Plumbing for np.ma

[bryevdv]

This PR just adds minimal wrapping for the NumPy masked array module. Currently things will just fall back to numpy and emit the fallback warning:

Welcome to Legion Python interactive console
>>> import cunumeric as np
>>> x = np.ma.array(np.matrix([[1, 2], [3, 4]]), mask=[[0, 1], [1, 0]])
/home/bryan/work/cunumeric/cunumeric/coverage.py:186: RuntimeWarning: cuNumeric has not implemented numpy.ma.array and is falling back to canonical NumPy. You may notice significantly decreased performance for this function call.
  warnings.warn(
>>> x
masked_matrix(
  data=[[1, --],
        [--, 4]],
  mask=[[False,  True],
        [ True, False]],
  fill_value=999999)
>>> x.sum()	
/home/bryan/work/cunumeric/cunumeric/coverage.py:186: RuntimeWarning: cuNumeric has not implemented numpy.ma.core.MaskedArray.sum and is falling back to canonical NumPy. You may notice significantly decreased performance for this function call.
  warnings.warn(
5

and now calls hows up in coverage reporting as well

old311 ❯ CUNUMERIC_REPORT_COVERAGE=1 CUNUMERIC_REPORT_DUMP_CSV="out.csv" legate ~/tmp/cov.py
cuNumeric API coverage: 0/1 (0.0%)

~/work/cunumeric bv/ma*

old311 ❯ cat out.csv 
function_name,location,implemented
numpy.ma.array,/home/bryan/work/legate.core/_skbuild/linux-x86_64-3.11/cmake-build/_deps/legion-src/bindings/python/build/lib/legion_top.py:295,False

[bryevdv]

Looks like actual new mypy failures, I will fix before merging.

[ipdemes]

@bryevdv
I tested this branch with PSANA test that uses numpy.ma and got following warning:

/home/idemeshko/development/cunumeric_ma/cunumeric/coverage.py:186: RuntimeWarning: cuNumeric has not implemented numpy.ma.array and is falling back to canonical NumPy. You may notice significantly decreased performance for this function call.
  warnings.warn(
/home/idemeshko/development/cunumeric_ma/cunumeric/coverage.py:186: RuntimeWarning: cuNumeric has not implemented numpy.ma.median and is falling back to canonical NumPy. You may notice significantly decreased performance for this function call.

[bryevdv]

@ipdemes That's the expected behavior for now, AFAIK? This PR does not actually implement any of the masked array functionality in cunumeric/legate, just makes it so that masked array code runs at all (with fallback) and can report the coverage misses.

[ipdemes]

@bryevdv :by my comment I just wanted to confirm that this PR works as expected in one of the users code:)

[bryevdv]

Ah I misunderstood the intent, thanks for testing it out! 😄