https://www.quora.com/What-is-epochs-in-machine-learning?share=1

University of Michigan - Ann Arbor

When you try to train a huge amount of data with limited computer memory, you can separate the whole training set to several batches that can fit into your computer memory. Then you feed these batches to your model one by one. After feeding all batches once, you complete one epoch. To successfully train your model, you need multiple epochs.

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