Set Functions

isin	Tests x in test_elements for each element of x.
unique_all	Returns the unique elements of an input array x, the first occurring indices for each unique element in x, the indices from the set of unique elements that reconstruct x, and the corresponding counts for each unique element in x.
unique_counts	Returns the unique elements of an input array x and the corresponding counts for each unique element in x.
unique_inverse	Returns the unique elements of an input array x and the indices from the set of unique elements that reconstruct x.
unique_values	Returns the unique elements of an input array x.