def unshare_mask(self):
if self._sharedmask:<EOL><INDENT>self._mask = self._mask.copy()<EOL>self._sharedmask = False<EOL><DEDENT>return self<EOL>
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
--------
sharedmask