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add trained decisionTree model

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{"class":"org.apache.spark.ml.PipelineModel","timestamp":1528814494291,"sparkVersion":"2.3.0","uid":"pipeline_4d5039f51541","paramMap":{"stageUids":["vecIdx_6662d17a7a75","dtr_a030d637309d"]}}
{"class":"org.apache.spark.ml.feature.VectorIndexerModel","timestamp":1528814494413,"sparkVersion":"2.3.0","uid":"vecIdx_6662d17a7a75","paramMap":{"handleInvalid":"error","inputCol":"features","outputCol":"indexedFeatures","maxCategories":2}}
{"class":"org.apache.spark.ml.regression.DecisionTreeRegressionModel","timestamp":1528814495043,"sparkVersion":"2.3.0","uid":"dtr_a030d637309d","paramMap":{"impurity":"variance","maxBins":32,"maxDepth":10,"labelCol":"is_attributed","featuresCol":"indexedFeatures","predictionCol":"prediction","minInfoGain":0.0,"seed":926680331,"checkpointInterval":10,"cacheNodeIds":false,"minInstancesPerNode":1,"maxMemoryInMB":256},"numFeatures":9}