Java 类名:com.alibaba.alink.operator.batch.feature.VectorChiSqSelectorBatchOp
Python 类名:VectorChiSqSelectorBatchOp
功能介绍
针对vector数据,进行特征筛选
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 |
|---|---|---|---|---|---|---|
| labelCol | 标签列名 | 输入表中的标签列名 | String | ✓ | ||
| selectedCol | 选中的列名 | 计算列对应的列名 | String | ✓ | 所选列类型为 [DENSE_VECTOR, SPARSE_VECTOR, STRING, VECTOR] | |
| fdr | 发现阈值 | 发现阈值, 默认值0.05 | Double | 0.05 | ||
| fpr | p value的阈值 | p value的阈值,默认值0.05 | Double | 0.05 | ||
| fwe | 错误率阈值 | 错误率阈值, 默认值0.05 | Double | 0.05 | ||
| numTopFeatures | 最大的p-value列个数 | 最大的p-value列个数, 默认值50 | Integer | 50 | ||
| percentile | 筛选的百分比 | 筛选的百分比,默认值0.1 | Double | 0.1 | ||
| selectorType | 筛选类型 | 筛选类型,包含”NumTopFeatures”,”percentile”, “fpr”, “fdr”, “fwe”五种。 | String | “NumTopFeatures”, “PERCENTILE”, “FPR”, “FDR”, “FWE” | “NumTopFeatures” |
代码示例
以下代码仅用于示意,可能需要修改部分代码或者配置环境后才能正常运行!
Python 代码
无python接口
Java 代码
package javatest.com.alibaba.alink.batch.feature;import org.apache.flink.types.Row;import com.alibaba.alink.operator.batch.BatchOperator;import com.alibaba.alink.operator.batch.feature.VectorChiSqSelectorBatchOp;import com.alibaba.alink.operator.batch.source.MemSourceBatchOp;import org.junit.Test;import java.util.Arrays;public class VectorChiSqSelectorBatchOpTest {@Testpublic void testVectorChiSqSelectorBatchOp() throws Exception {Row[] testArray = new Row[] {Row.of(7, "0.0 0.0 18.0 1.0", 1.0),Row.of(8, "0.0 1.0 12.0 0.0", 0.0),Row.of(9, "1.0 0.0 15.0 0.1", 0.0),};String[] colNames = new String[] {"id", "features", "clicked"};MemSourceBatchOp source = new MemSourceBatchOp(Arrays.asList(testArray), colNames);VectorChiSqSelectorBatchOp test = new VectorChiSqSelectorBatchOp().setSelectedCol("features").setLabelCol("clicked");test.linkFrom(source);test.lazyPrintModelInfo();BatchOperator.execute();}}
运行结果
------------------------- ChisqSelectorModelInfo -------------------------Number of Selector Features: 4Number of Features: 4Type of Selector: NumTopFeaturesNumber of Top Features: 50Selector Indices:|VectorIndex|ChiSquare|PValue| DF|Selected||-----------|---------|------|---|--------|| 3| 3|0.2231| 2| true|| 2| 3|0.2231| 2| true|| 0| 0.75|0.3865| 1| true|| 1| 0.75|0.3865| 1| true|
