attribute
dtype.base
Returns dtype for the base element of the subarrays, regardless of their dimension or shape.
See also
>>> x = numpy.dtype('8f') >>> x.base dtype('float32')
>>> x = numpy.dtype('i2') >>> x.base dtype('int16')
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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.dtype.base.html