Add implementation of dpnp.histogram (IntelPython#1785)

* Implement dpnp.histogram

* Updated third party tests for histogram

* Updated histogram tests due to new dpnp.cumsum() impl

* Applied pre-commit checks

* Added dpnp tests

* Added CFD tests

* Renamed test_histogram.py

* Updated tests to run on Iris Xe

* Get rid of block size

* Addressed review comments

* Leftovers from rebase

* Cast bin edges to default floating type if density is enabled

.github/workflows/conda-package.yml

@@ -22,6 +22,7 @@ env:
       test_dparray.py
       test_copy.py
       test_fft.py
+      test_histogram.py
       test_linalg.py
       test_logic.py
       test_manipulation.py
@@ -49,6 +50,7 @@ env:
       third_party/cupy/math_tests
       third_party/cupy/sorting_tests/test_sort.py
       third_party/cupy/sorting_tests/test_count.py
+      third_party/cupy/statistics_tests/test_histogram.py
       third_party/cupy/statistics_tests/test_meanvar.py
   VER_JSON_NAME: 'version.json'
   VER_SCRIPT1: "import json; f = open('version.json', 'r'); j = json.load(f); f.close(); "

doc/reference/statistics.rst

@@ -27,13 +27,25 @@ Averages and variances
    dpnp.median
    dpnp.average
    dpnp.mean
-   dpnp.var
    dpnp.std
+   dpnp.var
    dpnp.nanmean
    dpnp.nanvar
    dpnp.nanstd
 
 
+Correlations
+------------
+
+.. autosummary::
+   :toctree: generated/
+   :nosignatures:
+
+   dpnp.corrcoef
+   dpnp.cov
+   dpnp.correlate
+
+
 Histograms
 ----------
 
@@ -47,15 +59,3 @@ Histograms
    dpnp.bincount
    dpnp.histogram_bin_edges
    dpnp.digitize
-
-
-Correlations
-------------
-
-.. autosummary::
-   :toctree: generated/
-   :nosignatures:
-
-   dpnp.corrcoef
-   dpnp.cov
-   dpnp.correlate

dpnp/dpnp_iface.py

@@ -78,6 +78,8 @@
 from dpnp.dpnp_iface_bitwise import __all__ as __all__bitwise
 from dpnp.dpnp_iface_counting import *
 from dpnp.dpnp_iface_counting import __all__ as __all__counting
+from dpnp.dpnp_iface_histograms import *
+from dpnp.dpnp_iface_histograms import __all__ as __all__histograms
 from dpnp.dpnp_iface_indexing import *
 from dpnp.dpnp_iface_indexing import __all__ as __all__indexing
 from dpnp.dpnp_iface_libmath import *
@@ -111,6 +113,7 @@
 __all__ += __all__arraycreation
 __all__ += __all__bitwise
 __all__ += __all__counting
+__all__ += __all__histograms
 __all__ += __all__indexing
 __all__ += __all__libmath
 __all__ += __all__linearalgebra