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https://issues.apache.org/jira/browse/SPARK-10736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14934985#comment-14934985
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Apache Spark commented on SPARK-10736:
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User 'yanboliang' has created a pull request for this issue:
https://github.com/apache/spark/pull/8937
> 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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