UserCf：相似users推荐 (UserCfSimilarUsersRecommender)

Java 类名：com.alibaba.alink.pipeline.recommendation.UserCfSimilarUsersRecommender

Python 类名：UserCfSimilarUsersRecommender

功能介绍

用UserCF模型为user推荐相似的user list。

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
recommCol	推荐结果列名	推荐结果列名	String	✓
userCol	User列列名	User列列名	String	✓
initRecommCol	初始推荐列列名	初始推荐列列名	String		所选列类型为 [M_TABLE, STRING]	null
k	推荐TOP数量	推荐TOP数量	Integer			10
modelFilePath	模型的文件路径	模型的文件路径	String			null
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
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_data = pd.DataFrame([
    [1, 1, 0.6],
    [2, 2, 0.8],
    [2, 3, 0.6],
    [4, 1, 0.6],
    [4, 2, 0.3],
    [4, 3, 0.4],
])

data = BatchOperator.fromDataframe(df_data, schemaStr='user bigint, item bigint, rating double')

model = UserCfTrainBatchOp()\
    .setUserCol("user")\
    .setItemCol("item")\
    .setRateCol("rating").linkFrom(data);

predictor = UserCfSimilarUsersRecommender()\
    .setUserCol("user")\
    .setReservedCols(["user"])\
    .setK(1)\
    .setRecommCol("prediction_result")\
    .setModelData(model)

predictor.transform(data).print()

Java 代码

import org.apache.flink.types.Row;

import com.alibaba.alink.operator.batch.BatchOperator;
import com.alibaba.alink.operator.batch.recommendation.UserCfTrainBatchOp;
import com.alibaba.alink.operator.batch.source.MemSourceBatchOp;
import com.alibaba.alink.pipeline.recommendation.UserCfSimilarUsersRecommender;
import org.junit.Test;

import java.util.Arrays;
import java.util.List;

public class UserCfSimilarUsersRecommenderTest {
	@Test
	public void testUserCfSimilarUsersRecommender() throws Exception {
		List <Row> df_data = Arrays.asList(
			Row.of(1, 1, 0.6),
			Row.of(2, 2, 0.8),
			Row.of(2, 3, 0.6),
			Row.of(4, 1, 0.6),
			Row.of(4, 2, 0.3),
			Row.of(4, 3, 0.4)
		);
		BatchOperator <?> data = new MemSourceBatchOp(df_data, "user int, item int, rating double");
		BatchOperator <?> model = new UserCfTrainBatchOp()
			.setUserCol("user")
			.setItemCol("item")
			.setRateCol("rating").linkFrom(data);
		UserCfSimilarUsersRecommender predictor = new UserCfSimilarUsersRecommender()
			.setUserCol("user")
			.setReservedCols("user")
			.setK(1)
			.setRecommCol("prediction_result")
			.setModelData(model);
		predictor.transform(data).print();
	}
}

运行结果

user	prediction_result
1	{“user”:“[4]”,“similarities”:“[0.7682212795973759]”}
2	{“user”:“[4]”,“similarities”:“[0.6145770236779007]”}
2	{“user”:“[4]”,“similarities”:“[0.6145770236779007]”}
4	{“user”:“[1]”,“similarities”:“[0.7682212795973759]”}
4	{“user”:“[1]”,“similarities”:“[0.7682212795973759]”}
4	{“user”:“[1]”,“similarities”:“[0.7682212795973759]”}