seseed in np.random code example

Example 1: set seed numpy

numpy.random.seed()

Example 2: numpy random normal seed time

>>> numpy.random.rand(4)
array([ 0.42,  0.65,  0.44,  0.89])
>>> numpy.random.rand(4)
array([ 0.96,  0.38,  0.79,  0.53])