test_multiprocessing.py fix incorrect use of numpy.random.randint (#7030)
test_multiprocessing.py fix incorrect use of numpy.random.randint (#7030)

* test_multiprocessing.py fix test which actually throws two exceptions

* test_multiprocessing.py fixed incorrect usage of np.random.randint()
https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.random.randint.html

* test_multiprocessing.py remove extra parens

keras-team/keras,keras-team/keras