spark 从RDD createDataFrame 的坑

Scala：

import org.apache.spark.ml.linalg.Vectors val data = Seq( (7, Vectors.dense(0.0, 0.0, 18.0, 1.0), 1.0), (8, Vectors.dense(0.0, 1.0, 12.0, 0.0), 0.0), (9, Vectors.dense(1.0, 0.0, 15.0, 0.1), 0.0) ) val df = spark.createDataset(data).toDF("id", "features", "clicked") 

Python：

from pyspark.ml.linalg import Vectors df = spark.createDataFrame([ (7, Vectors.dense([0.0, 0.0, 18.0, 1.0]), 1.0,), (8, Vectors.dense([0.0, 1.0, 12.0, 0.0]), 0.0,), (9, Vectors.dense([1.0, 0.0, 15.0, 0.1]), 0.0,)], ["id", "features", "clicked"]) 
如果是pair rdd则：

    stratified_CV_data = training_data.union(test_data) #pair rdd
    #schema = StructType([
    #   StructField("label", IntegerType(), True),
    #   StructField("features", VectorUDT(), True)])
    vectorized_CV_data = sqlContext.createDataFrame(stratified_CV_data, ["label", "features"]) #,schema) 

因为spark交叉验证的数据集必须是data frame，也是醉了！