分类（Classification）

下面的例子说明了怎样导入LIBSVM 数据文件，解析成RDD[LabeledPoint]，然后使用决策树进行分类。GINI不纯度作为不纯度衡量标准并且树的最大深度设置为5。最后计算了测试错误率从而评估算法的准确性。

from pyspark.mllib.regression import LabeledPoint
from pyspark.mllib.tree import DecisionTree, DecisionTreeModel from pyspark.mllib.util import MLUtils # Load and parse the data file into an RDD of LabeledPoint. data = MLUtils.loadLibSVMFile(sc, 'data/mllib/sample_libsvm_data.txt') # Split the data into training and test sets (30% held out for testing) (trainingData, testData) = data.randomSplit([0.7, 0.3]) # Train a DecisionTree model. # Empty categoricalFeaturesInfo indicates all features are continuous. model = DecisionTree.trainClassifier(trainingData, numClasses=2, categoricalFeaturesInfo={}, impurity='gini', maxDepth=5, maxBins=32) # Evaluate model on test instances and compute test error predictions = model.predict(testData.map(lambda x: x.features)) labelsAndPredictions = testData.map(lambda lp: lp.label).zip(predictions) testErr = labelsAndPredictions.filter(lambda (v, p): v != p).count() / float(testData.count()) print('Test Error = ' + str(testErr)) print('Learned classification tree model:') print(model.toDebugString()) # Save and load model model.save(sc, "myModelPath") sameModel = DecisionTreeModel.load(sc, "myModelPath")

以下代码展示了如何载入一个LIBSVM数据文件，解析成一个LabeledPointRDD，然后使用决策树，使用Gini不纯度作为不纯度衡量指标，最大树深度是5.测试误差用来计算算法准确率。