ItemCf：相似items推荐 (ItemCfSimilarItemsRecommBatchOp)

Java 类名：com.alibaba.alink.operator.batch.recommendation.ItemCfSimilarItemsRecommBatchOp

Python 类名：ItemCfSimilarItemsRecommBatchOp

功能介绍

用itemCF模型为item推荐相似的item 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
itemCol	Item列列名	Item列列名	String	✓
recommCol	推荐结果列名	推荐结果列名	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
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([
    [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 = ItemCfTrainBatchOp()\
    .setUserCol("user")\
    .setItemCol("item")\
    .setRateCol("rating").linkFrom(data);

predictor = ItemCfSimilarItemsRecommBatchOp()\
    .setItemCol("item")\
    .setReservedCols(["item"])\
    .setK(1)\
    .setRecommCol("prediction_result");

predictor.linkFrom(model, 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.ItemCfSimilarItemsRecommBatchOp;
import com.alibaba.alink.operator.batch.recommendation.ItemCfTrainBatchOp;
import com.alibaba.alink.operator.batch.source.MemSourceBatchOp;
import org.junit.Test;

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

public class ItemCfSimilarItemsRecommBatchOpTest {
	@Test
	public void testItemCfSimilarItemsRecommBatchOp() 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 ItemCfTrainBatchOp()
			.setUserCol("user")
			.setItemCol("item")
			.setRateCol("rating").linkFrom(data);
		BatchOperator <?> predictor = new ItemCfSimilarItemsRecommBatchOp()
			.setItemCol("item")
			.setReservedCols("item")
			.setK(1)
			.setRecommCol("prediction_result");
		predictor.linkFrom(model, data).print();
	}
}

运行结果

item	prediction_result
1	{“item”:“[3]”,“similarities”:“[0.3922322702763681]”}
2	{“item”:“[3]”,“similarities”:“[0.9738412097417931]”}
3	{“item”:“[2]”,“similarities”:“[0.9738412097417931]”}
1	{“item”:“[3]”,“similarities”:“[0.3922322702763681]”}
2	{“item”:“[3]”,“similarities”:“[0.9738412097417931]”}
3	{“item”:“[2]”,“similarities”:“[0.9738412097417931]”}