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

RELEASES.md

@@ -15,6 +15,7 @@
 
 #### Closed issues
 
+- Remove a leftover debug `print` from `ot.utils.projection_sparse_simplex` with `axis=1`, and make the `ot.datasets.make_gauss_hd` docstring a raw string so importing `ot` no longer emits a `SyntaxWarning` (PR #860)
 - Fix `ot.dist` ignoring the weights `w` for `metric="cityblock"`, which returned the unweighted distance although the weights are documented for this metric (PR #859)
 - Fix swapped arguments to `div_to_product` in `ot.gromov.fused_unbalanced_across_spaces_cost`: with `reg_type="independent"` (UCOOT) the entropic terms used the plan marginals as the reference measures and vice versa (PR #855, Issue #854)
 - Fix device placement in `ot.batch.bregman_projection_batch` so `ot.solve_batch(..., method="sinkhorn")` no longer crashes on GPU when the torch default device is CPU (PR #851)

ot/datasets.py

@@ -186,7 +186,7 @@ def get_data_classif(dataset, n, nz=0.5, theta=0, random_state=None, **kwargs):
 def make_gauss_hd(
     ns, nt, p=100, dim=5, m_diff=3.0, a=(10.0, 15.0), b=(3.0, 3.0), sub_the_same=False
 ):
-    """Generation of source and target domains from Gaussian HD distributions
+    r"""Generation of source and target domains from Gaussian HD distributions
 
     Parameters
     ----------

ot/utils.py

@@ -201,7 +201,6 @@ def projection_sparse_simplex(V, max_nz, z=1, axis=None, nx=None):
 
         row_indices = nx.arange(V.shape[0])
         row_indices = row_indices.reshape(-1, 1)
-        print(row_indices.shape)
         # Extract the top max_nz values for each row
         # and then project to simplex.
         U = V[row_indices, max_nz_indices]