Correct number of samples for VectorSpace.random_tangent_vec
#1990
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Description
When there are multiple basepoints, both implementations of
random_tangent_vec(the implementations inmanifold.pyandbase.py) should now check thatn_samplesmatches the number of basepoints. If the values do not match, then in casen_samples == 1(default option), it resets it to be equal to the number of basepoints. Otherwise an error is raised.Docstrings have been updated to clarify that the vectors generated have no statistical value.
Issue
Fixes #1989 insofar as the bug is no longer present. The reference to uniformity of direction understated the difficulty of that problem, so it should probably be ignored.