[GitHub] spark pull request #20810: [SPARK-20114][ML] spark.ml parity for sequential ...

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[GitHub] spark pull request #20810: [SPARK-20114][ML] spark.ml parity for sequential ...

GitHub user WeichenXu123 opened a pull request: https://github.com/apache/spark/pull/20810 [SPARK-20114][ML] spark.ml parity for sequential pattern mining - PrefixSpan ## What changes were proposed in this pull request? PrefixSpan API for spark.ml. Note: Currently t