Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2542
@thvasilo you're right in the future we should make sure that we properly
document how we came up with the testing data.
What I've done to come up with the testing data for the `ALSITSuite` is to
factorize the given recommendation matrix with Matlab with the given parameters
(factors, iterations, etc). I've implemented ALS in Matlab for that. Ideally,
we use a library for that so that others can reproduce the test results. I can
share the ALS implementation if you like.
Ideally we do something similar for iALS.
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