method
matrix.partition(kth, axis=1, kind='introselect', order=None)
Rearranges the elements in the array in such a way that the value of the element in kth position is in the position it would be in a sorted array. All elements smaller than the kth element are moved before this element and all equal or greater are moved behind it. The ordering of the elements in the two partitions is undefined.
New in version 1.8.0.
Parameters: 


See also
numpy.partition
argpartition
sort
See np.partition
for notes on the different algorithms.
>>> a = np.array([3, 4, 2, 1]) >>> a.partition(3) >>> a array([2, 1, 3, 4])
>>> a.partition((1, 3)) >>> a array([1, 2, 3, 4])
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https://docs.scipy.org/doc/numpy1.17.0/reference/generated/numpy.matrix.partition.html