huaxingao opened a new pull request #26035: [SPARK-29360][PYTHON][ML] PySpark 
FPGrowthModel supports getter/setter
URL: https://github.com/apache/spark/pull/26035
 
 
   ### What changes were proposed in this pull request?
   
   ### Why are the changes needed?
   Keep parity between Scala and Python
   
   
   ### Does this PR introduce any user-facing change?
   add the following getters/setter to FPGrowthModel 
   ```
   getMinSupport
   getNumPartitions
   getMinConfidence
   getItemsCol
   getPredictionCol
   setItemsCol
   setMinConfidence
   setPredictionCol
   ```
   add following getters/setters to PrefixSpan
   ```
   set/getMinSupport
   set/getMaxPatternLength
   set/getMaxLocalProjDBSize
   set/getSequenceCol
   ```
   
   ### How was this patch tested?
   add doctest
   

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