Training issue

[920703]

I was training your model. I had run it for 20 epochs and set the training batch size to 5. During training , i have seen that when it comes to 6th epoch at iteration 4660 out of 5495, the learning rate becomes 0.0 and it remain until the training finished. i. till 20th epoch.

and the last epoch results is

what is the reason behind this? I have used all the default values, nothing changed.

Any help will be appreciated. Thanks