<p>I think that </p>

<p><a href="https://stats.stackexchange.com/questions/312780/why-is-accuracy-not-the-best-measure-for-assessing-classification-models/312787#312787">Why is accuracy not the best measure for assessing classification models?</a></p>

<p>is the closest answer about this issue; I don't believe it exactly addresses what you're asking about, the change in accuracy or loss <em>across epochs during training</em>, but only the shortcomings of comparing models on the basis of accuracy reported after training has completed.</p>
