'Sets value for states. Only one of the states & value can be specified.
Parameters
states : list of list of NDArrays
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)
    self._exec_group.set_states(states, value)
