viirya commented on issue #25576: [SPARK-28866][ML] Persist item factors RDD when checkpointing in ALS URL: https://github.com/apache/spark/pull/25576#issuecomment-525330242 The comment saying itemFactors gets materialized in computeFactors, is located in the block of `implicitPrefs` is true. In computeFactors, we call computeYtY to aggregate a value from the given RDD of factor blocks, so I think it is materialized here.
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