def unique(x, return_index=False):
"""
Find the unique elements of an array.
Returns the sorted unique elements of an array. There are three optional
outputs in addition to the unique elements: the indices of the input array
that give the unique values, the indices of the unique array that
reconstruct the input array, and the number of times each unique value
comes up in the input array.
"""
y, indices = tensorflow.unique(x)
if return_index:
return y, indices
else:
return y
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