Xiangrui Meng created SPARK-6637:
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Summary: Test lambda weighting in implicit ALS
Key: SPARK-6637
URL: https://issues.apache.org/jira/browse/SPARK-6637
Project: Spark
Issue Type: Task
Components: MLlib
Affects Versions: 1.3.0
Reporter: Xiangrui Meng
As discussed on the user-list, there is some inconsistency between 1.2 and 1.3
on how we scale lambda in the implicit formulation. In 1.2 we scale by the
number of explicit ratings, while in 1.3 we scale by the number of users/items.
https://www.mail-archive.com/user@spark.apache.org/msg24817.html
It is worth testing which is more proper for implicit feedback.
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