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I am working on training a deep neural network (with pre-training) on millions of data recently. However, I found out that the loss shows a form of periodic phenomenon (about 60000 steps for 1 epoch), as shown below: loss_vs_updates Also, its performance of external evaluation on the validation set was fluctuating, as shown below (higher is better): eval_vs_updates

My questions are:

  1. What kind of causes can result in such phenomenon?
  2. Then what can I do to improve my network?
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closed as off-topic by Reinstate Monica, kjetil b halvorsen, Peter Flom - Reinstate Monica Jun 2 '18 at 12:07

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    $\begingroup$ I'm voting to close this question as off-topic because there's not enough information about how the network is constructed to provide a useful answer. $\endgroup$ – Reinstate Monica Jun 1 '18 at 21:19
  • $\begingroup$ Two common causes of this behavior are 1. not shuffling the data 2. setting the learning rate too high $\endgroup$ – Reinstate Monica Jun 1 '18 at 21:19