The `on_epoch_end` method in the `keras.callbacks.TensorBoard` class is called at the end of each epoch during training. It is a callback function that is used to log metrics and update visualizations in TensorBoard, a tool for visualizing TensorFlow graphs and training metrics. This method allows users to customize the behavior of TensorBoard at the end of each epoch, such as adding custom histograms or log values for better visualization and analysis of the model's performance.
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