seed : int, sequence, ‘default’, optional
If ‘default’, the random seed is reset to a default value.
If seed is a sequence containing 55 floating-point numbers
in range [0,1], these are used to set the internal state of
the generator.
If the value is an integer, the internal state is obtained
from numpy.random.RandomState (MT19937) with the integer
used as the initial seed.
If seed is omitted (None), numpy.random is used to
initialize the generator.
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