KerasSequential回归预测 (KerasSequentialRegressorPredictStreamOp)

Java 类名:com.alibaba.alink.operator.stream.regression.KerasSequentialRegressorPredictStreamOp

Python 类名:KerasSequentialRegressorPredictStreamOp

功能介绍

与 KerasSequential 回归训练组件对应的流预测组件。

参数说明

名称 中文名称 描述 类型 是否必须? 取值范围 默认值
predictionCol 预测结果列名 预测结果列名 String
inferBatchSize 推理数据批大小 推理数据批大小 Integer 256
modelFilePath 模型的文件路径 模型的文件路径 String null
reservedCols 算法保留列名 算法保留列 String[] null
modelStreamFilePath 模型流的文件路径 模型流的文件路径 String null
modelStreamScanInterval 扫描模型路径的时间间隔 描模型路径的时间间隔,单位秒 Integer 10
modelStreamStartTime 模型流的起始时间 模型流的起始时间。默认从当前时刻开始读。使用yyyy-mm-dd hh:mm:ss.fffffffff格式,详见Timestamp.valueOf(String s) String null

代码示例

** 以下代码仅用于示意,可能需要修改部分代码或者配置环境后才能正常运行!**

Python 代码

source = CsvSourceBatchOp() \
    .setFilePath("https://alink-release.oss-cn-beijing.aliyuncs.com/data-files/random_tensor.csv") \
    .setSchemaStr("tensor string, label double")

source = ToTensorBatchOp() \
    .setSelectedCol("tensor") \
    .setTensorDataType("DOUBLE") \
    .setTensorShape([200, 3]) \
    .linkFrom(source)

streamSource = CsvSourceStreamOp() \
    .setFilePath("https://alink-release.oss-cn-beijing.aliyuncs.com/data-files/random_tensor.csv") \
    .setSchemaStr("tensor string, label double")

trainBatchOp = KerasSequentialRegressorTrainBatchOp() \
    .setTensorCol("tensor") \
    .setLabelCol("label") \
    .setLayers([
        "Conv1D(256, 5, padding='same', activation='relu')",
        "Conv1D(128, 5, padding='same', activation='relu')",
        "Dropout(0.1)",
        "MaxPooling1D(pool_size=8)",
        "Conv1D(128, 5, padding='same', activation='relu')",
        "Conv1D(128, 5, padding='same', activation='relu')",
        "Flatten()"
    ]) \
    .setOptimizer("Adam()") \
    .setNumEpochs(1) \
    .linkFrom(source)

predictStreamOp = KerasSequentialRegressorPredictStreamOp(trainBatchOp) \
    .setPredictionCol("pred") \
    .setReservedCols(["label"]) \
    .linkFrom(streamSource)
predictStreamOp.print()
StreamOperator.execute()

Java 代码

import com.alibaba.alink.operator.batch.BatchOperator;
import com.alibaba.alink.operator.batch.dataproc.ToTensorBatchOp;
import com.alibaba.alink.operator.batch.regression.KerasSequentialRegressorTrainBatchOp;
import com.alibaba.alink.operator.batch.source.CsvSourceBatchOp;
import com.alibaba.alink.operator.stream.StreamOperator;
import com.alibaba.alink.operator.stream.regression.KerasSequentialRegressorPredictStreamOp;
import com.alibaba.alink.operator.stream.source.CsvSourceStreamOp;
import org.junit.Test;

public class KerasSequentialRegressorPredictStreamOpTest {

	@Test
	public void testKerasSequentialRegressorPredictStreamOp() throws Exception {
		BatchOperator <?> source = new CsvSourceBatchOp()
			.setFilePath("https://alink-release.oss-cn-beijing.aliyuncs.com/data-files/random_tensor.csv")
			.setSchemaStr("tensor string, label double");

		source = new ToTensorBatchOp()
			.setSelectedCol("tensor")
			.setTensorDataType("DOUBLE")
			.setTensorShape(200, 3)
			.linkFrom(source);

		StreamOperator <?> streamSource = new CsvSourceStreamOp()
			.setFilePath("https://alink-release.oss-cn-beijing.aliyuncs.com/data-files/random_tensor.csv")
			.setSchemaStr("tensor string, label double");

		KerasSequentialRegressorTrainBatchOp trainBatchOp = new KerasSequentialRegressorTrainBatchOp()
			.setTensorCol("tensor")
			.setLabelCol("label")
			.setLayers(new String[] {
				"Conv1D(256, 5, padding='same', activation='relu')",
				"Conv1D(128, 5, padding='same', activation='relu')",
				"Dropout(0.1)",
				"MaxPooling1D(pool_size=8)",
				"Conv1D(128, 5, padding='same', activation='relu')",
				"Conv1D(128, 5, padding='same', activation='relu')",
				"Flatten()"
			})
			.setOptimizer("Adam()")
			.setNumEpochs(1)
			.linkFrom(source);

		KerasSequentialRegressorPredictStreamOp predictStreamOp = new KerasSequentialRegressorPredictStreamOp(trainBatchOp)
			.setPredictionCol("pred")
			.setReservedCols("label")
			.linkFrom(streamSource);
		predictStreamOp.print();
		StreamOperator.execute();
	}
}

运行结果

label pred pred_detail
0 0 {“0”:0.636155836712713,“1”:0.36384416328728697}
1 0 {“0”:0.6334926095655181,“1”:0.3665073904344819}
1 0 {“0”:0.6381823204965642,“1”:0.3618176795034358}
1 0 {“0”:0.6376416296248051,“1”:0.362358370375195}
1 0 {“0”:0.6345856985385896,“1”:0.36541430146141035}
1 0 {“0”:0.6357593109428179,“1”:0.364240689057182}
0 0 {“0”:0.6404387449594703,“1”:0.3595612550405296}
1 0 {“0”:0.6372702905549685,“1”:0.36272970944503136}
0 0 {“0”:0.635502012172225,“1”:0.36449798782777487}
0 0 {“0”:0.6262401788033837,“1”:0.37375982119661644}