Xiangrui Meng created SPARK-10736:
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Summary: Use 1 for all ratings if $(ratingCol) = ""
Key: SPARK-10736
URL: https://issues.apache.org/jira/browse/SPARK-10736
Project: Spark
Issue Type: Improvement
Components: ML
Affects Versions: 1.6.0
Reporter: Xiangrui Meng
Priority: Minor
For some implicit dataset, ratings may not exist in the training data. In this
case, we can assume all observed pairs to be positive and treat their ratings
as 1. This should happen when users set ratingCol to an empty string.
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