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must specify the right dtype !!!
a
Out[54]: array([1, 2, 3])
b = a.tostring()
np.fromstring(b)
Out[52]: array([ 4.94065646e-324, 9.88131292e-324, 1.48219694e-323]) #Wrong!
Out[56]: array([1, 2, 3])
type(a)
Out[57]: numpy.ndarray
type(a[0])
Out[58]: numpy.int64
np.fromstring(b, dtype=np.int64) # must use the right type!!!
Out[60]: array([1, 2, 3])