numpy.ma.max()

axis : {None, int}, optional

Axis along which to operate. By default, axis is None and the flattened input is used.

out : array_like, optional

Alternative output array in which to place the result. Must be of the same shape and buffer length as the expected output.

fill_value : {var}, optional

Value used to fill in the masked values. If None, use the output of maximum_fill_value().