Java 类名:com.alibaba.alink.operator.batch.nlp.Word2VecTrainBatchOp
Python 类名:Word2VecTrainBatchOp
功能介绍
Word2Vec是Google在2013年开源的一个将词表转为向量的算法,其利用神经网络,可以通过训练,将词映射到K维度空间向量,甚至对于表示词的向量进行操作还能和语义相对应,由于其简单和高效引起了很多人的关注。
Word2Vec的工具包相关链接:https://code.google.com/p/word2vec/
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 | ✓ | 所选列类型为 [STRING] | |
| alpha | 学习率 | 学习率 | Double | | | 0.025 |
| minCount | 最小词频 | 最小词频 | Integer | | | 5 |
| numIter | 迭代次数 | 迭代次数,默认为1。 | Integer | | | 1 |
| randomWindow | 是否使用随机窗口 | 是否使用随机窗口,默认使用 | String | | | “true” |
| vectorSize | embedding的向量长度 | embedding的向量长度 | Integer | | [1, +inf) | 100 |
| window | 窗口大小 | 窗口大小 | Integer | | | 5 |
| wordDelimiter | 单词分隔符 | 单词之间的分隔符 | String | | | “ “ |
代码示例
Python 代码
from pyalink.alink import *
import pandas as pd
useLocalEnv(1)
df = pd.DataFrame([
["A B C"]
])
inOp1 = BatchOperator.fromDataframe(df, schemaStr='tokens string')
inOp2 = StreamOperator.fromDataframe(df, schemaStr='tokens string')
train = Word2VecTrainBatchOp().setSelectedCol("tokens").setMinCount(1).setVectorSize(4).linkFrom(inOp1)
predictBatch = Word2VecPredictBatchOp().setSelectedCol("tokens").linkFrom(train, inOp1)
train.lazyPrint(-1)
predictBatch.print()
predictStream = Word2VecPredictStreamOp(train).setSelectedCol("tokens").linkFrom(inOp2)
predictStream.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.nlp.Word2VecPredictBatchOp;
import com.alibaba.alink.operator.batch.nlp.Word2VecTrainBatchOp;
import com.alibaba.alink.operator.batch.source.MemSourceBatchOp;
import com.alibaba.alink.operator.stream.StreamOperator;
import com.alibaba.alink.operator.stream.nlp.Word2VecPredictStreamOp;
import com.alibaba.alink.operator.stream.source.MemSourceStreamOp;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
public class Word2VecTrainBatchOpTest {
@Test
public void testWord2VecTrainBatchOp() throws Exception {
List <Row> df = Arrays.asList(
Row.of("A B C")
);
BatchOperator <?> inOp1 = new MemSourceBatchOp(df, "tokens string");
StreamOperator <?> inOp2 = new MemSourceStreamOp(df, "tokens string");
BatchOperator <?> train = new Word2VecTrainBatchOp().setSelectedCol("tokens").setMinCount(1).setVectorSize(4)
.linkFrom(inOp1);
BatchOperator <?> predictBatch = new Word2VecPredictBatchOp().setSelectedCol("tokens").linkFrom(train, inOp1);
train.lazyPrint(-1);
predictBatch.print();
StreamOperator <?> predictStream = new Word2VecPredictStreamOp(train).setSelectedCol("tokens").linkFrom(inOp2);
predictStream.print();
StreamOperator.execute();
}
}
运行结果
模型结果
| word | vec | | —- | —- |
| A | 0.7308596353097189 0.8314177144978963 0.24043567184236792 0.6063183430688116 |
| C | 0.7309068666584959 0.10053389527357781 0.41008241284786995 0.40747231850240395 |
| B | 0.7311470683768729 0.29342648043578945 0.9014165072579701 0.0041863689268244915 |
批预测结果
| tokens | | —- |
| 0.7309711901150291 0.40845936340242117 0.5173115306494026 0.33932567683268 |
流预测结果
| tokens | | —- |
| 0.7309691109963297 0.4083920636901659 0.5173538721894075 0.3392825036669853 |