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numpy.ma.MaskedArray.shrink_mask
method
MaskedArray.shrink_mask()[source]- 
    
Reduce a mask to nomask when possible.
Parameters: - None
 
Returns: - None
 
Examples
>>> x = np.ma.array([[1,2 ], [3, 4]], mask=[0]*4) >>> x.mask array([[False, False], [False, False]]) >>> x.shrink_mask() >>> x.mask False 
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 https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.ma.MaskedArray.shrink_mask.html