method
Copy the mask and set the sharedmask flag to False.
Whether the mask is shared between masked arrays can be seen from the sharedmask
property. unshare_mask
ensures the mask is not shared. A copy of the mask is only made if it was shared.
See also
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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.ma.MaskedArray.unshare_mask.html