[MRG] Remove a debug print in projection_sparse_simplex and a SyntaxWarning on import

[itzzdev09]

Types of changes

• Bug fix

Description

Two small clean-ups:

• ot.utils.projection_sparse_simplex(..., axis=1) printed row_indices.shape on every call, a debug line left over from [MRG] add the sparsity-constrained optimal transport funtionality and example #459.
• The ot.datasets.make_gauss_hd docstring contains \delta in a normal string, so importing ot emits SyntaxWarning: invalid escape sequence '\d' on Python 3.12+. It is now a raw string, as was done for other docstrings in Use raw strings with TeX #657 and [MRG] fix: make the documentation of _get_loss_unbalanced as a raw string #716.

How has this been tested

python -W error::SyntaxWarning -c "import ot" now succeeds, and calling projection_sparse_simplex with axis=1 no longer prints anything. test/test_utils.py passes.

Checklist

• I have updated the RELEASES.md file.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.85%. Comparing base (649b968) to head (5bb191b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #860      +/-   ##
==========================================
- Coverage   96.85%   96.85%   -0.01%     
==========================================
  Files         128      128              
  Lines       26197    26196       -1     
==========================================
- Hits        25373    25372       -1     
  Misses        824      824              

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