Github user feynmanliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/7412#discussion_r34648954
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/fpm/PrefixSpan.scala
---
@@ -86,16 +88,69 @@ class PrefixSpan private (
getFreqItemAndCounts(minCount, sequences).collect()
val prefixAndProjectedDatabase = getPrefixAndProjectedDatabase(
lengthOnePatternsAndCounts.map(_._1), sequences)
- val groupedProjectedDatabase = prefixAndProjectedDatabase
- .map(x => (x._1.toSeq, x._2))
- .groupByKey()
- .map(x => (x._1.toArray, x._2.toArray))
- val nextPatterns = getPatternsInLocal(minCount,
groupedProjectedDatabase)
- val lengthOnePatternsAndCountsRdd =
- sequences.sparkContext.parallelize(
- lengthOnePatternsAndCounts.map(x => (Array(x._1), x._2)))
- val allPatterns = lengthOnePatternsAndCountsRdd ++ nextPatterns
- allPatterns
+
+ var patternsCount = lengthOnePatternsAndCounts.length
+ var allPatternAndCounts = sequences.sparkContext.parallelize(
+ lengthOnePatternsAndCounts.map(x => (Array(x._1), x._2)))
+ var currentProjectedDatabase = prefixAndProjectedDatabase
+ while (patternsCount <= minPatternsBeforeShuffle &&
+ currentProjectedDatabase.count() != 0) {
+ val (nextPatternAndCounts, nextProjectedDatabase) =
+ getPatternCountsAndProjectedDatabase(minCount,
currentProjectedDatabase)
+ patternsCount = nextPatternAndCounts.count().toInt
+ currentProjectedDatabase = nextProjectedDatabase
+ allPatternAndCounts = allPatternAndCounts ++ nextPatternAndCounts
+ }
+ if (patternsCount > 0) {
+ val groupedProjectedDatabase = currentProjectedDatabase
--- End diff --
This is the `projectedDatabases`; everything before was (prefix,suffix)
pairs
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