This is documentation for Rasa Open Source Documentation v2.4.x, which is no longer actively maintained.
For up-to-date documentation, see the latest version (2.6.x).

Version: 2.4.x


TmpKerasModel Objects

class TmpKerasModel(tf.keras.models.Model)

Temporary solution. Keras model that uses a custom data adapter inside fit.


| @training.enable_multi_worker
| fit(x: Optional[
| Union[np.ndarray, tf.Tensor,, tf.keras.utils.Sequence]
| ] = None, y: Optional[
| Union[np.ndarray, tf.Tensor,, tf.keras.utils.Sequence]
| ] = None, batch_size: Optional[int] = None, epochs: int = 1, verbose: int = 1, callbacks: Optional[List[Callback]] = None, validation_split: float = 0.0, validation_data: Optional[Any] = None, shuffle: bool = True, class_weight: Optional[Dict[int, float]] = None, sample_weight: Optional[np.ndarray] = None, initial_epoch: int = 0, steps_per_epoch: Optional[int] = None, validation_steps: Optional[int] = None, validation_batch_size: Optional[int] = None, validation_freq: int = 1, max_queue_size: int = 10, workers: int = 1, use_multiprocessing: bool = False)

Trains the model for a fixed number of epochs (iterations on a dataset).


  • x - Input data.
  • y - Target data.
  • batch_size - Number of samples per gradient update.
  • epochs - Number of epochs to train the model.
  • verbose - Verbosity mode. 0 = silent, 1 = progress bar, 2 = one line per epoch.
  • callbacks - List of keras.callbacks.Callback instances.
  • validation_split - Fraction of the training data to be used as validation data.
  • validation_data - Data on which to evaluate the loss and any model metrics at the end of each epoch.
  • shuffle - whether to shuffle the training data before each epoch
  • class_weight - Optional dictionary mapping class indices (integers) to a weight (float) value, used for weighting the loss function (during training only).
  • sample_weight - Optional Numpy array of weights for the training samples, used for weighting the loss function (during training only).
  • initial_epoch - Epoch at which to start training
  • steps_per_epoch - Total number of steps (batches of samples) before declaring one epoch finished and starting the next epoch.
  • validation_steps - Total number of steps (batches of samples) to draw before stopping when performing validation at the end of every epoch.
  • validation_batch_size - Number of samples per validation batch.
  • validation_freq - specifies how many training epochs to run before a new validation run is performed
  • max_queue_size - Maximum size for the generator queue.
  • workers - Maximum number of processes to spin up when using process-based threading.
  • use_multiprocessing - If True, use process-based threading.


A History object. Its History.history attribute is a record of training loss values and metrics values at successive epochs, as well as validation loss values and validation metrics values (if applicable).


  • RuntimeError - 1. If the model was never compiled or, 2. If is wrapped in tf.function.
  • ValueError - In case of mismatch between the provided input data and what the model expects.

CustomDataHandler Objects

class CustomDataHandler(DataHandler)

Handles iterating over epoch-level objects.


| enumerate_epochs()

Yields (epoch,