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huangtinglin avatar huangtinglin commented on July 20, 2024

Sorry for the late reply. Actually, I found that it has little effect on the performance. Besides, the author also applies the same approach in the official implementation of NGCF:

https://github.com/xiangwang1223/neural_graph_collaborative_filtering/blob/master/NGCF/NGCF.py#L194

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xizhu1022 avatar xizhu1022 commented on July 20, 2024

There is difference between the implementation of this code and original paper. The similar issue is also mentioned in offical implementation.
According to Equation 6&7 from the paper, the self-connection should be added in the forward of NGCF. The authors probably did it in the Laplacian matrix computing by msitake. If so, everything else is correct.

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