code: def recommendForAllItems(self, numUsers):
      return self._call_java("recommendForAllItems", numUsers)
  
imports: import sys
  from synapse.ml.recommendation._RankingTrainValidationSplitModel import _RankingTrainValidationSplitModel
  from pyspark.ml.util import *
label_desc: Use image node_id 2 for calling the RankingTrainValidationSplitModel obj's underlying member method code with example usage: obj.recommendForAllItems(numUsers) and returns: self