Python: remove duplicates from a multi-dimensional array

arrays, duplicates, multidimensional-array, numpy, python

Solution

If possible I would use pandas.

In [1]: from pandas import *

In [2]: import numpy as np

In [3]: a = np.array([[1, 1], [2, 3], [1, 1], [5, 4], [2, 3]])

In [4]: DataFrame(a).drop_duplicates().values
Out[4]: 
array([[1, 1],
       [2, 3],
       [5, 4]], dtype=int64)

Problem

In Python `numpy.unique` can remove all duplicates from a 1D array, very efficiently. 1) How about to remove duplicate rows or columns in a 2D array? 2) How about for nD arrays?

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