Following the discussion. Prof. Aparna ...I am learning

https://www.mathworks.com/matlabcentral/answers/62668-what-is-epoch-in-neural-network

Dear Vikrant Guleria

All the graphs what you shows in your question that called Postprocessing plots to analyze network performance, including mean squared error validation performance for successive training epochs, error histogram and also confusion matrices for training, validation, and test phases. And this is some link maybe useful

https://www.researchgate.net/post/What_is_an_epoch

https://stackoverflow.com/questions/4752626/epoch-vs-iteration-when-training-neural-networks

https://www.quora.com/What-is-the-difference-between-iterations-and-epochs-in-Convolution-neural-networks

https://towardsdatascience.com/epoch-vs-iterations-vs-batch-size-4dfb9c7ce9c9

all the best

one epoch = one forward pass and one backward pass of all the training examples.

A term that is often used in the context of machine learning. An epoch is one complete presentation of the data set to be learned to a neural network.