Dataset Preprocessing: Generating leave_df in amazon.ipynb about rechorus HOT 3 CLOSED

Yes, you are right. This is just to ensure all the dev/test samples have at least one history interaction. Besides, cause we construct clicked_item_set before cutting off the leave_df, positive items have no chance to be regarded as negative items.

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I guess the intention of doing like this would be to keep users with only one items inside the training data although there is a risk of including positive items as negative items.

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Awesome! I can see tremendous amount of your effort and consideration in the code :) Thanks for the reply.

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