Can someone tell me what's wrong with this notebook?

Hi, I am participating in a competition on hacker earth. But when I create my submission file all of the predicted classes are coming same. I would be very grateful if someone could have a look at my notebook and figure out if something is wrong?

Here is the link:

Here is the competitions link:
https://www.hackerearth.com/challenges/competitive/hackerearth-deep-learning-challenge-holidays/

Thanks :slight_smile:

You will have to give access to the file for the community to help.