R/callbacks.R

callback_lambda

Create a custom callback

Description

This callback is constructed with anonymous functions that will be called at the appropriate time. Note that the callbacks expects positional arguments, as:

Usage

 
callback_lambda( 
  on_epoch_begin = NULL, 
  on_epoch_end = NULL, 
  on_batch_begin = NULL, 
  on_batch_end = NULL, 
  on_train_batch_begin = NULL, 
  on_train_batch_end = NULL, 
  on_train_begin = NULL, 
  on_train_end = NULL, 
  on_predict_batch_begin = NULL, 
  on_predict_batch_end = NULL, 
  on_predict_begin = NULL, 
  on_predict_end = NULL, 
  on_test_batch_begin = NULL, 
  on_test_batch_end = NULL, 
  on_test_begin = NULL, 
  on_test_end = NULL 
)

Arguments

Arguments Description
on_epoch_begin called at the beginning of every epoch.
on_epoch_end called at the end of every epoch.
on_batch_begin called at the beginning of every training batch.
on_batch_end called at the end of every training batch.
on_train_batch_begin called at the beginning of every batch.
on_train_batch_end called at the end of every batch.
on_train_begin called at the beginning of model training.
on_train_end called at the end of model training.
on_predict_batch_begin called at the beginning of a batch in predict methods.
on_predict_batch_end called at the end of a batch in predict methods.
on_predict_begin called at the beginning of prediction.
on_predict_end called at the end of prediction.
on_test_batch_begin called at the beginning of a batch in evaluate methods. Also called at the beginning of a validation batch in the fit methods, if validation data is provided.
on_test_batch_end called at the end of a batch in evaluate methods. Also called at the end of a validation batch in the fit methods, if validation data is provided.
on_test_begin called at the beginning of evaluation or validation.
on_test_end called at the end of evaluation or validation.

Details

  • on_epoch_begin and on_epoch_end expect two positional arguments: epoch, logs

  • on_batch_*, on_train_batch_*, on_predict_batch_* and on_test_batch_*, expect two positional arguments: batch, logs

  • on_train_*, on_test_* and on_predict_* expect one positional argument: logs

See Also

Other callbacks: callback_csv_logger(), callback_early_stopping(), callback_learning_rate_scheduler(), callback_model_checkpoint(), callback_progbar_logger(), callback_reduce_lr_on_plateau(), callback_remote_monitor(), callback_tensorboard(), callback_terminate_on_naan()