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[backport] Fix pdist docstring in order to specify that the returned matrix is condensed #8187

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Feb 15, 2024
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[backport] Fix pdist docstring in order to specify that the returned matrix is condensed #8187

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9 changes: 5 additions & 4 deletions cupyx/scipy/spatial/distance.py
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Original file line number Diff line number Diff line change
Expand Up @@ -543,10 +543,11 @@ def pdist(X, metric='euclidean', *, out=None, **kwargs):

Returns:
Y (cupy.ndarray):
A :math:`m` by :math:`m` distance matrix is
returned. For each :math:`i` and :math:`j`, the metric
``dist(u=X[i], v=X[j])`` is computed and stored in the
:math:`ij` th entry.
Returns a condensed distance matrix Y. For each :math:`i` and
:math:`j` and (where :math:`i < j < m`), where m is the number of
original observations. The metric ``dist(u=X[i], v=X[j])`` is
computed and stored in entry
``m * i + j - ((i + 2) * (i + 1)) // 2``.
"""
all_dist = cdist(X, X, metric=metric, out=out, **kwargs)
up_idx = cupy.triu_indices_from(all_dist, 1)
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