Java 类名:com.alibaba.alink.operator.stream.dataproc.vector.VectorAssemblerStreamOp
Python 类名:VectorAssemblerStreamOp
功能介绍
特征拼接组件。支持table中的多个 vector 列和数值列合并成一个vector 列。
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[] | ✓ | 所选列类型为 [DENSE_VECTOR, SPARSE_VECTOR, STRING, VECTOR] | |
| handleInvalidMethod | 处理无效值的方法 | 处理无效值的方法,可取 error, skip | String | | “ERROR”, “SKIP” | “ERROR” |
| 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 |
代码示例
Python 代码
from pyalink.alink import *
import pandas as pd
useLocalEnv(1)
df = pd.DataFrame([
[2, 1, 1],
[3, 2, 1],
[4, 3, 2],
[2, 4, 1],
[2, 2, 1],
[4, 3, 2],
[1, 2, 1],
[5, 3, 3]
])
data = StreamOperator.fromDataframe(df, schemaStr="f0 int, f1 int, f2 int")
colnames = ["f0","f1","f2"]
VectorAssemblerStreamOp().setSelectedCols(colnames)\
.setOutputCol("out").linkFrom(data).print()
StreamOperator.execute()
Java 代码
import org.apache.flink.types.Row;
import com.alibaba.alink.operator.stream.StreamOperator;
import com.alibaba.alink.operator.stream.dataproc.vector.VectorAssemblerStreamOp;
import com.alibaba.alink.operator.stream.source.MemSourceStreamOp;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
public class VectorAssemblerStreamOpTest {
@Test
public void testVectorAssemblerStreamOp() throws Exception {
List <Row> df = Arrays.asList(
Row.of(2, 1, 1),
Row.of(3, 2, 1),
Row.of(4, 3, 2),
Row.of(2, 4, 1),
Row.of(2, 2, 1),
Row.of(4, 3, 2),
Row.of(1, 2, 1),
Row.of(5, 3, 3)
);
StreamOperator <?> data = new MemSourceStreamOp(df, "f0 int, f1 int, f2 int");
new VectorAssemblerStreamOp().setSelectedCols("f0", "f1", "f2")
.setOutputCol("out").linkFrom(data).print();
StreamOperator.execute();
}
}
运行结果
| f0 | f1 | f2 | out | | —- | —- | —- | —- |
| 2 | 1 | 1 | 2.0,1.0,1.0 |
| 3 | 2 | 1 | 3.0,2.0,1.0 |
| 4 | 3 | 2 | 4.0,3.0,2.0 |
| 2 | 4 | 1 | 2.0,4.0,1.0 |
| 2 | 2 | 1 | 2.0,2.0,1.0 |
| 4 | 3 | 2 | 4.0,3.0,2.0 |
| 1 | 2 | 1 | 1.0,2.0,1.0 |
| 5 | 3 | 3 | 5.0,3.0,3.0 |