Java 类名:com.alibaba.alink.pipeline.feature.Binarizer
Python 类名:Binarizer
功能介绍
给定一个阈值,将连续变量二值化(大于等于阈值转为1,小于阈值转为0)。
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 | ✓ | ||
| 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 | ||
| threshold | 二值化阈值 | 二值化阈值 | Double | 0.0 | ||
| 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 pduseLocalEnv(1)df = pd.DataFrame([[1.1, True, "2", "A"],[1.1, False, "2", "B"],[1.1, True, "1", "B"],[2.2, True, "1", "A"]])inOp = BatchOperator.fromDataframe(df, schemaStr='double double, bool boolean, number int, str string')binarizer = Binarizer().setSelectedCol("double").setThreshold(2.0)binarizer.transform(inOp).print()
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.feature.Binarizer;import org.junit.Test;import java.util.Arrays;import java.util.List;public class BinarizerTest {@Testpublic void testBinarizer() throws Exception {List <Row> df = Arrays.asList(Row.of(1.1, true, 2, "A"),Row.of(1.1, false, 2, "B"),Row.of(1.1, true, 1, "B"),Row.of(2.2, true, 1, "A"));BatchOperator <?> inOp = new MemSourceBatchOp(df, "double double, bool boolean, number int, str string");Binarizer binarizer = new Binarizer().setSelectedCol("double").setThreshold(2.0);binarizer.transform(inOp).print();}}
运行结果
| double | bool | number | str | | —- | —- | —- | —- |
| 0.0000 | true | 2 | A |
| 0.0000 | false | 2 | B |
| 0.0000 | true | 1 | B |
| 1.0000 | true | 1 | A |
