IndexToString预测 (IndexToStringPredictStreamOp)

Java 类名:com.alibaba.alink.operator.stream.dataproc.IndexToStringPredictStreamOp

Python 类名:IndexToStringPredictStreamOp

功能介绍

基于 StringIndexer 模型,将一列整数映射为字符串。

在流式预测中,IndexToStringPredictStreamOp 在创建对象时,需要指定模型数据
(StringIndexer的getModelData()获取,或者直接输入StringIndexerTrainBatchOp)。
在LinkFrom中指定流式数据。

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
modelName 模型名字 模型名字 String
selectedCol 选中的列名 计算列对应的列名 String 所选列类型为 [LONG]
modelFilePath 模型的文件路径 模型的文件路径 String null
outputCol 输出结果列 输出结果列列名,可选,默认null String null
reservedCols 算法保留列名 算法保留列 String[] null
numThreads 组件多线程线程个数 组件多线程线程个数 Integer 1
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

Python 代码

from pyalink.alink import *

import pandas as pd

useLocalEnv(1)

df_data = pd.DataFrame([
    ["football"],
    ["football"],
    ["football"],
    ["basketball"],
    ["basketball"],
    ["tennis"],
])

train_data = BatchOperator.fromDataframe(df_data, schemaStr='f0 string')
data = StreamOperator.fromDataframe(df_data, schemaStr='f0 string')

stringIndexer = StringIndexer() \
    .setModelName("string_indexer_model") \
    .setSelectedCol("f0") \
    .setOutputCol("f0_indexed") \
    .setStringOrderType("frequency_asc").fit(train_data)

indexed = stringIndexer.transform(data)

indexToStrings = IndexToStringPredictStreamOp(stringIndexer.getModelData()) \
    .setSelectedCol("f0_indexed") \
    .setOutputCol("f0_indxed_unindexed")

indexToStrings.linkFrom(indexed).print()
StreamOperator.execute()

Java 代码

import org.apache.flink.types.Row;

import com.alibaba.alink.operator.batch.BatchOperator;
import com.alibaba.alink.operator.batch.source.MemSourceBatchOp;
import com.alibaba.alink.operator.stream.StreamOperator;
import com.alibaba.alink.operator.stream.dataproc.IndexToStringPredictStreamOp;
import com.alibaba.alink.operator.stream.source.MemSourceStreamOp;
import com.alibaba.alink.pipeline.dataproc.StringIndexer;
import com.alibaba.alink.pipeline.dataproc.StringIndexerModel;
import org.junit.Test;

import java.util.Arrays;
import java.util.List;

public class IndexToStringPredictStreamOpTest {
	@Test
	public void testIndexToStringPredictStreamOp() throws Exception {
		List <Row> df_data = Arrays.asList(
			Row.of("football"),
			Row.of("football"),
			Row.of("football"),
			Row.of("basketball"),
			Row.of("basketball"),
			Row.of("tennis")
		);
		BatchOperator <?> train_data = new MemSourceBatchOp(df_data, "f0 string");
		StreamOperator <?> data = new MemSourceStreamOp(df_data, "f0 string");
		StringIndexerModel stringIndexer = new StringIndexer()
			.setModelName("string_indexer_model")
			.setSelectedCol("f0")
			.setOutputCol("f0_indexed")
			.setStringOrderType("frequency_asc").fit(train_data);
		StreamOperator indexed = stringIndexer.transform(data);
		StreamOperator <?> indexToStrings = new IndexToStringPredictStreamOp(stringIndexer.getModelData())
			.setSelectedCol("f0_indexed")
			.setOutputCol("f0_indxed_unindexed");
		indexToStrings.linkFrom(indexed).print();
		StreamOperator.execute();
	}
}

运行结果

f0 f0_indexed f0_indxed_unindexed
football 2 football
football 2 football
football 2 football
basketball 1 basketball
basketball 1 basketball
tennis 0 tennis