Github user gaborhermann commented on the issue:
https://github.com/apache/flink/pull/2542
@tillrohrmann thanks for clarifying!
Beside testing against Spark, I also did a small NumPy implementation, to
make sure iALS works well. Although, I did not make efforts to imitate the
initial random factor generation of Flink, so the results cannot be exactly the
same. I am also happy to share that if needed.
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