//.setSubsamplingRate(1.0) // TODO: 4. 构建Pipeline管道,设置Stage,每个Stage要么是算法(模型学习器Estimator),要么是模型(转换器Transformer) val pipeline: Pipeline = new Pipeline() // 设置Stage,依赖顺序 .setStages( Array(labelIndexer, featureIndexer, rf) ) val paramGrid: Array[ParamMap] = new...