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Reduce learning rate when a metric has stopped improving.

Inherits From: Callback

Models often benefit from reducing the learning rate by a factor of 2-10 once learning stagnates. This callback monitors a quantity and if no improvement is seen for a 'patience' number of epochs, the learning rate is reduced.


reduce_lr = ReduceLROnPlateau(monitor='val_loss', factor=0.2,
                              patience=5, min_lr=0.001), Y_train, callbacks=[reduce_lr])

monitor quantity to be monitored.
factor factor by which the learning rate will be reduced. new_lr = lr * factor.
patience number of epochs with no improvement after which learning rate will be reduced.
verbose int. 0: quiet, 1: update messages.
mode one of {'auto', 'min', 'max'}. In 'min' mode, the learning rate will be reduced when the quantity monitored has stopped decreasing; in 'max' mode it will be reduced when the quantity monitored has stopped increasing; in 'auto' mode, the direction is automatically inferred from the name of the monitored quantity.
min_delta threshold for measuring the new optimum, to only focus on significant changes.
cooldown number of epochs to wait before resuming normal operation after lr has been reduced.
min_lr lower bound on the learning rate.



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