Java雲端運算：人工智慧與機器學習的整合

import org.apache.spark.ml.classification.LogisticRegression;
import org.apache.spark.ml.feature.VectorAssembler;
import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.SparkSession;

public class CustomerChurnPrediction {

    public static void main(String[] args) {
        SparkSession spark = SparkSession.builder().appName("CustomerChurnPrediction").getOrCreate();

        // 加载并准备数据
        Dataset df = spark.read().csv("customer_data.csv");
        df = df.withColumnRenamed("customer_id", "id");
        df = df.na().fill(0);

        // 特征工程
        VectorAssembler assembler = new VectorAssembler()
                .setInputCols(new String[] {"days_since_last_purchase", "total_purchases", "average_purchase_value"})
                .setOutputCol("features");
        df = assembler.transform(df).select("features", "churn");

        // 训练逻辑回归模型
        LogisticRegression lr = new LogisticRegression()
                .setLabelCol("churn")
                .setFeaturesCol("features");
        lr.fit(df);

        // 评估模型
        double accuracy = lr.evaluate(df).accuracy();
        System.out.println("模型准确率：" + accuracy);

        // 使用新数据进行预测
        Dataset newData = spark.read().csv("new_customer_data.csv");
        newData = newData.withColumnRenamed("customer_id", "id");
        newData = newData.na().fill(0);
        newData = assembler.transform(newData).select("features");

        Dataset predictions = lr.transform(newData).select("id", "prediction");
        predictions.show();
    }
}