TrainingListener (Deep Java Library 0.16.0 API specification)

All Known Implementing Classes:

DivergenceCheckTrainingListener, EpochTrainingListener, EvaluatorTrainingListener, LoggingTrainingListener, MemoryTrainingListener, SaveModelTrainingListener, TimeMeasureTrainingListener, TrainingListenerAdapter
```
public interface TrainingListener
```
TrainingListener offers an interface that performs some actions when certain events have occurred in the Trainer.
The methods onEpoch, onTrainingBatch, onValidationBatch are called during training. Adding an implementation of the listener to the Trainer will perform any desired action at those junctures. These could be used for collection metrics, or logging, or any other purpose to enhance the training process.
There are many listeners that contain different functionality, and it is often best to combine a number of listeners. We recommend starting with one of our sets of TrainingListener.Defaults. Then, more listeners can be added afterwards.

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static class`	`TrainingListener.BatchData`	A class to pass data from the batch into the training listeners.
`static interface`	`TrainingListener.Defaults`	Contains default `TrainingListener` sets.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onEpoch(Trainer trainer)`	Listens to the end of an epoch during training.
`void`	`onTrainingBatch(Trainer trainer, TrainingListener.BatchData batchData)`	Listens to the end of training one batch of data during training.
`void`	`onTrainingBegin(Trainer trainer)`	Listens to the beginning of training.
`void`	`onTrainingEnd(Trainer trainer)`	Listens to the end of training.
`void`	`onValidationBatch(Trainer trainer, TrainingListener.BatchData batchData)`	Listens to the end of validating one batch of data during validation.

- Method Detail
  - onEpoch
```
void onEpoch(Trainer trainer)
```
    Listens to the end of an epoch during training.
    
    Parameters:
    
    trainer - the trainer the listener is attached to
  - onTrainingBatch
```
void onTrainingBatch(Trainer trainer,
                     TrainingListener.BatchData batchData)
```
    Listens to the end of training one batch of data during training.
    
    Parameters:
    
    trainer - the trainer the listener is attached to
    
    batchData - the data from the batch
  - onValidationBatch
```
void onValidationBatch(Trainer trainer,
                       TrainingListener.BatchData batchData)
```
    Listens to the end of validating one batch of data during validation.
    
    Parameters:
    
    trainer - the trainer the listener is attached to
    
    batchData - the data from the batch
  - onTrainingBegin
```
void onTrainingBegin(Trainer trainer)
```
    Listens to the beginning of training.
    
    Parameters:
    
    trainer - the trainer the listener is attached to
  - onTrainingEnd
```
void onTrainingEnd(Trainer trainer)
```
    Listens to the end of training.
    
    Parameters:
    
    trainer - the trainer the listener is attached to