[release] v0.6.31

[yuanming-hu]

Related issue = #677

Highlights:

• Bug fixes
  • Use sys.getfilesystemencoding() to prevent possible locale errors ([Bug] [misc] Use sys.getfilesystemencoding() to prevent possible locale errors #1775) (by 彭于斌)
• C source backend
  • Support AdStack on C backend ([CC] [autodiff] Support AdStack on C backend #1752) (by 彭于斌)
• Documentation
  • Add how to set environment variables for fish users ([Doc] Add how to set environment variables for fish users #1800) (by Luyu Cheng)
  • Separate arithmetics.rst from syntax.rst and fill it with more details ([Doc] Separate arithmetics.rst from syntax.rst and fill it with more details #1761) (by 彭于斌)
• Examples
  • Fix stable_fluid.py boundary broken: int -> ti.floor, and make mpm3d.py 3x faster on CUDA ([Example] Fix stable_fluid.py boundary broken: int -> ti.floor, and make mpm3d.py 3x faster on CUDA #1784) (by 彭于斌)
• Language and syntax
  • Support formatted string with args in assert ([Lang] Support formatted string with args in assert #1806) (by Ye Kuang)
  • Support printing lists and tuples in Taichi-scope ([Lang] Support printing lists and tuples in Taichi-scope #1796) (by 彭于斌)
  • Add ti.get_rel_eps() for maximal relative error tolerance on current backend ([Lang] [test] Add ti.get_rel_eps() for maximal relative error tolerance on current backend #1798) (by Ye Kuang)
  • Support querying external array shape by 'x.shape' ([Lang] [ir] Support querying external array shape by 'x.shape' #1787) (by thinking-tower)
• IR optimization passes
  • Make irpass::replace_all_usages_with bottom-up ([Opt] Make irpass::replace_all_usages_with bottom-up #1789) (by xumingkuan)

Full changelog:

• [misc] Remove unused code/comments in transforms/simpilfy.cpp ([misc] Remove unused code/comments in transforms/simpilfy.cpp #1812) (by Yuanming Hu)
• [ir] Fix irpass::analysis::clone on TLS/BLS prologue/epilogue ([ir] Fix irpass::analysis::clone on TLS/BLS prologue/epilogue #1811) (by Yuanming Hu)
• [error] "Better error message when vector used as if's condition variable ([error] Better error message when vector used as if's condition variable #1804)" ([error] "Better error message when vector used as if's condition variable (#1804)" #1810) (by 彭于斌)
• [Lang] Support formatted string with args in assert ([Lang] Support formatted string with args in assert #1806) (by Ye Kuang)
• [refactor] Replace std::map with switch case statements in lang_util.cpp ([refactor] Replace std::map with switch case statements in lang_util.cpp #1755) (by Aryan Soman)
• [misc] Revert "Better error message when vector used as if's condition variable ([error] Better error message when vector used as if's condition variable #1804)" ([misc] Revert "Better error message when vector used as if's condition variable" (#1804) #1808) (by Yuanming Hu)
• [error] Better error message when vector used as if's condition variable ([error] Better error message when vector used as if's condition variable #1804) (by 彭于斌)
• [Opt] Make irpass::replace_all_usages_with bottom-up ([Opt] Make irpass::replace_all_usages_with bottom-up #1789) (by xumingkuan)
• [Doc] Add how to set environment variables for fish users ([Doc] Add how to set environment variables for fish users #1800) (by Luyu Cheng)
• [CC] [autodiff] Support AdStack on C backend ([CC] [autodiff] Support AdStack on C backend #1752) (by 彭于斌)
• [Lang] Support printing lists and tuples in Taichi-scope ([Lang] Support printing lists and tuples in Taichi-scope #1796) (by 彭于斌)
• [workflow] import missing package sys in code_format.py ([workflow] Import missing package sys in code_format.py #1802) (by Luyu Cheng)
• [cli] Add path to Python executable to 'ti diagnose' ([cli] Add path to Python executable to 'ti diagnose' #1801) (by Luyu Cheng)
• [refactor] Remove the singleton Program::context ([refactor] Remove the singleton Program::context #1799) (by Ye Kuang)
• [ir] Restore verification for OffloadedStmt ([ir] Restore verification for OffloadedStmt #1790) (by xumingkuan)
• [Lang] [test] Add ti.get_rel_eps() for maximal relative error tolerance on current backend ([Lang] [test] Add ti.get_rel_eps() for maximal relative error tolerance on current backend #1798) (by Ye Kuang)
• [Lang] [ir] Support querying external array shape by 'x.shape' ([Lang] [ir] Support querying external array shape by 'x.shape' #1787) (by thinking-tower)
• [workflow] Travis CI only test Python 3.6 unless release tag is used ([workflow] Travis CI only test Python 3.6 unless release tag is used #1793) (by 彭于斌)
• [refactor] Move Context to taichi/program ([refactor] Move Context to taichi/program #1788) (by Ye Kuang)
• [doc] Better clarify the difference between two profilers ([doc] Better clarify the difference between two profilers #1759) (by 彭于斌)
• [ir] [autodiff] Initialize ADStack with a zero ([ir] [autodiff] Initialize ADStack with a zero #1791) (by Yuanming Hu)
• [ir] [opt] Unify ifloordiv implementation over backends in demote_operations ([ir] [opt] Unify ifloordiv implementation over backends in demote_operations #1771) (by 彭于斌)
• [Bug] [misc] Use sys.getfilesystemencoding() to prevent possible locale errors ([Bug] [misc] Use sys.getfilesystemencoding() to prevent possible locale errors #1775) (by 彭于斌)
• [Example] Fix stable_fluid.py boundary broken: int -> ti.floor, and make mpm3d.py 3x faster on CUDA ([Example] Fix stable_fluid.py boundary broken: int -> ti.floor, and make mpm3d.py 3x faster on CUDA #1784) (by 彭于斌)
• [test] Expand the tolerance for testing on metal backend ([test] Expand the tolerance for testing on metal backend #1779) (by Xudong Feng)
• [opt] Simplify identical load elimination ([opt] Simplify identical load elimination #1782) (by xumingkuan)
• [error] [opengl] Better error message when int64 or sparse SNode not supported for OpenGL ([error] [opengl] Better error message when int64 or sparse SNode not supported for OpenGL #1783) (by 彭于斌)
• [Doc] Separate arithmetics.rst from syntax.rst and fill it with more details ([Doc] Separate arithmetics.rst from syntax.rst and fill it with more details #1761) (by 彭于斌)
• [ipython] Separate {Expr,Matrix}.{str,repr} to prevent unexpected materialization when repr ([ipython] Separate {Expr,Matrix}.{__str__,__repr__} to prevent unexpected materialization when repr #1766) (by 彭于斌)
• [async] Support constant folding in async mode ([async] Support constant folding in async mode #1778) (by Ye Kuang)
• [workflow] [cli] Improve coverage of 'ti format' and 'ti format_all' ([workflow] [cli] Improve coverage of 'ti format' and 'ti format_all' #1768) (by 彭于斌)
• [misc] Add "make_block_local" option to "CompileConfig" ([misc] Add "make_block_local" option to "CompileConfig" #1727) (by Yuanming Hu)

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[codecov]

Codecov Report

Merging #1818 into master will decrease coverage by 0.93%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master    #1818      +/-   ##
==========================================
- Coverage   43.67%   42.74%   -0.94%     
==========================================
  Files          44       44              
  Lines        6045     6254     +209     
  Branches     1082     1082              
==========================================
+ Hits         2640     2673      +33     
- Misses       3251     3425     +174     
- Partials      154      156       +2     

Impacted Files	Coverage Δ
python/taichi/lang/transformer.py	81.21% <ø> (-0.67%)	⬇️
python/taichi/lang/impl.py	64.37% <25.00%> (-2.94%)	⬇️
python/taichi/lang/ops.py	43.56% <0.00%> (-9.09%)	⬇️
python/taichi/lang/expr.py	61.65% <0.00%> (-5.20%)	⬇️
python/taichi/lang/matrix.py	64.34% <0.00%> (-4.53%)	⬇️
python/taichi/lang/snode.py	64.22% <0.00%> (-4.20%)	⬇️
python/taichi/lang/util.py	31.36% <0.00%> (-0.38%)	⬇️
python/taichi/main.py	23.03% <0.00%> (-0.37%)	⬇️
... and 11 more

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