UltraGCN implementation as proposed by the authors #92
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…ation of matrices inspired by ItemKNN models
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Implemented UltraGCN as described in Mao (2021) and RecZoo UltraGCN. Made a small adjustment to improve the efficiency of the matrix calculation based on the calculation of the similarity matrix in ItemKNN
Introduced the following parameters as in the original repo:
Needed these for my research, and I welcome any feedback or suggestions for improvement!