Github user gaborhermann commented on the issue:
https://github.com/apache/flink/pull/2542
Hi @thvasilo, thanks for reviewing my code.
You are right, @jfeher told me that the numbers in the left column indicate
the number of non-zero elements in the rating matrix. We are actually planning
to do experiments on a larger data set, but not right now.
Do you think it's important to do so before merging the PR? If so we'll do
it ASAP.
Thanks for the suggestion, I marked the PR with the [ml] tag.
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