Java 类名:com.alibaba.alink.pipeline.feature.GbdtRegEncoder
Python 类名:GbdtRegEncoder
功能介绍
使用Gbdt回归模型,对数据进行特征转换。
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 | ✓ | ||
predictionCol | 预测结果列名 | 预测结果列名 | String | ✓ | ||
categoricalCols | 离散特征列名 | 离散特征列名 | String[] | |||
criteria | 树分裂的策略 | 树分裂的策略,可以为PAI, XGBOOST | String | “PAI”, “XGBOOST” | “PAI” | |
featureCols | 特征列名数组 | 特征列名数组,默认全选 | String[] | null | ||
featureImportanceType | 特征重要性类型 | 特征重要性类型(默认为GAIN) | String | “WEIGHT”, “GAIN”, “COVER” | “GAIN” | |
featureSubsamplingRatio | 每棵树特征采样的比例 | 每棵树特征采样的比例,范围为(0, 1]。 | Double | 1.0 | ||
gamma | xgboost中的l2正则项 | xgboost中的l2正则项 | Double | 0.0 | ||
lambda | xgboost中的l1正则项 | xgboost中的l1正则项 | Double | 0.0 | ||
learningRate | 学习率 | 学习率(默认为0.3) | Double | 0.3 | ||
maxBins | 连续特征进行分箱的最大个数 | 连续特征进行分箱的最大个数。 | Integer | 128 | ||
maxDepth | 树的深度限制 | 树的深度限制 | Integer | 6 | ||
maxLeaves | 叶节点的最多个数 | 叶节点的最多个数 | Integer | 2147483647 | ||
minInfoGain | 分裂的最小增益 | 分裂的最小增益 | Double | 0.0 | ||
minSampleRatioPerChild | 子节点占父节点的最小样本比例 | 子节点占父节点的最小样本比例 | Double | 0.0 | ||
minSamplesPerLeaf | 叶节点的最小样本个数 | 叶节点的最小样本个数 | Integer | 100 | ||
minSumHessianPerLeaf | 叶子节点最小Hessian值 | 叶子节点最小Hessian值(默认为0) | Double | 0.0 | ||
modelFilePath | 模型的文件路径 | 模型的文件路径 | String | null | ||
newtonStep | 是否使用二阶梯度 | 是否使用二阶梯度 | Boolean | true | ||
numTrees | 模型中树的棵数 | 模型中树的棵数 | Integer | 100 | ||
overwriteSink | 是否覆写已有数据 | 是否覆写已有数据 | Boolean | false | ||
reservedCols | 算法保留列名 | 算法保留列 | String[] | null | ||
subsamplingRatio | 每棵树的样本采样比例或采样行数 | 每棵树的样本采样比例或采样行数,行数上限100w行 | Double | 1.0 | ||
vectorCol | 向量列名 | 向量列对应的列名,默认值是null | String | null | ||
weightCol | 权重列名 | 权重列对应的列名 | String | 所选列类型为 [BIGDECIMAL, BIGINTEGER, BYTE, DOUBLE, FLOAT, INTEGER, LONG, SHORT] | null | |
numThreads | 组件多线程线程个数 | 组件多线程线程个数 | Integer | 1 | ||
modelStreamFilePath | 模型流的文件路径 | 模型流的文件路径 | String | null | ||
modelStreamScanInterval | 扫描模型路径的时间间隔 | 描模型路径的时间间隔,单位秒 | Integer | 10 | ||
modelStreamStartTime | 模型流的起始时间 | 模型流的起始时间。默认从当前时刻开始读。使用yyyy-mm-dd hh:mm:ss.fffffffff格式,详见Timestamp.valueOf(String s) | String | null |
代码示例
Python 代码
from pyalink.alink import *
import pandas as pd
useLocalEnv(1)
df = pd.DataFrame([
[1.0, "A", 0, 0, 0],
[2.0, "B", 1, 1, 0],
[3.0, "C", 2, 2, 1],
[4.0, "D", 3, 3, 1]
])
batchSource = BatchOperator.fromDataframe(df, schemaStr=' f0 double, f1 string, f2 int, f3 int, label int')
streamSource = StreamOperator.fromDataframe(df, schemaStr=' f0 double, f1 string, f2 int, f3 int, label int')
gbdtRegEncoderModel = GbdtRegEncoder()\
.setLabelCol('label')\
.setFeatureCols(['f0', 'f1', 'f2', 'f3'])\
.setPredictionCol("encoded_features")\
.fit(batchSource)
gbdtRegEncoderModel.transform(batchSource).print()
gbdtRegEncoderModel.transform(streamSource).print()
StreamOperator.execute()
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.operator.stream.StreamOperator;
import com.alibaba.alink.operator.stream.source.MemSourceStreamOp;
import com.alibaba.alink.pipeline.feature.GbdtRegEncoder;
import com.alibaba.alink.pipeline.feature.GbdtRegEncoderModel;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
public class GbdtRegEncoderTest {
@Test
public void testGbdtRegEncoder() throws Exception {
List <Row> df = Arrays.asList(
Row.of(1.0, "A", 0, 0, 0),
Row.of(2.0, "B", 1, 1, 0),
Row.of(3.0, "C", 2, 2, 1),
Row.of(4.0, "D", 3, 3, 1)
);
BatchOperator <?> batchSource = new MemSourceBatchOp(df, " f0 double, f1 string, f2 int, f3 int, label int");
StreamOperator <?> streamSource = new MemSourceStreamOp(df, " f0 double, f1 string, f2 int, f3 int, label "
+ "int");
GbdtRegEncoderModel gbdtRegEncoderModel = new GbdtRegEncoder()
.setLabelCol("label")
.setFeatureCols("f0", "f1", "f2", "f3")
.setPredictionCol("encoded_features")
.fit(batchSource);
gbdtRegEncoderModel.transform(batchSource).print();
gbdtRegEncoderModel.transform(streamSource).print();
StreamOperator.execute();
}
}
运行结果
| f0 | f1 | f2 | f3 | label | encoded_features | | —- | —- | —- | —- | —- | —- |
| 1.0000 | A | 0 | 0 | 0 | $120$0:1.0 2:1.0 4:1.0 6:1.0 8:1.0 10:1.0 12:1.0 14:1.0 16:1.0 18:1.0 20:1.0 22:1.0 24:1.0 26:1.0 28:1.0 30:1.0 32:1.0 34:1.0 36:1.0 38:1.0 40:1.0 41:1.0 42:1.0 43:1.0 44:1.0 45:1.0 46:1.0 47:1.0 48:1.0 49:1.0 50:1.0 51:1.0 52:1.0 53:1.0 54:1.0 55:1.0 56:1.0 57:1.0 58:1.0 59:1.0 60:1.0 61:1.0 62:1.0 63:1.0 64:1.0 65:1.0 66:1.0 67:1.0 68:1.0 69:1.0 70:1.0 71:1.0 72:1.0 73:1.0 74:1.0 75:1.0 76:1.0 77:1.0 78:1.0 79:1.0 80:1.0 81:1.0 82:1.0 83:1.0 84:1.0 85:1.0 86:1.0 87:1.0 88:1.0 89:1.0 90:1.0 91:1.0 92:1.0 93:1.0 94:1.0 95:1.0 96:1.0 97:1.0 98:1.0 99:1.0 100:1.0 101:1.0 102:1.0 103:1.0 104:1.0 105:1.0 106:1.0 107:1.0 108:1.0 109:1.0 110:1.0 111:1.0 112:1.0 113:1.0 114:1.0 115:1.0 116:1.0 117:1.0 118:1.0 119:1.0 |
| 2.0000 | B | 1 | 1 | 0 | $120$0:1.0 2:1.0 4:1.0 6:1.0 8:1.0 10:1.0 12:1.0 14:1.0 16:1.0 18:1.0 20:1.0 22:1.0 24:1.0 26:1.0 28:1.0 30:1.0 32:1.0 34:1.0 36:1.0 38:1.0 40:1.0 41:1.0 42:1.0 43:1.0 44:1.0 45:1.0 46:1.0 47:1.0 48:1.0 49:1.0 50:1.0 51:1.0 52:1.0 53:1.0 54:1.0 55:1.0 56:1.0 57:1.0 58:1.0 59:1.0 60:1.0 61:1.0 62:1.0 63:1.0 64:1.0 65:1.0 66:1.0 67:1.0 68:1.0 69:1.0 70:1.0 71:1.0 72:1.0 73:1.0 74:1.0 75:1.0 76:1.0 77:1.0 78:1.0 79:1.0 80:1.0 81:1.0 82:1.0 83:1.0 84:1.0 85:1.0 86:1.0 87:1.0 88:1.0 89:1.0 90:1.0 91:1.0 92:1.0 93:1.0 94:1.0 95:1.0 96:1.0 97:1.0 98:1.0 99:1.0 100:1.0 101:1.0 102:1.0 103:1.0 104:1.0 105:1.0 106:1.0 107:1.0 108:1.0 109:1.0 110:1.0 111:1.0 112:1.0 113:1.0 114:1.0 115:1.0 116:1.0 117:1.0 118:1.0 119:1.0 |
| 3.0000 | C | 2 | 2 | 1 | $120$1:1.0 3:1.0 5:1.0 7:1.0 9:1.0 11:1.0 13:1.0 15:1.0 17:1.0 19:1.0 21:1.0 23:1.0 25:1.0 27:1.0 29:1.0 31:1.0 33:1.0 35:1.0 37:1.0 39:1.0 40:1.0 41:1.0 42:1.0 43:1.0 44:1.0 45:1.0 46:1.0 47:1.0 48:1.0 49:1.0 50:1.0 51:1.0 52:1.0 53:1.0 54:1.0 55:1.0 56:1.0 57:1.0 58:1.0 59:1.0 60:1.0 61:1.0 62:1.0 63:1.0 64:1.0 65:1.0 66:1.0 67:1.0 68:1.0 69:1.0 70:1.0 71:1.0 72:1.0 73:1.0 74:1.0 75:1.0 76:1.0 77:1.0 78:1.0 79:1.0 80:1.0 81:1.0 82:1.0 83:1.0 84:1.0 85:1.0 86:1.0 87:1.0 88:1.0 89:1.0 90:1.0 91:1.0 92:1.0 93:1.0 94:1.0 95:1.0 96:1.0 97:1.0 98:1.0 99:1.0 100:1.0 101:1.0 102:1.0 103:1.0 104:1.0 105:1.0 106:1.0 107:1.0 108:1.0 109:1.0 110:1.0 111:1.0 112:1.0 113:1.0 114:1.0 115:1.0 116:1.0 117:1.0 118:1.0 119:1.0 |
| 4.0000 | D | 3 | 3 | 1 | $120$1:1.0 3:1.0 5:1.0 7:1.0 9:1.0 11:1.0 13:1.0 15:1.0 17:1.0 19:1.0 21:1.0 23:1.0 25:1.0 27:1.0 29:1.0 31:1.0 33:1.0 35:1.0 37:1.0 39:1.0 40:1.0 41:1.0 42:1.0 43:1.0 44:1.0 45:1.0 46:1.0 47:1.0 48:1.0 49:1.0 50:1.0 51:1.0 52:1.0 53:1.0 54:1.0 55:1.0 56:1.0 57:1.0 58:1.0 59:1.0 60:1.0 61:1.0 62:1.0 63:1.0 64:1.0 65:1.0 66:1.0 67:1.0 68:1.0 69:1.0 70:1.0 71:1.0 72:1.0 73:1.0 74:1.0 75:1.0 76:1.0 77:1.0 78:1.0 79:1.0 80:1.0 81:1.0 82:1.0 83:1.0 84:1.0 85:1.0 86:1.0 87:1.0 88:1.0 89:1.0 90:1.0 91:1.0 92:1.0 93:1.0 94:1.0 95:1.0 96:1.0 97:1.0 98:1.0 99:1.0 100:1.0 101:1.0 102:1.0 103:1.0 104:1.0 105:1.0 106:1.0 107:1.0 108:1.0 109:1.0 110:1.0 111:1.0 112:1.0 113:1.0 114:1.0 115:1.0 116:1.0 117:1.0 118:1.0 119:1.0 |