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numpy.ma.MaskedArray.soften_mask
method
ma.MaskedArray.soften_mask()[source]- 
    
Force the mask to soft.
Whether the mask of a masked array is hard or soft is determined by its
hardmaskproperty.soften_masksetshardmasktoFalse.See also
 
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Licensed under the 3-clause BSD License.
 https://numpy.org/doc/1.20/reference/generated/numpy.ma.MaskedArray.soften_mask.html