RNN === Computes an one-layer simple RNN. This operator is usually supported via some custom implementation such as CuDNN. Notations: * `X` - input tensor * `i` - input gate * `t` - time step (t-1 means previous time step) * `Wi` - W parameter weight matrix for input gate * `Ri` - R recurrence weight matrix... **Abstract Signature:** ``RNN(X: Tensor, W: Tensor, R: Tensor, B: Tensor, sequence_lens, initial_h: Tensor, activation_alpha: List[float], activation_beta: List[float], activations: List[str], clip: float, direction: str, hidden_size: int, layout: int)`` .. raw:: html