spark git commit: [SPARK-16240][ML] ML persistence backward compatibility for LDA - 2.0 backport

Repository: spark Updated Branches: refs/heads/branch-2.0 22216d6bd -> 54d4eee51 [SPARK-16240][ML] ML persistence backward compatibility for LDA - 2.0 backport ## What changes were proposed in this pull request? Allow Spark 2.x to load instances of LDA, LocalLDAModel, and

spark git commit: [SPARK-16240][ML] ML persistence backward compatibility for LDA

Repository: spark Updated Branches: refs/heads/master 0d6348750 -> f4f6bd8c9 [SPARK-16240][ML] ML persistence backward compatibility for LDA ## What changes were proposed in this pull request? Allow Spark 2.x to load instances of LDA, LocalLDAModel, and DistributedLDAModel saved from Spark