Add ADMMSLIM #662
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Add ADMMSLIM #662
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Very similar to SLIMElastic and EASE, but with a different optimization method and a few added tricks (item centering, item-specific L2 regularization)
The paper also includes the idea of item-specific L1 regularization, but didn't recommend it since it didn't show any improvement.
The paper has conditions to check for convergence of the ADMM method, but for simplicity I just used a fixed number of iterations (hyperparameter), as the paper did in its implementation.
See:
https://dl.acm.org/doi/pdf/10.1145/3336191.3371774