[💡SUG] Support for dual-target or multi-target cross-domain recommendation about recbole-cdr HOT 2 CLOSED

@ShadowTinker Hello, thanks for your attention to RecBole-CDR!
Thank you for your advice! We will consider providing support for multi-target CDR in the new release. As for the source_split_flag in dataset.py, we can not implement multi-target CDR with this parameter. It only provides the training data of the source domain for training, and the ultimate goal is to improve the performance of the target domain. Maybe you can try changing the source domain dataset structure while getting training, validation, test sets, and changing the evaluation method in the trainer.

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@Wicknight Thanks for your reply and kind advice! I'm looking forward to the new release of RecBole-CDR. I'll try to change the code according to your suggestion.

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