This post illustrates the early stopping callback in Keras.

The training data is a 3 time steps for two variables. The target value is sum of three time steps values for the first variable.

Simulate the data

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import numpy as np
import pandas as pd
np.random.seed(1234)
X = np.random.normal(size=(1000,6))
Y = X[:,0:3].sum(axis=1)

Define the Model and Callback

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from keras.callbacks import EarlyStopping
from keras.layers import Dense
from keras.models import Sequential

model = Sequential()
model.add(Dense(100, activation='relu', input_dim= 6))
model.add(Dense(1))
model.compile(optimizer='adam', loss='mse')
es = EarlyStopping(monitor='val_loss', min_delta=0.0001, patience=20)
history = model.fit(X,Y, validation_split=0.2, shuffle=False,epochs=1000,
callbacks=[es])

Even though the number of epochs specified is 1000, the early stopping callback stops the training at the end of 119 epochs

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Epoch 119/1000

32/800 [>………………………..] - ETA: 0s - loss: 2.0512e-04
800/800 [==============================] - 0s 27us/step - loss: 1.9612e-04 - val_loss: 7.5999e-04
Epoch 120/1000


32/800 [>………………………..] - ETA: 0s - loss: 2.0067e-04
800/800 [==============================] - 0s 25us/step - loss: 1.9326e-04 - val_loss: 7.5662e-04
Epoch 121/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.9639e-04
800/800 [==============================] - 0s 25us/step - loss: 1.9060e-04 - val_loss: 7.5309e-04
Epoch 122/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.9208e-04
800/800 [==============================] - 0s 25us/step - loss: 1.8788e-04 - val_loss: 7.4992e-04
Epoch 123/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.8804e-04
800/800 [==============================] - 0s 26us/step - loss: 1.8540e-04 - val_loss: 7.4602e-04
Epoch 124/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.8407e-04
800/800 [==============================] - 0s 25us/step - loss: 1.8298e-04 - val_loss: 7.4188e-04
Epoch 125/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.7936e-04
800/800 [==============================] - 0s 25us/step - loss: 1.8051e-04 - val_loss: 7.3798e-04
Epoch 126/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.7523e-04
800/800 [==============================] - 0s 30us/step - loss: 1.7818e-04 - val_loss: 7.3394e-04
Epoch 127/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.7129e-04
800/800 [==============================] - 0s 24us/step - loss: 1.7581e-04 - val_loss: 7.3082e-04
Epoch 128/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.6748e-04
800/800 [==============================] - 0s 22us/step - loss: 1.7354e-04 - val_loss: 7.2578e-04
Epoch 129/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.6340e-04
800/800 [==============================] - 0s 24us/step - loss: 1.7124e-04 - val_loss: 7.2199e-04
Epoch 130/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.6007e-04
800/800 [==============================] - 0s 24us/step - loss: 1.6888e-04 - val_loss: 7.1804e-04
Epoch 131/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.5657e-04
800/800 [==============================] - 0s 26us/step - loss: 1.6662e-04 - val_loss: 7.1401e-04
Epoch 132/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.5324e-04
800/800 [==============================] - 0s 26us/step - loss: 1.6433e-04 - val_loss: 7.1052e-04
Epoch 133/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.4963e-04
800/800 [==============================] - 0s 24us/step - loss: 1.6205e-04 - val_loss: 7.0707e-04
Epoch 134/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.4632e-04
800/800 [==============================] - 0s 29us/step - loss: 1.5987e-04 - val_loss: 7.0297e-04
Epoch 135/1000


32/800 [>………………………..] - ETA: 0s - loss: 1.4298e-04
800/800 [==============================] - 0s 32us/step - loss: 1.5774e-04 - val_loss: 7.0025e-04

Takeaway Deliberate practice on Keras callbacks