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https://issues.apache.org/jira/browse/SPARK-11284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xiangrui Meng closed SPARK-11284.
---------------------------------
Resolution: Not A Problem
> ALS produces predictions as floats and should be double
> -------------------------------------------------------
>
> Key: SPARK-11284
> URL: https://issues.apache.org/jira/browse/SPARK-11284
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 1.5.1
> Environment: All
> Reporter: Dominik Dahlem
> Labels: ml, recommender
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> Using pyspark.ml and DataFrames, The ALS recommender cannot be evaluated
> using the RegressionEvaluator, because of a type mis-match between the model
> transformation and the evaluation APIs. One can work around this by casting
> the prediction column into double before passing it into the evaluator.
> However, this does not work with pipelines and cross validation.
> Code and traceback below:
> {code}
> als = ALS(rank=10, maxIter=30, regParam=0.1, userCol='userID',
> itemCol='movieID', ratingCol='rating')
> model = als.fit(training)
> predictions = model.transform(validation)
> evaluator = RegressionEvaluator(predictionCol='prediction',
> labelCol='rating')
> validationRmse = evaluator.evaluate(predictions,
> {evaluator.metricName: 'rmse'})
> {code}
> Traceback:
> validationRmse = evaluator.evaluate(predictions, {evaluator.metricName:
> 'rmse'})
> File
> "/Users/dominikdahlem/software/spark-1.6.0-SNAPSHOT-bin-custom-spark/python/lib/pyspark.zip/pyspark/ml/evaluation.py",
> line 63, in evaluate
> File
> "/Users/dominikdahlem/software/spark-1.6.0-SNAPSHOT-bin-custom-spark/python/lib/pyspark.zip/pyspark/ml/evaluation.py",
> line 94, in _evaluate
> File
> "/Users/dominikdahlem/software/spark-1.6.0-SNAPSHOT-bin-custom-spark/python/lib/py4j-0.9-src.zip/py4j/java_gateway.py",
> line 813, in __call__
> File
> "/Users/dominikdahlem/projects/repositories/spark/python/pyspark/sql/utils.py",
> line 42, in deco
> raise IllegalArgumentException(s.split(': ', 1)[1])
> pyspark.sql.utils.IllegalArgumentException: requirement failed: Column
> prediction must be of type DoubleType but was actually FloatType.
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