TensorFlow 2 Tutorial: Get Started in Deep Learning With tf.keras

You can easily create learning curves for your deep learning models. First, you must update your call to the fit function to include reference to a validation dataset. This is a portion of the training set not used to fit the model, and is instead used to evaluate the performance of the model during training. You can split the data manually and specify the validation_data argument, or you can use the validation_split argument and specify a percentage split of the training dataset and let the API perform the split for you. The latter is simpler for now.