向量元素两两相乘 (VectorInteraction)

Java 类名：com.alibaba.alink.pipeline.dataproc.vector.VectorInteraction

Python 类名：VectorInteraction

功能介绍

对两个vector 中的元素两两相乘，并组成一个新的向量。

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
outputCol	输出结果列列名	输出结果列列名，必选	String	✓
selectedCols	选择的列名	计算列对应的列名列表	String[]	✓
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

备注：选择列的数目必须为两列

代码示例

Python 代码

from pyalink.alink import *

import pandas as pd

useLocalEnv(1)

df = pd.DataFrame([
    ["$8$1:3,2:4,4:7", "$8$1:3,2:4,4:7"],
    ["$8$0:3,5:5", "$8$1:2,2:4,4:7"],
    ["$8$2:4,4:5", "$8$1:3,2:3,4:7"]
])
data = BatchOperator.fromDataframe(df, schemaStr="vec1 string, vec2 string")
vecInter = VectorInteraction().setSelectedCols(["vec1","vec2"]).setOutputCol("vec_product")
vecInter.transform(data).collectToDataframe()

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.pipeline.dataproc.vector.VectorInteraction;
import org.junit.Test;

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

public class VectorInteractionTest {
	@Test
	public void testVectorInteraction() throws Exception {
		List <Row> df = Arrays.asList(
			Row.of("$8$1:3,2:4,4:7", "$8$1:3,2:4,4:7"),
			Row.of("$8$0:3,5:5", "$8$1:2,2:4,4:7"),
			Row.of("$8$2:4,4:5", "$8$1:3,2:3,4:7")
		);
		BatchOperator <?> data = new MemSourceBatchOp(df, "vec1 string, vec2 string");
		VectorInteraction vecInter = new VectorInteraction().setSelectedCols("vec1", "vec2").setOutputCol(
			"vec_product");
		vecInter.transform(data).print();
	}
}

运行结果

vec1	vec2	vec_product
$8$1:3,2:4,4:7	$8$1:3,2:4,4:7	$64$9:9.0 10:12.0 12:21.0 17:12.0 18:16.0 20:28.0 33:21.0 34:28.0 36:49.0
$8$0:3,5:5	$8$1:2,2:4,4:7	$64$8:6.0 13:10.0 16:12.0 21:20.0 32:21.0 37:35.0
$8$2:4,4:5	$8$1:3,2:3,4:7	$64$10:12.0 12:15.0 18:12.0 20:15.0 34:28.0 36:35.0