'Sets value for states. Only one of states & value can be specified.
Parameters
states : list of list of NDArray
Source states arrays formatted like
``[[state1_dev1, state1_dev2], [state2_dev1, state2_dev2]]``.
value : number
A single scalar value for all state arrays.'

def set_states(self, states=None, value=None):

    assert (self.binded and self.params_initialized)
    assert ((not states) and (not value))
