Run one step of LSTM. Args: inputs: input Tensor, 2D, `[batch, num_units]. state: if `state_is_tuple` is False, this must be a state Tensor, `2-D, [batch, state_size]`. If `state_is_tuple` is True, this must be a tuple of state Tensors, both `2-D`, with column sizes
(self, inputs, state)
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