org.datavec.nlp.vectorizer.AbstractTfidfVectorizer Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.datavec.nlp.vectorizer;
import org.datavec.api.conf.Configuration;
import org.datavec.api.records.Record;
import org.datavec.api.records.reader.RecordReader;
import org.datavec.nlp.tokenization.tokenizer.Tokenizer;
import org.datavec.nlp.tokenization.tokenizerfactory.DefaultTokenizerFactory;
import org.datavec.nlp.tokenization.tokenizerfactory.TokenizerFactory;
import java.util.HashSet;
import java.util.Set;
/**
* Tf idf vectorizer
* @author Adam Gibson
*/
public abstract class AbstractTfidfVectorizer extends TextVectorizer {
@Override
public void doWithTokens(Tokenizer tokenizer) {
Set seen = new HashSet<>();
while (tokenizer.hasMoreTokens()) {
String token = tokenizer.nextToken();
if (!stopWords.contains(token)) {
cache.incrementCount(token);
if (!seen.contains(token)) {
cache.incrementDocCount(token);
}
seen.add(token);
}
}
}
@Override
public TokenizerFactory createTokenizerFactory(Configuration conf) {
String clazz = conf.get(TOKENIZER, DefaultTokenizerFactory.class.getName());
try {
Class tokenizerFactoryClazz =
(Class) Class.forName(clazz);
return tokenizerFactoryClazz.newInstance();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public abstract VECTOR_TYPE createVector(Object[] args);
@Override
public abstract VECTOR_TYPE fitTransform(RecordReader reader);
@Override
public abstract VECTOR_TYPE transform(Record record);
}