public History fit_generator(IEnumerator <List <Dictionary <string, Array> > > generator, int steps_per_epoch,
int epochs = 1, int verbose = 1, CallbackList callbacks = null,
List <Dictionary <string, Array> > validation_data = null, int?validation_steps = null,
Dictionary <int, Tensor> class_weight = null,
int max_q_size = 10, int workers = 1, int initial_epoch = 0)
{
// """Fits the model on data generated batch-by-batch by a Python generator.
// The generator is run in parallel to the model, for efficiency.
// For instance, this allows you to do real-time data augmentation
// on images on CPU in parallel to training your model on GPU.
//# Arguments
// generator: A generator.
// The output of the generator must be either
// - a tuple (inputs, targets)
// - a tuple (inputs, targets, sample_weights).
// All arrays should contain the same number of samples.
// The generator is expected to loop over its data
// indefinitely.An epoch finishes when `steps_per_epoch`
// batches have been seen by the model.
// steps_per_epoch: Total number of steps (batches of samples)
// to yield from `generator` before declaring one epoch
// finished and starting the next epoch. It should typically
// be equal to the number of unique samples of your dataset
// divided by the batch size.
// epochs: Integer, total number of iterations on the data.
// verbose: Verbosity mode, 0, 1, or 2.
// callbacks: List of callbacks to be called during training.
// validation_data: This can be either
// - A generator for the validation data
// - A tuple (inputs, targets)
// - A tuple (inputs, targets, sample_weights).
// validation_steps: Only relevant if `validation_data`
// is a generator.
// Number of steps to yield from validation generator
// at the end of every epoch. It should typically
// be equal to the number of unique samples of your
// validation dataset divided by the batch size.
// class_weight: Dictionary mapping class indices to a weight
// for the class.
// max_q_size: Maximum size for the generator queue
// workers: Maximum number of processes to spin up
// pickle_safe: Ff true, use process based threading.
// Note that because
// this implementation relies on multiprocessing,
// you should not pass
// non picklable arguments to the generator
// as they can"t be passed
// easily to children processes.
// initial_epoch: Epoch at which to start training
// (useful for resuming a previous training run)
// # Returns
// A `History` object.
// # Raises
// RuntimeError: if the model was never compiled.
// # Example
// ```python
// public override void generate_arrays_from_file(path):
// while 1:
// f = open(path)
// for line in f:
// # create Numpy arrays of input data
// # and labels, from each line in the file
// x, y = process_line(line)
// yield (x, y)
// f.close()
// model.fit_generator(generate_arrays_from_file("/my_file.txt"),
// steps_per_epoch=1000, epochs=10)
// ```
// """
if (this.model == null)
{
throw new InvalidOperationException("The model needs to be compiled before being used.");
}
return(this.model.fit_generator(generator,
steps_per_epoch,
epochs,
verbose: verbose,
callbacks: callbacks,
validation_data: validation_data,
validation_steps: validation_steps,
class_weight: class_weight,
max_queue_size: max_q_size,
workers: workers,
//pickle_safe: pickle_safe,
initial_epoch: initial_epoch));
}
public override History fit(Dictionary <string, Array> x = null, Dictionary <string, Array> y = null, int batch_size = 32, int epochs = 1, int verbose = 1,
CallbackList callbacks = null, double validation_split = 0, IList <Dictionary <string, Array> > validation_data = null, Shuffle shuffle = Shuffle.True,
Dictionary <string, Dictionary <string, double> > class_weight = null, Dictionary <string, Array> sample_weight = null, int initial_epoch = 0, object kwargs = null)
{
//"""Trains the model for a fixed number of epochs.
//# Arguments
// x: input data, as a Numpy array or list of Numpy arrays
// (if the model has multiple inputs).
// y: labels, as a Numpy array.
// batch_size: integer.Number of samples per gradient update.
// epochs: integer, the number of epochs to train the model.
// verbose: 0 for no logging to stdout,
// 1 for progress bar logging, 2 for one log line per epoch.
// callbacks: list of `keras.callbacks.Callback` instances.
// List of callbacks to apply during training.
// See[callbacks](/callbacks).
// validation_split: float (0. < x< 1).
// Fraction of the data to use as held-out validation data.
// validation_data: tuple (x_val, y_val) or tuple
// (x_val, y_val, val_sample_weights) to be used as held-out
// validation data.Will override validation_split.
// shuffle: boolean or str (for "batch").
// Whether to shuffle the samples at each epoch.
// "batch" is a special option for dealing with the
// limitations of HDF5 data; it shuffles in batch-sized chunks.
// class_weight: dictionary mapping classes to a weight value,
// used for scaling the loss function (during training only).
// sample_weight: Numpy array of weights for
// the training samples, used for scaling the loss function
// (during training only). You can either pass a flat(1D)
// Numpy array with the same length as the input samples
// (1:1 mapping between weights and samples),
// or in the case of temporal data,
// you can pass a 2D array with shape(samples, sequence_length),
// to apply a different weight to every timestep of every sample.
// In this case you should make sure to specify
// sample_weight_mode= "temporal" in compile().
// initial_epoch: epoch at which to start training
// (useful for resuming a previous training run)
//# Returns
// 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).
//# Raises
// RuntimeError: if the model was never compiled.
//"""
if (this.model == null)
{
throw new InvalidOperationException("The model needs to be compiled before being used.");
}
return(model.fit(x, y,
batch_size,
epochs, verbose,
callbacks,
validation_split,
validation_data,
shuffle,
class_weight,
sample_weight,
initial_epoch,
kwargs));
}
