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我使用logistic回归和spark-ml管道训练一个简单的CrossValidatorModel。我可以预测新的数据,但我想超越的黑盒子,做系数如何获得spark-ml CrossValidatorModel中最佳逻辑回归的系数?
val lr = new LogisticRegression().
setFitIntercept(true).
setMaxIter(maxIter).
setElasticNetParam(alpha).
setStandardization(true).
setFamily("binomial").
setWeightCol("weight").
setFeaturesCol("features").
setLabelCol("response")
val assembler = new VectorAssembler().
setInputCols(Array("feat1", "feat2")).
setOutputCol("features")
val modelPipeline = new Pipeline().
setStages(Array(assembler,lr))
val evaluator = new BinaryClassificationEvaluator()
.setLabelCol("response")
然后我定义的参数网格的一些分析,我训练在网格上,以获得最佳的模型WRT AUC
val paramGrid = new ParamGridBuilder().
addGrid(lr.regParam, lambdas).
build()
val pipeline = new CrossValidator().
setEstimator(modelPipeline).
setEvaluator(evaluator).
setEstimatorParamMaps(paramGrid).
setNumFolds(nfolds)
val cvModel = pipeline.fit(train)
如何获得最佳逻辑回归模型的系数(贝塔)?