Fully-connected RNN where the output is to be fed back to input. Corresponds to the SimpleRNN Keras layer .

- Name prefix
- The name prefix of the layer. The prefix is complemented by an index suffix to obtain a unique layer name. If this option is unchecked, the name prefix is derived from the layer type.
- Input tensor
- The tensor to use as input for the layer.
- Hidden state tensor
- The tensor to use as initial hidden state in case the corresponding port is connected.
- Units
- Dimensionality of the output space.
- Activation
- The activation function to use on the input transformations.
- Use bias
- If checked, a bias vector will be used.
- Return sequences
- Whether to return the last output in the output sequence or the full output sequence. If selected the output will have shape [time, units] otherwise the output will have shape [units].
- Return state
- Whether to return the hidden state in addition to the layer output. If selected the layer returns two tensors, the normal output and the hidden state of the layer. If sequences are returned, this also applies to the hidden state.
- Dropout
- Fraction of the units to drop for the linear transformation of the input.
- Recurrent dropout
- Fraction of the units to drop for the linear transformation of the recurrent state.
- Go backwards
- Whether to go backwards in time i.e. read the input sequence backwards.
- Unroll
- Whether to unroll the network i.e. convert it in a feed-forward network that reuses the layer's weights for each timestep. Unrolling can speed up an RNN but it's more memory-expensive and only suitable for short sequences. If the layer is not unrolled, a symbolic loop is used.

- Kernel initializer
- Initializer for the weight matrix used for the linear transformations of the input. See initializers for details on the available initializers.
- Recurrent initializer
- Initializer for the weight matrix used for the linear transformation of the recurrent connection. See initializers for details on the available initializers.
- Bias initializer
- Initializer for the bias vector (if a bias is used). See initializers for details on the available initializers.

- Kernel regularizer
- Regularizer function applied to the weight matrix. See regularizers for details on the available regularizers.
- Recurrent regularizer
- Regularizer function applied to the weight matrix for the recurrent connection. See regularizers for details on the available regularizers.
- Bias regularizer
- Regularizer function applied to the bias vector. See regularizers for details on the available regularizers.
- Activity regularizer
- Regularizer function applied to the output of the layer i.e. its activation. See regularizers for details on the available regularizers.

- Kernel constraint
- Constraint on the weight matrix for the input connection. See constraints for details on the available constraints.
- Recurrent constraint
- Constraint on the weight matrix for the recurrent connection. See constraints for details on the available constraints.
- Bias constraint
- Constraint on the bias vector. See constraints for details on the available constraints.

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