlying buffers
PR #3300 Add DataFrame.insert
PR #3263 Define and implement new valid_if
PR #3278 Add to_host utility to copy column_view to host
PR #3087 Add new cudf::experimental bool8 wrapper
PR #3219 Construct column from column_view
PR #3250 Define and implement new merge APIs
PR #3144 Define and implement new hashing APIs hash and hash_partition
PR #3229 Define and implement new search APIs
PR #3308 java add API for memory usage callbacks
PR #2691 Row-wise reduction and scan operations via CuPy
PR #3291 Add normalize_nans_and_zeros
PR #3187 Define and implement new replace APIs
PR #3356 Add vertical concatenation for table/columns
PR #3344 java split API
PR #2791 Add groupby.std()
PR #3368 Enable dropna argument in dask_cudf groupby
PR #3298 add null replacement iterator for column_device_view
PR #3297 Define and implement new groupby API.
PR #3396 Update device_atomics with new bool8 and timestamp specializations
PR #3411 Java host memory management API
PR #3393 Implement df.cov and enable covariance/correlation in dask_cudf
PR #3401 Add dask_cudf ORC writer (to_orc)
PR #3331 Add copy_if_else
PR #3427 Define and Implement new multi-search API
PR #3442 Add Bool-index + Multi column + DataFrame support for set-item
PR #3172 Define and implement new fill/repeat/copy_range APIs
PR #3490 Add pair iterators for columns
PR #3497 Add DataFrame.drop(..., inplace=False) argument
PR #3469 Add string functionality for replace API
PR #3273 Define and implement new reduction APIs

Improvements

PR #2904 Move gpu decompressors to cudf::io namespace
PR #2977 Moved old C++ test utilities to legacy directory.
PR #2965 Fix slow orc reader perf with large uncompressed blocks
PR #2995 Move JIT type utilities to legacy directory
PR #2927 Add Table and TableView extension classes that wrap legacy cudf::table
PR #3005 Renames cudf::exp namespace to cudf::experimental
PR #3008 Make safe versions of is_null and is_valid in column_device_view
PR #3026 Move fill and repeat files to legacy
PR #3027 Move copying.hpp and related source to legacy folder
PR #3014 Snappy decompression optimizations
PR #3032 Use asarray to coerce indices to a NumPy array
PR #2996 IO Readers: Replace cuio::device_buffer with rmm::device_buffer
PR #3051 Specialized hash function for strings column
PR #3065 Select and Concat for cudf::experimental::table
PR #3080 Move valid_if.cuh to legacy/
PR #3052 Moved replace.hpp functionality to legacy
PR #3091 Move join files to legacy
PR #3092 Implicitly init RMM if Java allocates before init
PR #3029 Update gdf_ numeric types with stdint and move to cudf namespace
PR #3052 Moved replace.hpp functionality to legacy
PR #2955 Add cmake option to only build for present GPU architecture
PR #3070 Move functions.h and related source to legacy
PR #2951 Allow set_index to handle a list of column names
PR #3093 Move groupby files to legacy
PR #2988 Removing GIS functionality (now part of cuSpatial library)
PR #3067 Java method to return size of device memory buffer
PR #3083 Improved some binary operation tests to include null testing.
PR #3084 Update to arrow-cpp and pyarrow 0.15.0
PR #3071 Move cuIO to legacy
PR #3126 Round 2 of snappy decompression optimizations
PR #3046 Define and implement new copying APIs empty_like and allocate_like
PR #3128 Support MultiIndex in DataFrame.join
PR #2971 Added initial gather and scatter methods for strings_column_view
PR #3133 Port NVStrings to cudf column: count_characters and count_bytes
PR #2991 Added strings column functions concatenate and join_strings
PR #3028 Define and implement new gather APIs.
PR #3135 Add nvtx utilities to cudf::nvtx namespace
PR #3021 Java host side concat of serialized buffers
PR #3138 Move unary files to legacy
PR #3170 Port NVStrings substring functions to cudf strings column
PR #3159 Port NVStrings is-chars-types function to cudf strings column
PR #3154 Make table_view_base.column() const and add mutable_table_view.column()
PR #3175 Set cmake cuda version variables
PR #3171 Move deprecated error macros to legacy
PR #3191 Port NVStrings integer convert ops to cudf column
PR #3189 Port NVStrings find ops to cudf column
PR #3352 Port NVStrings convert float functions to cudf strings column
PR #3193 Add cuPy as a formal dependency
PR #3195 Support for zero columned table_view
PR #3165 Java device memory size for string category
PR #3205 Move transform files to legacy
PR #3202 Rename and move error.hpp to public headers
PR #2878 Use upstream merge code in dask_cudf
PR #3217 Port NVStrings upper and lower case conversion functions
PR #3350 Port NVStrings booleans convert functions
PR #3231 Add column::release() to give up ownership of contents.
PR #3157 Use enum class rather than enum for mask_allocation_policy
PR #3232 Port NVStrings datetime conversion to cudf strings column
PR #3136 Define and implement new transpose API
PR #3237 Define and implement new transform APIs
PR #3245 Move binaryop files to legacy
PR #3241 Move stream_compaction files to legacy
PR #3166 Move reductions to legacy
PR #3261 Small cleanup: remove == true
PR #3271 Update rmm API based on rmm.reinitialize(...) change
PR #3266 Remove optional checks for CuPy
PR #3268 Adding null ordering per column feature when sorting
PR #3239 Adding floating point specialization to comparators for NaNs
PR #3270 Move predicates files to legacy
PR #3281 Add to_host specialization for strings in column test utilities
PR #3282 Add num_bitmask_words
PR #3252 Add new factory methods to include passing an existing null mask
PR #3288 Make bit.cuh utilities usable from host code.
PR #3287 Move rolling windows files to legacy
PR #3182 Define and implement new unary APIs is_null and is_not_null
PR #3314 Drop cython from run requirements
PR #3301 Add tests for empty column wrapper.
PR #3294 Update to arrow-cpp and pyarrow 0.15.1
PR #3310 Add row_hasher and element_hasher utilities
PR #3272 Support non-default streams when creating/destroying hash maps
PR #3286 Clean up the starter code on README
PR #3332 Port NVStrings replace to cudf strings column
PR #3354 Define and implement new scatter APIs
PR #3322 Port NVStrings pad operations to cudf strings column
PR #3345 Add cache member for number of characters in string_view class
PR #3299 Define and implement new is_sorted APIs
PR #3328 Partition by stripes in dask_cudf ORC reader
PR #3243 Use upstream join code in dask_cudf
PR #3371 Add select method to table_view
PR #3309 Add java and JNI bindings for search bounds
PR #3305 Define and implement new rolling window APIs
PR #3380 Concatenate columns of strings
PR #3382 Add fill function for strings column
PR #3391 Move device_atomics_tests.cu files to legacy
PR #3303 Define and implement new stream compaction APIs copy_if, drop_nulls, apply_boolean_mask, drop_duplicate and unique_count.
PR #3387 Strings column gather function
PR #3440 Strings column scatter function
PR #3389 Move quantiles.hpp + group_quantiles.hpp files to legacy
PR #3397 Port unary cast to libcudf++
PR #3398 Move reshape.hpp files to legacy
PR #3395 Port NVStrings regex extract to cudf strings column
PR #3423 Port NVStrings htoi to cudf strings column
PR #3425 Strings column copy_if_else implementation
PR #3422 Move utilities to legacy
PR #3201 Define and implement new datetime_ops APIs
PR #3421 Port NVStrings find_multiple to cudf strings column
PR #3448 Port scatter_to_tables to libcudf++
PR #3458 Update strings sections in the transition guide
PR #3462 Add make_empty_column and update empty_like.
PR #3465 Port aggregation traits and utilities.
PR #3214 Define and implement new unary operations APIs
PR #3475 Add bitmask_to_host column utility
PR #3487 Add is_boolean trait and random timestamp generator for testing
PR #3492 Small cleanup (remove std::abs) and comment
PR #3407 Allow multiple row-groups per task in dask_cudf read_parquet
PR #3512 Remove unused CUDA conda labels
PR #3500 cudf::fill()/cudf::repeat() support for strings columns.
PR #3438 Update scalar and scalar_device_view to better support strings
PR #3414 Add copy_range function for strings column
PR #3685 Add string support to contiguous_split.
PR #3471 Add scalar/column, column/scalar and scalar/scalar overloads to copy_if_else.
PR #3451 Add support for implicit typecasting of join columns

Bug Fixes

PR #2895 Fixed dask_cudf group_split behavior to handle upstream rearrange_by_divisions
PR #3048 Support for zero columned tables
PR #3030 Fix snappy decoding regression in PR #3014
PR #3041 Fixed exp to experimental namespace name change issue
PR #3056 Add additional cmake hint for finding local build of RMM files
PR #3060 Move copying.hpp includes to legacy
PR #3139 Fixed java RMM auto initalization
PR #3141 Java fix for relocated IO headers
PR #3149 Rename column_wrapper.cuh to column_wrapper.hpp
PR #3168 Fix mutable_column_device_view head const_cast
PR #3199 Update JNI includes for legacy moves
PR #3204 ORC writer: Fix ByteRLE encoding of NULLs
PR #2994 Fix split_out-support but with hash_object_dispatch
PR #3212 Fix string to date casting when format is not specified
PR #3218 Fixes row_lexicographic_comparator issue with handling two tables
PR #3228 Default initialize RMM when Java native dependencies are loaded
PR #3012 replacing instances of to_gpu_array with mem
PR #3236 Fix Numba 0.46+/CuPy 6.3 interface compatibility
PR #3276 Update JNI includes for legacy moves
PR #3256 Fix orc writer crash with multiple string columns
PR #3211 Fix breaking change caused by rapidsai/rmm#167
PR #3265 Fix dangling pointer in is_sorted
PR #3267 ORC writer: fix incorrect ByteRLE encoding of long literal runs
PR #3277 Fix invalid reference to deleted temporary in is_sorted.
PR #3274 ORC writer: fix integer RLEv2 mode2 unsigned base value encoding
PR #3279 Fix shutdown hang issues with pinned memory pool init executor
PR #3280 Invalid children check in mutable_column_device_view
PR #3289 fix java memory usage API for empty columns
PR #3293 Fix loading of csv files zipped on MacOS (disabled zip min version check)
PR #3295 Fix storing storing invalid RMM exec policies.
PR #3307 Add pd.RangeIndex to from_pandas to fix dask_cudf meta_nonempty bug
PR #3313 Fix public headers including non-public headers
PR #3318 Revert arrow to 0.15.0 temporarily to unblock downstream projects CI
PR #3317 Fix index-argument bug in dask_cudf parquet reader
PR #3323 Fix insert non-assert test case
PR #3341 Fix Series constructor converting NoneType to "None"
PR #3326 Fix and test for detail::gather map iterator type inference
PR #3334 Remove zero-size exception check from make_strings_column factories
PR #3333 Fix compilation issues with constexpr functions not marked __device__
PR #3340 Make all benchmarks use cudf base fixture to initialize RMM pool
PR #3337 Fix Java to pad validity buffers to 64-byte boundary
PR #3362 Fix find_and_replace upcasting series for python scalars and lists
PR #3357 Disabling column_view iterators for non fixed-width types
PR #3383 Fix : properly compute null counts for rolling_window.
PR #3386 Removing external includes from column_view.hpp
PR #3369 Add write_partition to dask_cudf to fix to_parquet bug
PR #3388 Support getitem with bools when DataFrame has a MultiIndex
PR #3408 Fix String and Column (De-)Serialization
PR #3372 Fix dask-distributed scatter_by_map bug
PR #3419 Fix a bug in parse_into_parts (incomplete input causing walking past the end of string).
PR #3413 Fix dask_cudf read_csv file-list bug
PR #3416 Fix memory leak in ColumnVector when pulling strings off the GPU
PR #3424 Fix benchmark build by adding libcudacxx to benchmark's CMakeLists.txt
PR #3435 Fix diff and shift for empty series
PR #3439 Fix index-name bug in StringColumn concat
PR #3445 Fix ORC Writer default stripe size
PR #3459 Fix printing of invalid entries
PR #3466 Fix gather null mask allocation for invalid index
PR #3468 Fix memory leak issue in drop_duplicates
PR #3474 Fix small doc error in capitalize Docs
PR #3491 Fix more doc errors in NVStrings
PR #3478 Fix as_index deep copy via Index.rename inplace arg
PR #3476 Fix ORC reader timezone conversion
PR #3188 Repr slices up large DataFrames
PR #3519 Fix strings column concatenate handling zero-sized columns
PR #3530 Fix copy_if_else test case fail issue
PR #3523 Fix lgenfe issue with debug build
PR #3532 Fix potential use-after-free in cudf parquet reader
PR #3540 Fix unary_op null_mask bug and add missing test cases
PR #3559 Use HighLevelGraph api in DataFrame constructor (Fix upstream compatibility)
PR #3572 Fix CI Issue with hypothesis tests that are flaky

cuDF 0.10.0 (16 Oct 2019)

New Features

PR #2423 Added groupby.quantile()
PR #2522 Add Java bindings for NVStrings backed upper and lower case mutators
PR #2605 Added Sort based groupby in libcudf
PR #2607 Add Java bindings for parsing JSON
PR #2629 Add dropna= parameter to groupby
PR #2585 ORC & Parquet Readers: Remove millisecond timestamp restriction
PR #2507 Add GPU-accelerated ORC Writer
PR #2559 Add Series.tolist()
PR #2653 Add Java bindings for rolling window operations
PR #2480 Merge custreamz codebase into cudf repo
PR #2674 Add contains for Index/Series/Column
PR #2635 Add support to read from remote and cloud sources like s3, gcs, hdfs
PR #2722 Add Java bindings for NVTX ranges
PR #2702 Add make_bool to dataset generation functions
PR #2394 Move rapidsai/custrings into cudf
PR #2734 Final sync of custrings source into cudf
PR #2724 Add libcudf support for contains
PR #2777 Add python bindings for porter stemmer measure functionality
PR #2781 Add issorted to is_monotonic
PR #2685 Add cudf::scatter_to_tables and cython binding
PR #2743 Add Java bindings for NVStrings timestamp2long as part of String ColumnVector casting
PR #2785 Add nvstrings Python docs
PR #2786 Add benchmarks option to root build.sh
PR #2802 Add cudf::repeat() and cudf.Series.repeat()
PR #2773 Add Fisher's unbiased kurtosis and skew for Series/DataFrame
PR #2748 Parquet Reader: Add option to specify loading of PANDAS index
PR #2807 Add scatter_by_map to DataFrame python API
PR #2836 Add nvstrings.code_points method
PR #2844 Add Series/DataFrame notnull
PR #2858 Add GTest type list utilities
PR #2870 Add support for grouping by Series of arbitrary length
PR #2719 Series covariance and Pearson correlation
PR #2207 Beginning of libcudf overhaul: introduce new column and table types
PR #2869 Add cudf.CategoricalDtype
PR #2838 CSV Reader: Support ARROW_RANDOM_FILE input
PR #2655 CuPy-based Series and Dataframe .values property
PR #2803 Added edit_distance_matrix() function to calculate pairwise edit distance for each string on a given nvstrings object.
PR #2811 Start of cudf strings column work based on 2207
PR #2872 Add Java pinned memory pool allocator
PR #2969 Add findAndReplaceAll to ColumnVector
PR #2814 Add Datetimeindex.weekday
PR #2999 Add timestamp conversion support for string categories
PR #2918 Add cudf::column timestamp wrapper types

Improvements

PR #2578 Update legacy_groupby to use libcudf group_by_without_aggregation
PR #2581 Removed managed allocator from hash map classes.
PR #2571 Remove unnecessary managed memory from gdf_column_concat
PR #2648 Cython/Python reorg
PR #2588 Update Series.append documentation
PR #2632 Replace dask-cudf set_index code with upstream
PR #2682 Add cudf.set_allocator() function for easier allocator init
PR #2642 Improve null printing and testing
PR #2747 Add missing Cython headers / cudftestutil lib to conda package for cuspatial build
PR #2706 Compute CSV format in device code to speedup performance
PR #2673 Add support for np.longlong type
PR #2703 move dask serialization dispatch into cudf
PR #2728 Add YYMMDD to version tag for nightly conda packages
PR #2729 Handle file-handle input in to_csv
PR #2741 CSV Reader: Move kernel functions into its own file
PR #2766 Improve nvstrings python cmake flexibility
PR #2756 Add out_time_unit option to csv reader, support timestamp resolutions
PR #2771 Stopgap alias for to_gpu_matrix()
PR #2783 Support mapping input columns to function arguments in apply kernels
PR #2645 libcudf unique_count for Series.nunique
PR #2817 Dask-cudf: read_parquet support for remote filesystems
PR #2823 improve java data movement debugging
PR #2806 CSV Reader: Clean-up row offset operations
PR #2640 Add dask wait/persist exmaple to 10 minute guide
PR #2828 Optimizations of kernel launch configuration for DataFrame.apply_rows and DataFrame.apply_chunks
PR #2831 Add column argument to DataFrame.drop
PR #2775 Various optimizations to improve getitem and setitem performance
PR #2810 cudf::allocate_like can optionally always allocate a mask.
PR #2833 Parquet reader: align page data allocation sizes to 4-bytes to satisfy cuda-memcheck
PR #2832 Using the new Python bindings for UCX
PR #2856 Update group_split_cudf to use scatter_by_map
PR #2890 Optionally keep serialized table data on the host.
PR #2778 Doc: Updated and fixed some docstrings that were formatted incorrectly.
PR #2830 Use YYMMDD tag in custreamz nightly build
PR #2875 Java: Remove synchronized from register methods in MemoryCleaner
PR #2887 Minor snappy decompression optimization
PR #2899 Use new RMM API based on Cython
PR #2788 Guide to Python UDFs
PR #2919 Change java API to use operators in groupby namespace
PR #2909 CSV Reader: Avoid row offsets host vector default init
PR #2834 DataFrame supports setting columns via attribute syntax df.x = col
PR #3147 DataFrame can be initialized from rows via list of tuples
PR #3539 Restrict CuPy to 6

Bug Fixes

PR #2584 ORC Reader: fix parsing of DECIMAL index positions
PR #2619 Fix groupby serialization/deserialization
PR #2614 Update Java version to match
PR #2601 Fixes nlargest(1) issue in Series and Dataframe
PR #2610 Fix a bug in index serialization (properly pass DeviceNDArray)
PR #2621 Fixes the floordiv issue of not promoting float type when rhs is 0
PR #2611 Types Test: fix static casting from negative int to string
PR #2618 IO Readers: Fix datasource memory map failure for multiple reads
PR #2628 groupby_without_aggregation non-nullable input table produces non-nullable output
PR #2615 fix string category partitioning in java API
PR #2641 fix string category and timeunit concat in the java API
PR #2649 Fix groupby issue resulting from column_empty bug
PR #2658 Fix astype() for null categorical columns
PR #2660 fix column string category and timeunit concat in the java API
PR #2664 ORC reader: fix skip_rows larger than first stripe
PR #2654 Allow Java gdfOrderBy to work with string categories
PR #2669 AVRO reader: fix non-deterministic output
PR #2668 Update Java bindings to specify timestamp units for ORC and Parquet readers
PR #2679 AVRO reader: fix cuda errors when decoding compressed streams
PR #2692 Add concatenation for data-frame with different headers (empty and non-empty)
PR #2651 Remove nvidia driver installation from ci/cpu/build.sh
PR #2697 Ensure csv reader sets datetime column time units
PR #2698 Return RangeIndex from contiguous slice of RangeIndex
PR #2672 Fix null and integer handling in round
PR #2704 Parquet Reader: Fix crash when loading string column with nulls
PR #2725 Fix Jitify issue with running on Turing using CUDA version < 10
PR #2731 Fix building of benchmarks
PR #2738 Fix java to find new NVStrings locations
PR #2736 Pin Jitify branch to v0.10 version
PR #2742 IO Readers: Fix possible silent failures when creating NvStrings instance
PR #2753 Fix java quantile API calls
PR #2762 Fix validity processing for time in java
PR #2796 Fix handling string slicing and other nvstrings delegated methods with dask
PR #2769 Fix link to API docs in README.md
PR #2772 Handle multiindex pandas Series #2772
PR #2749 Fix apply_rows/apply_chunks pessimistic null mask to use in_cols null masks only
PR #2752 CSV Reader: Fix exception when there's no rows to process
PR #2716 Added Exception for StringMethods in string methods
PR #2787 Fix Broadcasting None to cudf-series
PR #2794 Fix async race in NVCategory::get_value and get_value_bounds
PR #2795 Fix java build/cast error
PR #2496 Fix improper merge of two dataframes when names differ
PR #2824 Fix issue with incorrect result when Numeric Series replace is called several times
PR #2751 Replace value with null
PR #2765 Fix Java inequality comparisons for string category
PR #2818 Fix java join API to use new C++ join API
PR #2841 Fix nvstrings.slice and slice_from for range (0,0)
PR #2837 Fix join benchmark
PR #2809 Add hash_df and group_split dispatch functions for dask
PR #2843 Parquet reader: fix skip_rows when not aligned with page or row_group boundaries
PR #2851 Deleted existing dask-cudf/record.txt
PR #2854 Fix column creation from ephemeral objects exposing cuda_array_interface
PR #2860 Fix boolean indexing when the result is a single row
PR #2859 Fix tail method issue for string columns
PR #2852 Fixed cumsum() and cumprod() on boolean series.
PR #2865 DaskIO: Fix read_csv and read_orc when input is list of files
PR #2750 Fixed casting values to cudf::bool8 so non-zero values always cast to true
PR #2873 Fixed dask_cudf read_partition bug by generating ParquetDatasetPiece
PR #2850 Fixes dask_cudf.read_parquet on partitioned datasets
PR #2896 Properly handle axis string keywords in concat
PR #2926 Update rounding algorithm to avoid using fmod
PR #2968 Fix Java dependency loading when using NVTX
PR #2963 Fix ORC writer uncompressed block indexing
PR #2928 CSV Reader: Fix using byte_range for large datasets
PR #2983 Fix sm_70+ race condition in gpu_unsnap
PR #2964 ORC Writer: Segfault when writing mixed numeric and string columns
PR #3007 Java: Remove unit test that frees RMM invalid pointer
PR #3009 Fix orc reader RLEv2 patch position regression from PR #2507
PR #3002 Fix CUDA invalid configuration errors reported after loading an ORC file without data
PR #3035 Update update-version.sh for new docs locations
PR #3038 Fix uninitialized stream parameter in device_table deleter
PR #3064 Fixes groupby performance issue
PR #3061 Add rmmInitialize to nvstrings gtests
PR #3058 Fix UDF doc markdown formatting
PR #3059 Add nvstrings python build instructions to contributing.md

cuDF 0.9.0 (21 Aug 2019)

New Features

PR #1993 Add CUDA-accelerated series aggregations: mean, var, std
PR #2111 IO Readers: Support memory buffer, file-like object, and URL inputs
PR #2012 Add reindex() to DataFrame and Series
PR #2097 Add GPU-accelerated AVRO reader
PR #2098 Support binary ops on DFs and Series with mismatched indices
PR #2160 Merge dask-cudf codebase into cudf repo
PR #2149 CSV Reader: Add hex dtype for explicit hexadecimal parsing
PR #2156 Add upper_bound() and lower_bound() for libcudf tables and searchsorted() for cuDF Series
PR #2158 CSV Reader: Support single, non-list/dict argument for dtype
PR #2177 CSV Reader: Add parse_dates parameter for explicit date inference
PR #1744 cudf::apply_boolean_mask and cudf::drop_nulls support for cudf::table inputs (multi-column)
PR #2196 Add DataFrame.dropna()
PR #2197 CSV Writer: add chunksize parameter for to_csv
PR #2215 type_dispatcher benchmark
PR #2179 Add Java quantiles
PR #2157 Add array_function to DataFrame and Series
PR #2212 Java support for ORC reader
PR #2224 Add DataFrame isna, isnull, notna functions
PR #2236 Add Series.drop_duplicates
PR #2105 Add hash-based join benchmark
PR #2316 Add unique, nunique, and value_counts for datetime columns
PR #2337 Add Java support for slicing a ColumnVector
PR #2049 Add cudf::merge (sorted merge)
PR #2368 Full cudf+dask Parquet Support
PR #2380 New cudf::is_sorted checks whether cudf::table is sorted
PR #2356 Java column vector standard deviation support
PR #2221 MultiIndex full indexing - Support iloc and wildcards for loc
PR #2429 Java support for getting length of strings in a ColumnVector
PR #2415 Add value_counts for series of any type
PR #2446 Add array_function for index
PR #2437 ORC reader: Add 'use_np_dtypes' option
PR #2382 Add CategoricalAccessor add, remove, rename, and ordering methods
PR #2464 Native implement __cuda_array_interface__ for Series/Index/Column objects
PR #2425 Rolling window now accepts array-based user-defined functions
PR #2442 Add setitem
PR #2449 Java support for getting byte count of strings in a ColumnVector
PR #2492 Add groupby.size() method
PR #2358 Add cudf::nans_to_nulls: convert floating point column into bitmask
PR #2489 Add drop argument to set_index
PR #2491 Add Java bindings for ORC reader 'use_np_dtypes' option
PR #2213 Support s/ms/us/ns DatetimeColumn time unit resolutions
PR #2536 Add _constructor properties to Series and DataFrame

Improvements

PR #2103 Move old column and bitmask files into legacy/ directory
PR #2109 added name to Python column classes
PR #1947 Cleanup serialization code
PR #2125 More aggregate in java API
PR #2127 Add in java Scalar tests
PR #2088 Refactor of Python groupby code
PR #2130 Java serialization and deserialization of tables.
PR #2131 Chunk rows logic added to csv_writer
PR #2129 Add functions in the Java API to support nullable column filtering
PR #2165 made changes to get_dummies api for it to be available in MethodCache
PR #2171 Add CodeCov integration, fix doc version, make --skip-tests work when invoking with source
PR #2184 handle remote orc files for dask-cudf
PR #2186 Add getitem and getattr style access to Rolling objects
PR #2168 Use cudf.Column for CategoricalColumn's categories instead of a tuple
PR #2193 DOC: cudf::type_dispatcher documentation for specializing dispatched functors
PR #2199 Better java support for appending strings
PR #2176 Added column dtype support for datetime, int8, int16 to csv_writer
PR #2209 Matching get_dummies & select_dtypes behavior to pandas
PR #2217 Updated Java bindings to use the new groupby API
PR #2214 DOC: Update doc instructions to build/install cudf and dask-cudf
PR #2220 Update Java bindings for reduction rename
PR #2232 Move CodeCov upload from build script to Jenkins
PR #2225 refactor to use libcudf for gathering columns in dataframes
PR #2293 Improve join performance (faster compute_join_output_size)
PR #2300 Create separate dask codeowners for dask-cudf codebase
PR #2304 gdf_group_by_without_aggregations returns gdf_column
PR #2309 Java readers: remove redundant copy of result pointers
PR #2307 Add black and isort to style checker script
PR #2345 Restore removal of old groupby implementation
PR #2342 Improve astype() to operate all ways
PR #2329 using libcudf cudf::copy for column deep copy
PR #2344 DOC: docs on code formatting for contributors
PR #2376 Add inoperative axis= and win_type= arguments to Rolling()
PR #2378 remove dask for (de-)serialization of cudf objects
PR #2353 Bump Arrow and Dask versions
PR #2377 Replace standard_python_slice with just slice.indices()
PR #2373 cudf.DataFrame enchancements & Series.values support
PR #2392 Remove dlpack submodule; make cuDF's Cython API externally accessible
PR #2430 Updated Java bindings to use the new unary API
PR #2406 Moved all existing table related files to a legacy/ directory
PR #2350 Performance related changes to get_dummies
PR #2420 Remove cudautils.astype and replace with typecast.apply_cast
PR #2456 Small improvement to typecast utility
PR #2458 Fix handling of thirdparty packages in isort config
PR #2459 IO Readers: Consolidate all readers to use datasource class
PR #2475 Exposed type_dispatcher.hpp, nvcategory_util.hpp and wrapper_types.hpp in the include folder
PR #2484 Enabled building libcudf as a static library
PR #2453 Streamline CUDA_REL environment variable
PR #2483 Bundle Boost filesystem dependency in the Java jar
PR #2486 Java API hash functions
PR #2481 Adds the ignore_null_keys option to the java api
PR #2490 Java api: support multiple aggregates for the same column
PR #2510 Java api: uses table based apply_boolean_mask
PR #2432 Use pandas formatting for console, html, and latex output
PR #2573 Bump numba version to 0.45.1
PR #2606 Fix references to notebooks-contrib

Bug Fixes

PR #2086 Fixed quantile api behavior mismatch in series & dataframe
PR #2128 Add offset param to host buffer readers in java API.
PR #2145 Work around binops validity checks for java
PR #2146 Work around unary_math validity checks for java
PR #2151 Fixes bug in cudf::copy_range where null_count was invalid
PR #2139 matching to pandas describe behavior & fixing nan values issue
PR #2161 Implicitly convert unsigned to signed integer types in binops
PR #2154 CSV Reader: Fix bools misdetected as strings dtype
PR #2178 Fix bug in rolling bindings where a view of an ephemeral column was being taken
PR #2180 Fix issue with isort reordering importorskip below imports depending on them
PR #2187 fix to honor dtype when numpy arrays are passed to columnops.as_column
PR #2190 Fix issue in astype conversion of string column to 'str'
PR #2208 Fix issue with calling head() on one row dataframe
PR #2229 Propagate exceptions from Cython cdef functions
PR #2234 Fix issue with local build script not properly building
PR #2223 Fix CUDA invalid configuration errors reported after loading small compressed ORC files
PR #2162 Setting is_unique and is_monotonic-related attributes
PR #2244 Fix ORC RLEv2 delta mode decoding with nonzero residual delta width
PR #2297 Work around var/std unsupported only at debug build
PR #2302 Fixed java serialization corner case
PR #2355 Handle float16 in binary operations
PR #2311 Fix copy behaviour for GenericIndex
PR #2349 Fix issues with String filter in java API
PR #2323 Fix groupby on categoricals
PR #2328 Ensure order is preserved in CategoricalAccessor._set_categories
PR #2202 Fix issue with unary ops mishandling empty input
PR #2326 Fix for bug in DLPack when reading multiple columns
PR #2324 Fix cudf Docker build
PR #2325 Fix ORC RLEv2 patched base mode decoding with nonzero patch width
PR #2235 Fix get_dummies to be compatible with dask
PR #2332 Zero initialize gdf_dtype_extra_info
PR #2355 Handle float16 in binary operations
PR #2360 Fix missing dtype handling in cudf.Series & columnops.as_column
PR #2364 Fix quantile api and other trivial issues around it
PR #2361 Fixed issue with codes of CategoricalIndex
PR #2357 Fixed inconsistent type of index created with from_pandas vs direct construction
PR #2389 Fixed Rolling getattr and getitem for offset based windows
PR #2402 Fixed bug in valid mask computation in cudf::copy_if (apply_boolean_mask)
PR #2401 Fix to a scalar datetime(of type Days) issue
PR #2386 Correctly allocate output valids in groupby
PR #2411 Fixed failures on binary op on single element string column
PR #2422 Fix Pandas logical binary operation incompatibilites
PR #2447 Fix CodeCov posting build statuses temporarily
PR #2450 Fix erroneous null handling in cudf.DataFrame's apply_rows
PR #2470 Fix issues with empty strings and string categories (Java)
PR #2471 Fix String Column Validity.
PR #2481 Fix java validity buffer serialization
PR #2485 Updated bytes calculation to use size_t to avoid overflow in column concat
PR #2461 Fix groupby multiple aggregations same column
PR #2514 Fix cudf::drop_nulls threshold handling in Cython
PR #2516 Fix utilities include paths and meta.yaml header paths
PR #2517 Fix device memory leak in to_dlpack tensor deleter
PR #2431 Fix local build generated file ownerships
PR #2511 Added import of orc, refactored exception handlers to not squash fatal exceptions
PR #2527 Fix index and column input handling in dask_cudf read_parquet
PR #2466 Fix dataframe.query returning null rows erroneously
PR #2548 Orc reader: fix non-deterministic data decoding at chunk boundaries
PR #2557 fix cudautils import in string.py
PR #2521 Fix casting datetimes from/to the same resolution
PR #2545 Fix MultiIndexes with datetime levels
PR #2560 Remove duplicate dlpack definition in conda recipe
PR #2567 Fix ColumnVector.fromScalar issues while dealing with null scalars
PR #2565 Orc reader: fix incorrect data decoding of int64 data types
PR #2577 Fix search benchmark compilation error by adding necessary header
PR #2604 Fix a bug in copying.pyx:_normalize_types that upcasted int32 to int64

cuDF 0.8.0 (27 June 2019)

New Features

PR #1524 Add GPU-accelerated JSON Lines parser with limited feature set
PR #1569 Add support for Json objects to the JSON Lines reader
PR #1622 Add Series.loc
PR #1654 Add cudf::apply_boolean_mask: faster replacement for gdf_apply_stencil
PR #1487 cython gather/scatter
PR #1310 Implemented the slice/split functionality.
PR #1630 Add Python layer to the GPU-accelerated JSON reader
PR #1745 Add rounding of numeric columns via Numba
PR #1772 JSON reader: add support for BytesIO and StringIO input
PR #1527 Support GDF_BOOL8 in readers and writers
PR #1819 Logical operators (AND, OR, NOT) for libcudf and cuDF
PR #1813 ORC Reader: Add support for stripe selection
PR #1828 JSON Reader: add suport for bool8 columns
PR #1833 Add column iterator with/without nulls
PR #1665 Add the point-in-polygon GIS function
PR #1863 Series and Dataframe methods for all and any
PR #1908 cudf::copy_range and cudf::fill for copying/assigning an index or range to a constant
PR #1921 Add additional formats for typecasting to/from strings
PR #1807 Add Series.dropna()
PR #1987 Allow user defined functions in the form of ptx code to be passed to binops
PR #1948 Add operator functions like Series.add() to DataFrame and Series
PR #1954 Add skip test argument to GPU build script
PR #2018 Add bindings for new groupby C++ API
PR #1984 Add rolling window operations Series.rolling() and DataFrame.rolling()
PR #1542 Python method and bindings for to_csv
PR #1995 Add Java API
PR #1998 Add google benchmark to cudf
PR #1845 Add cudf::drop_duplicates, DataFrame.drop_duplicates
PR #1652 Added Series.where() feature
PR #2074 Java Aggregates, logical ops, and better RMM support
PR #2140 Add a cudf::transform function
PR #2068 Concatenation of different typed columns

Improvements

PR #1538 Replacing LesserRTTI with inequality_comparator
PR #1703 C++: Added non-aggregating insert to concurrent_unordered_map with specializations to store pairs with a single atomicCAS when possible.
PR #1422 C++: Added a RAII wrapper for CUDA streams
PR #1701 Added unique method for stringColumns
PR #1713 Add documentation for Dask-XGBoost
PR #1666 CSV Reader: Improve performance for files with large number of columns
PR #1725 Enable the ability to use a single column groupby as its own index
PR #1759 Add an example showing simultaneous rolling averages to apply_grouped documentation
PR #1746 C++: Remove unused code: windowed_ops.cu, sorting.cu, hash_ops.cu
PR #1748 C++: Add bool nullability flag to device_table row operators
PR #1764 Improve Numerical column: mean_var and mean
PR #1767 Speed up Python unit tests
PR #1770 Added build.sh script, updated CI scripts and documentation
PR #1739 ORC Reader: Add more pytest coverage
PR #1696 Added null support in Series.replace().
PR #1390 Added some basic utility functions for gdf_column's
PR #1791 Added general column comparison code for testing
PR #1795 Add printing of git submodule info to print_env.sh
PR #1796 Removing old sort based group by code and gdf_filter
PR #1811 Added funtions for copying/allocating cudf::tables
PR #1838 Improve columnops.column_empty so that it returns typed columns instead of a generic Column
PR #1890 Add utils.get_dummies- a pandas-like wrapper around one_hot-encoding
PR #1823 CSV Reader: default the column type to string for empty dataframes
PR #1827 Create bindings for scalar-vector binops, and update one_hot_encoding to use them
PR #1817 Operators now support different sized dataframes as long as they don't share different sized columns
PR #1855 Transition replace_nulls to new C++ API and update corresponding Cython/Python code
PR #1858 Add std::initializer_list constructor to column_wrapper
PR #1846 C++ type-erased gdf_equal_columns test util; fix gdf_equal_columns logic error
PR #1390 Added some basic utility functions for gdf_columns
PR #1391 Tidy up bit-resolution-operation and bitmask class code
PR #1882 Add iloc functionality to MultiIndex dataframes
PR #1884 Rolling windows: general enhancements and better coverage for unit tests
PR #1886 support GDF_STRING_CATEGORY columns in apply_boolean_mask, drop_nulls and other libcudf functions
PR #1896 Improve performance of groupby with levels specified in dask-cudf
PR #1915 Improve iloc performance for non-contiguous row selection
PR #1859 Convert read_json into a C++ API
PR #1919 Rename libcudf namespace gdf to namespace cudf
PR #1850 Support left_on and right_on for DataFrame merge operator
PR #1930 Specialize constructor for cudf::bool8 to cast argument to bool
PR #1938 Add default constructor for column_wrapper
PR #1930 Specialize constructor for cudf::bool8 to cast argument to bool
PR #1952 consolidate libcudf public API headers in include/cudf
PR #1949 Improved selection with boolmask using libcudf apply_boolean_mask
PR #1956 Add support for nulls in query()
PR #1973 Update std::tuple to std::pair in top-most libcudf APIs and C++ transition guide
PR #1981 Convert read_csv into a C++ API
PR #1868 ORC Reader: Support row index for speed up on small/medium datasets
PR #1964 Added support for list-like types in Series.str.cat
PR #2005 Use HTML5 details tag in bug report issue template
PR #2003 Removed few redundant unit-tests from test_string.py::test_string_cat
PR #1944 Groupby design improvements
PR #2017 Convert read_orc() into a C++ API
PR #2011 Convert read_parquet() into a C++ API
PR #1756 Add documentation "10 Minutes to cuDF and dask_cuDF"
PR #2034 Adding support for string columns concatenation using "add" binary operator
PR #2042 Replace old "10 Minutes" guide with new guide for docs build process
PR #2036 Make library of common test utils to speed up tests compilation
PR #2022 Facilitating get_dummies to be a high level api too
PR #2050 Namespace IO readers and add back free-form read_xxx functions
PR #2104 Add a functional sort= keyword argument to groupby
PR #2108 Add find_and_replace for StringColumn for replacing single values
PR #1803 cuDF/CuPy interoperability documentation

Bug Fixes

PR #1465 Fix for test_orc.py and test_sparse_df.py test failures
PR #1583 Fix underlying issue in as_index() that was causing Series.quantile() to fail
PR #1680 Add errors= keyword to drop() to fix cudf-dask bug
PR #1651 Fix query function on empty dataframe
PR #1616 Fix CategoricalColumn to access categories by index instead of iteration
PR #1660 Fix bug in loc when indexing with a column name (a string)
PR #1683 ORC reader: fix timestamp conversion to UTC
PR #1613 Improve CategoricalColumn.fillna(-1) performance
PR #1642 Fix failure of CSV_TEST gdf_csv_test.SkiprowsNrows on multiuser systems
PR #1709 Fix handling of datetime64[ms] in dataframe.select_dtypes
PR #1704 CSV Reader: Add support for the plus sign in number fields
PR #1687 CSV reader: return an empty dataframe for zero size input
PR #1757 Concatenating columns with null columns
PR #1755 Add col_level keyword argument to melt
PR #1758 Fix df.set_index() when setting index from an empty column
PR #1749 ORC reader: fix long strings of NULL values resulting in incorrect data
PR #1742 Parquet Reader: Fix index column name to match PANDAS compat
PR #1782 Update libcudf doc version
PR #1783 Update conda dependencies
PR #1786 Maintain the original series name in series.unique output
PR #1760 CSV Reader: fix segfault when dtype list only includes columns from usecols list
PR #1831 build.sh: Assuming python is in PATH instead of using PYTHON env var
PR #1839 Raise an error instead of segfaulting when transposing a DataFrame with StringColumns
PR #1840 Retain index correctly during merge left_on right_on
PR #1825 cuDF: Multiaggregation Groupby Failures
PR #1789 CSV Reader: Fix missing support for specifying int8 and int16 dtypes
PR #1857 Cython Bindings: Handle bool columns while calling column_view_from_NDArrays
PR #1849 Allow DataFrame support methods to pass arguments to the methods
PR #1847 Fixed #1375 by moving the nvstring check into the wrapper function
PR #1864 Fixing cudf reduction for POWER platform
PR #1869 Parquet reader: fix Dask timestamps not matching with Pandas (convert to milliseconds)
PR #1876 add dtype=bool for any, all to treat integer column correctly
PR #1875 CSV reader: take NaN values into account in dtype detection
PR #1873 Add column dtype checking for the all/any methods
PR #1902 Bug with string iteration in _apply_basic_agg
PR #1887 Fix for initialization issue in pq_read_arg,orc_read_arg
PR #1867 JSON reader: add support for null/empty fields, including the 'null' literal
PR #1891 Fix bug #1750 in string column comparison
PR #1909 Support of to_pandas() of boolean series with null values
PR #1923 Use prefix removal when two aggs are called on a SeriesGroupBy
PR #1914 Zero initialize gdf_column local variables
PR #1959 Add support for comparing boolean Series to scalar
PR #1966 Ignore index fix in series append
PR #1967 Compute index sizeof only once for DataFrame sizeof
PR #1977 Support CUDA installation in default system directories
PR #1982 Fixes incorrect index name after join operation
PR #1985 Implement GDF_PYMOD, a special modulo that follows python's sign rules
PR #1991 Parquet reader: fix decoding of NULLs
PR #1990 Fixes a rendering bug in the apply_grouped documentation
PR #1978 Fix for values being filled in an empty dataframe
PR #2001 Correctly create MultiColumn from Pandas MultiColumn
PR #2006 Handle empty dataframe groupby construction for dask
PR #1965 Parquet Reader: Fix duplicate index column when it's already in use_cols
PR #2033 Add pip to conda environment files to fix warning
PR #2028 CSV Reader: Fix reading of uncompressed files without a recognized file extension
PR #2073 Fix an issue when gathering columns with NVCategory and nulls
PR #2053 cudf::apply_boolean_mask return empty column for empty boolean mask
PR #2066 exclude IteratorTest.mean_var_output test from debug build
PR #2069 Fix JNI code to use read_csv and read_parquet APIs
PR #2071 Fix bug with unfound transitive dependencies for GTests in Ubuntu 18.04
PR #2089 Configure Sphinx to render params correctly
PR #2091 Fix another bug with unfound transitive dependencies for cudftestutils in Ubuntu 18.04
PR #2115 Just apply --disable-new-dtags instead of trying to define all the transitive dependencies
PR #2106 Fix errors in JitCache tests caused by sharing of device memory between processes
PR #2120 Fix errors in JitCache tests caused by running multiple threads on the same data
PR #2102 Fix memory leak in groupby
PR #2113 fixed typo in to_csv code example

cudf 0.7.2 (16 May 2019)

New Features

PR #1735 Added overload for atomicAdd on int64. Streamlined implementation of custom atomic overloads.
PR #1741 Add MultiIndex concatenation

Bug Fixes

PR #1718 Fix issue with SeriesGroupBy MultiIndex in dask-cudf
PR #1734 Python: fix performance regression for groupby count() aggregations
PR #1768 Cython: fix handling read only schema buffers in gpuarrow reader

cudf 0.7.1 (11 May 2019)

New Features

PR #1702 Lazy load MultiIndex to return groupby performance to near optimal.

Bug Fixes

PR #1708 Fix handling of datetime64[ms] in dataframe.select_dtypes

cuDF 0.7.0 (10 May 2019)

New Features

PR #982 Implement gdf_group_by_without_aggregations and gdf_unique_indices functions
PR #1142 Add GDF_BOOL column type
PR #1194 Implement overloads for CUDA atomic operations
PR #1292 Implemented Bitwise binary ops AND, OR, XOR (&, |, ^)
PR #1235 Add GPU-accelerated Parquet Reader
PR #1335 Added local_dict arg in DataFrame.query().
PR #1282 Add Series and DataFrame.describe()
PR #1356 Rolling windows
PR #1381 Add DataFrame._get_numeric_data
PR #1388 Add CODEOWNERS file to auto-request reviews based on where changes are made
PR #1396 Add DataFrame.drop method
PR #1413 Add DataFrame.melt method
PR #1412 Add DataFrame.pop()
PR #1419 Initial CSV writer function
PR #1441 Add Series level cumulative ops (cumsum, cummin, cummax, cumprod)
PR #1420 Add script to build and test on a local gpuCI image
PR #1440 Add DatetimeColumn.min(), DatetimeColumn.max()
PR #1455 Add Series.Shift via Numba kernel
PR #1441 Add Series level cumulative ops (cumsum, cummin, cummax, cumprod)
PR #1461 Add Python coverage test to gpu build
PR #1445 Parquet Reader: Add selective reading of rows and row group
PR #1532 Parquet Reader: Add support for INT96 timestamps
PR #1516 Add Series and DataFrame.ndim
PR #1556 Add libcudf C++ transition guide
PR #1466 Add GPU-accelerated ORC Reader
PR #1565 Add build script for nightly doc builds
PR #1508 Add Series isna, isnull, and notna
PR #1456 Add Series.diff() via Numba kernel
PR #1588 Add Index astype typecasting
PR #1301 MultiIndex support
PR #1599 Level keyword supported in groupby
PR #929 Add support operations to dataframe
PR #1609 Groupby accept list of Series
PR #1658 Support group_keys=True keyword in groupby method

Improvements

PR #1531 Refactor closures as private functions in gpuarrow
PR #1404 Parquet reader page data decoding speedup
PR #1076 Use type_dispatcher in join, quantiles, filter, segmented sort, radix sort and hash_groupby
PR #1202 Simplify README.md
PR #1149 CSV Reader: Change convertStrToValue() functions to __device__ only
PR #1238 Improve performance of the CUDA trie used in the CSV reader
PR #1245 Use file cache for JIT kernels
PR #1278 Update CONTRIBUTING for new conda environment yml naming conventions
PR #1163 Refactored UnaryOps. Reduced API to two functions: gdf_unary_math and gdf_cast. Added abs, -, and ~ ops. Changed bindings to Cython
PR #1284 Update docs version
PR #1287 add exclude argument to cudf.select_dtype function
PR #1286 Refactor some of the CSV Reader kernels into generic utility functions
PR #1291 fillna in Series.to_gpu_array() and Series.to_array() can accept the scalar too now.
PR #1005 generic reduction and scan support
PR #1349 Replace modernGPU sort join with thrust.
PR #1363 Add a dataframe.mean(...) that raises NotImplementedError to satisfy dask.dataframe.utils.is_dataframe_like
PR #1319 CSV Reader: Use column wrapper for gdf_column output alloc/dealloc
PR #1376 Change series quantile default to linear
PR #1399 Replace CFFI bindings for NVTX functions with Cython bindings
PR #1389 Refactored set_null_count()
PR #1386 Added macros GDF_TRY(), CUDF_TRY() and ASSERT_CUDF_SUCCEEDED()
PR #1435 Rework CMake and conda recipes to depend on installed libraries
PR #1391 Tidy up bit-resolution-operation and bitmask class code
PR #1439 Add cmake variable to enable compiling CUDA code with -lineinfo
PR #1462 Add ability to read parquet files from arrow::io::RandomAccessFile
PR #1453 Convert CSV Reader CFFI to Cython
PR #1479 Convert Parquet Reader CFFI to Cython
PR #1397 Add a utility function for producing an overflow-safe kernel launch grid configuration
PR #1382 Add GPU parsing of nested brackets to cuIO parsing utilities
PR #1481 Add cudf::table constructor to allocate a set of gdf_columns
PR #1484 Convert GroupBy CFFI to Cython
PR #1463 Allow and default melt keyword argument var_name to be None
PR #1486 Parquet Reader: Use device_buffer rather than device_ptr
PR #1525 Add cudatoolkit conda dependency
PR #1520 Renamed src/dataframe to src/table and moved table.hpp. Made types.hpp to be type declarations only.
PR #1492 Convert transpose CFFI to Cython
PR #1495 Convert binary and unary ops CFFI to Cython
PR #1503 Convert sorting and hashing ops CFFI to Cython
PR #1522 Use latest release version in update-version CI script
PR #1533 Remove stale join CFFI, fix memory leaks in join Cython
PR #1521 Added row_bitmask to compute bitmask for rows of a table. Merged valids_ops.cu and bitmask_ops.cu
PR #1553 Overload hash_row to avoid using intial hash values. Updated gdf_hash to select between overloads
PR #1585 Updated cudf::table to maintain own copy of wrapped gdf_column*s
PR #1559 Add except + to all Cython function definitions to catch C++ exceptions properly
PR #1617 has_nulls and column_dtypes for cudf::table
PR #1590 Remove CFFI from the build / install process entirely
PR #1536 Convert gpuarrow CFFI to Cython
PR #1655 Add Column._pointer as a way to access underlying gdf_column* of a Column
PR #1655 Update readme conda install instructions for cudf version 0.6 and 0.7

Bug Fixes

PR #1233 Fix dtypes issue while adding the column to str dataframe.
PR #1254 CSV Reader: fix data type detection for floating-point numbers in scientific notation
PR #1289 Fix looping over each value instead of each category in concatenation
PR #1293 Fix Inaccurate error message in join.pyx
PR #1308 Add atomicCAS overload for int8_t, int16_t
PR #1317 Fix catch polymorphic exception by reference in ipc.cu
PR #1325 Fix dtype of null bitmasks to int8
PR #1326 Update build documentation to use -DCMAKE_CXX11_ABI=ON
PR #1334 Add "na_position" argument to CategoricalColumn sort_by_values
PR #1321 Fix out of bounds warning when checking Bzip2 header
PR #1359 Add atomicAnd/Or/Xor for integers
PR #1354 Fix fillna() behaviour when replacing values with different dtypes
PR #1347 Fixed core dump issue while passing dict_dtypes without column names in cudf.read_csv()
PR #1379 Fixed build failure caused due to error: 'col_dtype' may be used uninitialized
PR #1392 Update cudf Dockerfile and package_versions.sh
PR #1385 Added INT8 type to _schema_to_dtype for use in GpuArrowReader
PR #1393 Fixed a bug in gdf_count_nonzero_mask() for the case of 0 bits to count
PR #1395 Update CONTRIBUTING to use the environment variable CUDF_HOME
PR #1416 Fix bug at gdf_quantile_exact and gdf_quantile_appox
PR #1421 Fix remove creation of series multiple times during add_column()
PR #1405 CSV Reader: Fix memory leaks on read_csv() failure
PR #1328 Fix CategoricalColumn to_arrow() null mask
PR #1433 Fix NVStrings/categories includes
PR #1432 Update NVStrings to 0.7.* to coincide with 0.7 development
PR #1483 Modify CSV reader to avoid cropping blank quoted characters in non-string fields
PR #1446 Merge 1275 hotfix from master into branch-0.7
PR #1447 Fix legacy groupby apply docstring
PR #1451 Fix hash join estimated result size is not correct
PR #1454 Fix local build script improperly change directory permissions
PR #1490 Require Dask 1.1.0+ for is_dataframe_like test or skip otherwise.
PR #1491 Use more specific directories & groups in CODEOWNERS
PR #1497 Fix Thrust issue on CentOS caused by missing default constructor of host_vector elements
PR #1498 Add missing include guard to device_atomics.cuh and separated DEVICE_ATOMICS_TEST
PR #1506 Fix csv-write call to updated NVStrings method
PR #1510 Added nvstrings fillna() function
PR #1507 Parquet Reader: Default string data to GDF_STRING
PR #1535 Fix doc issue to ensure correct labelling of cudf.series
PR #1537 Fix undefined reference link error in HashPartitionTest
PR #1548 Fix ci/local/build.sh README from using an incorrect image example
PR #1551 CSV Reader: Fix integer column name indexing
PR #1586 Fix broken scalar_wrapper::operator==
PR #1591 ORC/Parquet Reader: Fix missing import for FileNotFoundError exception
PR #1573 Parquet Reader: Fix crash due to clash with ORC reader datasource
PR #1607 Revert change of column.to_dense_buffer always return by copy for performance concerns
PR #1618 ORC reader: fix assert & data output when nrows/skiprows isn't aligned to stripe boundaries
PR #1631 Fix failure of TYPES_TEST on some gcc-7 based systems.
PR #1641 CSV Reader: Fix skip_blank_lines behavior with Windows line terminators (\r\n)
PR #1648 ORC reader: fix non-deterministic output when skiprows is non-zero
PR #1676 Fix groupby as_index behaviour with MultiIndex
PR #1659 Fix bug caused by empty groupbys and multiindex slicing throwing exceptions
PR #1656 Correct Groupby failure in dask when un-aggregable columns are left in dataframe.
PR #1689 Fix groupby performance regression
PR #1694 Add Cython as a runtime dependency since it's required in setup.py

cuDF 0.6.1 (25 Mar 2019)

Bug Fixes

PR #1275 Fix CentOS exception in DataFrame.hash_partition from using value "returned" by a void function

cuDF 0.6.0 (22 Mar 2019)

New Features

PR #760 Raise FileNotFoundError instead of GDF_FILE_ERROR in read_csv if the file does not exist
PR #539 Add Python bindings for replace function
PR #823 Add Doxygen configuration to enable building HTML documentation for libcudf C/C++ API
PR #807 CSV Reader: Add byte_range parameter to specify the range in the input file to be read
PR #857 Add Tail method for Series/DataFrame and update Head method to use iloc
PR #858 Add series feature hashing support
PR #871 CSV Reader: Add support for NA values, including user specified strings
PR #893 Adds PyArrow based parquet readers / writers to Python, fix category dtype handling, fix arrow ingest buffer size issues
PR #867 CSV Reader: Add support for ignoring blank lines and comment lines
PR #887 Add Series digitize method
PR #895 Add Series groupby
PR #898 Add DataFrame.groupby(level=0) support
PR #920 Add feather, JSON, HDF5 readers / writers from PyArrow / Pandas
PR #888 CSV Reader: Add prefix parameter for column names, used when parsing without a header
PR #913 Add DLPack support: convert between cuDF DataFrame and DLTensor
PR #939 Add ORC reader from PyArrow
PR #918 Add Series.groupby(level=0) support
PR #906 Add binary and comparison ops to DataFrame
PR #958 Support unary and binary ops on indexes
PR #964 Add rename method to DataFrame, Series, and Index
PR #985 Add Series.to_frame method
PR #985 Add drop= keyword to reset_index method
PR #994 Remove references to pygdf
PR #990 Add external series groupby support
PR #988 Add top-level merge function to cuDF
PR #992 Add comparison binaryops to DateTime columns
PR #996 Replace relative path imports with absolute paths in tests
PR #995 CSV Reader: Add index_col parameter to specify the column name or index to be used as row labels
PR #1004 Add from_gpu_matrix method to DataFrame
PR #997 Add property index setter
PR #1007 Replace relative path imports with absolute paths in cudf
PR #1013 select columns with df.columns
PR #1016 Rename Series.unique_count() to nunique() to match pandas API
PR #947 Prefixsum to handle nulls and float types
PR #1029 Remove rest of relative path imports
PR #1021 Add filtered selection with assignment for Dataframes
PR #872 Adding NVCategory support to cudf apis
PR #1052 Add left/right_index and left/right_on keywords to merge
PR #1091 Add indicator= and suffixes= keywords to merge
PR #1107 Add unsupported keywords to Series.fillna
PR #1032 Add string support to cuDF python
PR #1136 Removed gdf_concat
PR #1153 Added function for getting the padded allocation size for valid bitmask
PR #1148 Add cudf.sqrt for dataframes and Series
PR #1159 Add Python bindings for libcudf dlpack functions
PR #1155 Add array_ufunc for DataFrame and Series for sqrt
PR #1168 to_frame for series accepts a name argument

Improvements

PR #1218 Add dask-cudf page to API docs
PR #892 Add support for heterogeneous types in binary ops with JIT
PR #730 Improve performance of gdf_table constructor
PR #561 Add Doxygen style comments to Join CUDA functions
PR #813 unified libcudf API functions by replacing gpu_ with gdf_
PR #822 Add support for __cuda_array_interface__ for ingest
PR #756 Consolidate common helper functions from unordered map and multimap
PR #753 Improve performance of groupby sum and average, especially for cases with few groups.
PR #836 Add ingest support for arrow chunked arrays in Column, Series, DataFrame creation
PR #763 Format doxygen comments for csv_read_arg struct
PR #532 CSV Reader: Use type dispatcher instead of switch block
PR #694 Unit test utilities improvements
PR #878 Add better indexing to Groupby
PR #554 Add empty method and is_monotonic attribute to Index
PR #1040 Fixed up Doxygen comment tags
PR #909 CSV Reader: Avoid host->device->host copy for header row data
PR #916 Improved unit testing and error checking for gdf_column_concat
PR #941 Replace numpy call in Series.hash_encode with numba
PR #942 Added increment/decrement operators for wrapper types
PR #943 Updated count_nonzero_mask to return num_rows when the mask is null
PR #952 Added trait to map C++ type to gdf_dtype
PR #966 Updated RMM submodule.
PR #998 Add IO reader/writer modules to API docs, fix for missing cudf.Series docs
PR #1017 concatenate along columns for Series and DataFrames
PR #1002 Support indexing a dataframe with another boolean dataframe
PR #1018 Better concatenation for Series and Dataframes
PR #1036 Use Numpydoc style docstrings
PR #1047 Adding gdf_dtype_extra_info to gdf_column_view_augmented
PR #1054 Added default ctor to SerialTrieNode to overcome Thrust issue in CentOS7 + CUDA10
PR #1024 CSV Reader: Add support for hexadecimal integers in integral-type columns
PR #1033 Update fillna() to use libcudf function gdf_replace_nulls
PR #1066 Added inplace assignment for columns and select_dtypes for dataframes
PR #1026 CSV Reader: Change the meaning and type of the quoting parameter to match Pandas
PR #1100 Adds CUDF_EXPECTS error-checking macro
PR #1092 Fix select_dtype docstring
PR #1111 Added cudf::table
PR #1108 Sorting for datetime columns
PR #1120 Return a Series (not a Column) from Series.cat.set_categories()
PR #1128 CSV Reader: The last data row does not need to be line terminated
PR #1183 Bump Arrow version to 0.12.1
PR #1208 Default to CXX11_ABI=ON
PR #1252 Fix NVStrings dependencies for cuda 9.2 and 10.0
PR #2037 Optimize the existing gather and scatter routines in libcudf

Bug Fixes

PR #821 Fix flake8 issues revealed by flake8 update
PR #808 Resolved renamed d_columns_valids variable name
PR #820 CSV Reader: fix the issue where reader adds additional rows when file uses \r\n as a line terminator
PR #780 CSV Reader: Fix scientific notation parsing and null values for empty quotes
PR #815 CSV Reader: Fix data parsing when tabs are present in the input CSV file
PR #850 Fix bug where left joins where the left df has 0 rows causes a crash
PR #861 Fix memory leak by preserving the boolean mask index
PR #875 Handle unnamed indexes in to/from arrow functions
PR #877 Fix ingest of 1 row arrow tables in from arrow function
PR #876 Added missing <type_traits> include
PR #889 Deleted test_rmm.py which has now moved to RMM repo
PR #866 Merge v0.5.1 numpy ABI hotfix into 0.6
PR #917 value_counts return int type on empty columns
PR #611 Renamed gdf_reduce_optimal_output_size() -> gdf_reduction_get_intermediate_output_size()
PR #923 fix index for negative slicing for cudf dataframe and series
PR #927 CSV Reader: Fix category GDF_CATEGORY hashes not being computed properly
PR #921 CSV Reader: Fix parsing errors with delim_whitespace, quotations in the header row, unnamed columns
PR #933 Fix handling objects of all nulls in series creation
PR #940 CSV Reader: Fix an issue where the last data row is missing when using byte_range
PR #945 CSV Reader: Fix incorrect datetime64 when milliseconds or space separator are used
PR #959 Groupby: Problem with column name lookup
PR #950 Converting dataframe/recarry with non-contiguous arrays
PR #963 CSV Reader: Fix another issue with missing data rows when using byte_range
PR #999 Fix 0 sized kernel launches and empty sort_index exception
PR #993 Fix dtype in selecting 0 rows from objects
PR #1009 Fix performance regression in to_pandas method on DataFrame
PR #1008 Remove custom dask communication approach
PR #1001 CSV Reader: Fix a memory access error when reading a large (>2GB) file with date columns
PR #1019 Binary Ops: Fix error when one input column has null mask but other doesn't
PR #1014 CSV Reader: Fix false positives in bool value detection
PR #1034 CSV Reader: Fix parsing floating point precision and leading zero exponents
PR #1044 CSV Reader: Fix a segfault when byte range aligns with a page
PR #1058 Added support for DataFrame.loc[scalar]
PR #1060 Fix column creation with all valid nan values
PR #1073 CSV Reader: Fix an issue where a column name includes the return character
PR #1090 Updating Doxygen Comments
PR #1080 Fix dtypes returned from loc / iloc because of lists
PR #1102 CSV Reader: Minor fixes and memory usage improvements
PR #1174: Fix release script typo
PR #1137 Add prebuild script for CI
PR #1118 Enhanced the DataFrame.from_records() feature
PR #1129 Fix join performance with index parameter from using numpy array
PR #1145 Issue with .agg call on multi-column dataframes
PR #908 Some testing code cleanup
PR #1167 Fix issue with null_count not being set after inplace fillna()
PR #1184 Fix iloc performance regression
PR #1185 Support left_on/right_on and also on=str in merge
PR #1200 Fix allocating bitmasks with numba instead of rmm in allocate_mask function
PR #1213 Fix bug with csv reader requesting subset of columns using wrong datatype
PR #1223 gpuCI: Fix label on rapidsai channel on gpu build scripts
PR #1242 Add explicit Thrust exec policy to fix NVCATEGORY_TEST segfault on some platforms
PR #1246 Fix categorical tests that failed due to bad implicit type conversion
PR #1255 Fix overwriting conda package main label uploads
PR #1259 Add dlpack includes to pip build

cuDF 0.5.1 (05 Feb 2019)

Bug Fixes

PR #842 Avoid using numpy via cimport to prevent ABI issues in Cython compilation

cuDF 0.5.0 (28 Jan 2019)

New Features

PR #722 Add bzip2 decompression support to read_csv()
PR #693 add ZLIB-based GZIP/ZIP support to read_csv_strings()
PR #411 added null support to gdf_order_by (new API) and cudf_table::sort
PR #525 Added GitHub Issue templates for bugs, documentation, new features, and questions
PR #501 CSV Reader: Add support for user-specified decimal point and thousands separator to read_csv_strings()
PR #455 CSV Reader: Add support for user-specified decimal point and thousands separator to read_csv()
PR #439 add DataFrame.drop method similar to pandas
PR #356 add DataFrame.transpose method and DataFrame.T property similar to pandas
PR #505 CSV Reader: Add support for user-specified boolean values
PR #350 Implemented Series replace function
PR #490 Added print_env.sh script to gather relevant environment details when reporting cuDF issues
PR #474 add ZLIB-based GZIP/ZIP support to read_csv()
PR #547 Added melt similar to pandas.melt()
PR #491 Add CI test script to check for updates to CHANGELOG.md in PRs
PR #550 Add CI test script to check for style issues in PRs
PR #558 Add CI scripts for cpu-based conda and gpu-based test builds
PR #524 Add Boolean Indexing
PR #564 Update python sort_values method to use updated libcudf gdf_order_by API
PR #509 CSV Reader: Input CSV file can now be passed in as a text or a binary buffer
PR #607 Add __iter__ and iteritems to DataFrame class
PR #643 added a new api gdf_replace_nulls that allows a user to replace nulls in a column

Improvements

PR #426 Removed sort-based groupby and refactored existing groupby APIs. Also improves C++/CUDA compile time.
PR #461 Add CUDF_HOME variable in README.md to replace relative pathing.
PR #472 RMM: Created centralized rmm::device_vector alias and rmm::exec_policy
PR #500 Improved the concurrent hash map class to support partitioned (multi-pass) hash table building.
PR #454 Improve CSV reader docs and examples
PR #465 Added templated C++ API for RMM to avoid explicit cast to void**
PR #513 .gitignore tweaks
PR #521 Add assert_eq function for testing
PR #502 Simplify Dockerfile for local dev, eliminate old conda/pip envs
PR #549 Adds -rdynamic compiler flag to nvcc for Debug builds
PR #472 RMM: Created centralized rmm::device_vector alias and rmm::exec_policy
PR #577 Added external C++ API for scatter/gather functions
PR #500 Improved the concurrent hash map class to support partitioned (multi-pass) hash table building
PR #583 Updated gdf_size_type to int
PR #500 Improved the concurrent hash map class to support partitioned (multi-pass) hash table building
PR #617 Added .dockerignore file. Prevents adding stale cmake cache files to the docker container
PR #658 Reduced JOIN_TEST time by isolating overflow test of hash table size computation
PR #664 Added Debuging instructions to README
PR #651 Remove noqa marks in __init__.py files
PR #671 CSV Reader: uncompressed buffer input can be parsed without explicitly specifying compression as None
PR #684 Make RMM a submodule
PR #718 Ensure sum, product, min, max methods pandas compatibility on empty datasets
PR #720 Refactored Index classes to make them more Pandas-like, added CategoricalIndex
PR #749 Improve to_arrow and from_arrow Pandas compatibility
PR #766 Remove TravisCI references, remove unused variables from CMake, fix ARROW_VERSION in Cmake
PR #773 Add build-args back to Dockerfile and handle dependencies based on environment yml file
PR #781 Move thirdparty submodules to root and symlink in /cpp
PR #843 Fix broken cudf/python API examples, add new methods to the API index

Bug Fixes

PR #569 CSV Reader: Fix days being off-by-one when parsing some dates
PR #531 CSV Reader: Fix incorrect parsing of quoted numbers
PR #465 Added templated C++ API for RMM to avoid explicit cast to void**
PR #473 Added missing include
PR #478 CSV Reader: Add api support for auto column detection, header, mangle_dupe_cols, usecols
PR #495 Updated README to correct where cffi pytest should be executed
PR #501 Fix the intermittent segfault caused by the thousands and compression parameters in the csv reader
PR #502 Simplify Dockerfile for local dev, eliminate old conda/pip envs
PR #512 fix bug for on parameter in DataFrame.merge to allow for None or single column name
PR #511 Updated python/cudf/bindings/join.pyx to fix cudf merge printing out dtypes
PR #513 .gitignore tweaks
PR #521 Add assert_eq function for testing
PR #537 Fix CMAKE_CUDA_STANDARD_REQURIED typo in CMakeLists.txt
PR #447 Fix silent failure in initializing DataFrame from generator
PR #545 Temporarily disable csv reader thousands test to prevent segfault (test re-enabled in PR #501)
PR #559 Fix Assertion error while using applymap to change the output dtype
PR #575 Update print_env.sh script to better handle missing commands
PR #612 Prevent an exception from occuring with true division on integer series.
PR #630 Fix deprecation warning for pd.core.common.is_categorical_dtype
PR #622 Fix Series.append() behaviour when appending values with different numeric dtype
PR #603 Fix error while creating an empty column using None.
PR #673 Fix array of strings not being caught in from_pandas
PR #644 Fix return type and column support of dataframe.quantile()
PR #634 Fix create DataFrame.from_pandas() with numeric column names
PR #654 Add resolution check for GDF_TIMESTAMP in Join
PR #648 Enforce one-to-one copy required when using numba>=0.42.0
PR #645 Fix cmake build type handling not setting debug options when CMAKE_BUILD_TYPE=="Debug"
PR #669 Fix GIL deadlock when launching multiple python threads that make Cython calls
PR #665 Reworked the hash map to add a way to report the destination partition for a key
PR #670 CMAKE: Fix env include path taking precedence over libcudf source headers
PR #674 Check for gdf supported column types
PR #677 Fix 'gdf_csv_test_Dates' gtest failure due to missing nrows parameter
PR #604 Fix the parsing errors while reading a csv file using sep instead of delimiter.
PR #686 Fix converting nulls to NaT values when converting Series to Pandas/Numpy
PR #689 CSV Reader: Fix behavior with skiprows+header to match pandas implementation
PR #691 Fixes Join on empty input DFs
PR #706 CSV Reader: Fix broken dtype inference when whitespace is in data
PR #717 CSV reader: fix behavior when parsing a csv file with no data rows
PR #724 CSV Reader: fix build issue due to parameter type mismatch in a std::max call
PR #734 Prevents reading undefined memory in gpu_expand_mask_bits numba kernel
PR #747 CSV Reader: fix an issue where CUDA allocations fail with some large input files
PR #750 Fix race condition for handling NVStrings in CMake
PR #719 Fix merge column ordering
PR #770 Fix issue where RMM submodule pointed to wrong branch and pin other to correct branches
PR #778 Fix hard coded ABI off setting
PR #784 Update RMM submodule commit-ish and pip paths
PR #794 Update rmm::exec_policy usage to fix segmentation faults when used as temprory allocator.
PR #800 Point git submodules to branches of forks instead of exact commits

cuDF 0.4.0 (05 Dec 2018)

New Features

PR #398 add pandas-compatible DataFrame.shape() and Series.shape()
PR #394 New documentation feature "10 Minutes to cuDF"
PR #361 CSV Reader: Add support for strings with delimiters

Improvements

PR #436 Improvements for type_dispatcher and wrapper structs
PR #429 Add CHANGELOG.md (this file)
PR #266 use faster CUDA-accelerated DataFrame column/Series concatenation.
PR #379 new C++ type_dispatcher reduces code complexity in supporting many data types.
PR #349 Improve performance for creating columns from memoryview objects
PR #445 Update reductions to use type_dispatcher. Adds integer types support to sum_of_squares.
PR #448 Improve installation instructions in README.md
PR #456 Change default CMake build to Release, and added option for disabling compilation of tests

Bug Fixes

PR #444 Fix csv_test CUDA too many resources requested fail.
PR #396 added missing output buffer in validity tests for groupbys.
PR #408 Dockerfile updates for source reorganization
PR #437 Add cffi to Dockerfile conda env, fixes "cannot import name 'librmm'"
PR #417 Fix map_test failure with CUDA 10
PR #414 Fix CMake installation include file paths
PR #418 Properly cast string dtypes to programmatic dtypes when instantiating columns
PR #427 Fix and tests for Concatenation illegal memory access with nulls

cuDF 0.3.0 (23 Nov 2018)

New Features

PR #336 CSV Reader string support

Improvements

PR #354 source code refactored for better organization. CMake build system overhaul. Beginning of transition to Cython bindings.
PR #290 Add support for typecasting to/from datetime dtype
PR #323 Add handling pyarrow boolean arrays in input/out, add tests
PR #325 GDF_VALIDITY_UNSUPPORTED now returned for algorithms that don't support non-empty valid bitmasks
PR #381 Faster InputTooLarge Join test completes in ms rather than minutes.
PR #373 .gitignore improvements
PR #367 Doc cleanup & examples for DataFrame methods
PR #333 Add Rapids Memory Manager documentation
PR #321 Rapids Memory Manager adds file/line location logging and convenience macros
PR #334 Implement DataFrame __copy__ and __deepcopy__
PR #271 Add NVTX ranges to pygdf
PR #311 Document system requirements for conda install

Bug Fixes

PR #337 Retain index on scale() function
PR #344 Fix test failure due to PyArrow 0.11 Boolean handling
PR #364 Remove noexcept from managed_allocator; CMakeLists fix for NVstrings
PR #357 Fix bug that made all series be considered booleans for indexing
PR #351 replace conda env configuration for developers
PRs #346 #360 Fix CSV reading of negative numbers
PR #342 Fix CMake to use conda-installed nvstrings
PR #341 Preserve categorical dtype after groupby aggregations
PR #315 ReadTheDocs build update to fix missing libcuda.so
PR #320 FIX out-of-bounds access error in reductions.cu
PR #319 Fix out-of-bounds memory access in libcudf count_valid_bits
PR #303 Fix printing empty dataframe

cuDF 0.2.0 and cuDF 0.1.0

These were initial releases of cuDF based on previously separate pyGDF and libGDF libraries.

Files

CHANGELOG.md

Latest commit

History

CHANGELOG.md

File metadata and controls

cuDF 0.13.0 (Date TBD)

New Features

Improvements

Bug Fixes

cuDF 0.12.0 (04 Feb 2020)

New Features

Improvements

Bug Fixes

cuDF 0.11.0 (11 Dec 2019)

New Features

Improvements

Bug Fixes

cuDF 0.10.0 (16 Oct 2019)

New Features

Improvements

Bug Fixes

cuDF 0.9.0 (21 Aug 2019)

New Features

Improvements

Bug Fixes

cuDF 0.8.0 (27 June 2019)

New Features

Improvements

Bug Fixes

cudf 0.7.2 (16 May 2019)

New Features

Bug Fixes

cudf 0.7.1 (11 May 2019)

New Features

Bug Fixes

cuDF 0.7.0 (10 May 2019)

New Features

Improvements

Bug Fixes

cuDF 0.6.1 (25 Mar 2019)

Bug Fixes

cuDF 0.6.0 (22 Mar 2019)

New Features

Improvements

Bug Fixes

cuDF 0.5.1 (05 Feb 2019)

Bug Fixes

cuDF 0.5.0 (28 Jan 2019)

New Features

Improvements

Bug Fixes

cuDF 0.4.0 (05 Dec 2018)

New Features

Improvements

Bug Fixes

cuDF 0.3.0 (23 Nov 2018)

New Features

Improvements

Bug Fixes

cuDF 0.2.0 and cuDF 0.1.0