Java 类名:com.alibaba.alink.operator.stream.dataproc.TensorToVectorStreamOp
Python 类名:TensorToVectorStreamOp
功能介绍
转换张量类型为向量类型。
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 | | —- | —- | —- | —- | —- | —- | —- |
| selectedCol | 选中的列名 | 计算列对应的列名 | String | ✓ | 所选列类型为 [DOUBLE_TENSOR, FLOAT_TENSOR, INT_TENSOR, LONG_TENSOR] | |
| convertMethod | 转换方法 | 张量转换为向量的方法,可取 flatten, sum, mean, max, min. | String | | “FLATTEN”, “SUM”, “MEAN”, “MAX”, “MIN” | “FLATTEN” |
| 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 |
代码示例
Python 代码
from pyalink.alink import *
import pandas as pd
useLocalEnv(1)
df_data = pd.DataFrame([
['DOUBLE#6#0.0 0.1 1.0 1.1 2.0 2.1']
])
stream_data = StreamOperator.fromDataframe(df_data, schemaStr = 'tensor string')
stream_data.link(TensorToVectorStreamOp().setSelectedCol("tensor")).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.source.MemSourceStreamOp;
import org.junit.Test;
import java.util.Collections;
import java.util.List;
public class TensorToVectorStreamOpTest {
@Test
public void testTensorToVectorStreamOp() throws Exception {
List <Row> data = Collections.singletonList(Row.of("DOUBLE#6#0.0 0.1 1.0 1.1 2.0 2.1"));
MemSourceStreamOp memSourceStreamOp = new MemSourceStreamOp(data, "tensor string");
memSourceStreamOp
.link(
new TensorToVectorStreamOp()
.setSelectedCol("tensor")
)
.print();
StreamOperator.execute();
}
}
运行结果
| tensor | | —- |
| 0.0 0.1 1.0 1.1 2.0 2.1 |