PeiJieSun/diffnet

The user_item_num_for_sparsity_dict variable reports an error

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Diffnet-master /Diffnet++/class/DataModule.py 102 What should the user_item_num_for_sparsity_dict variable be? Why is there an error?
@PeiJieSun @lijunweiyhn I would appreciate it if you could help me.