Package org.carrot2.text.preprocessing

Class BasicPreprocessingPipeline

java.lang.Object

org.carrot2.attrs.AttrComposite

org.carrot2.text.preprocessing.BasicPreprocessingPipeline

All Implemented Interfaces:

AcceptingVisitor, ContextPreprocessor

public class BasicPreprocessingPipeline
extends AttrComposite
implements ContextPreprocessor

Performs basic preprocessing steps on the provided documents. The preprocessing consists of the following steps:

1. InputTokenizer
2. CaseNormalizer
3. LanguageModelStemmer
4. StopListMarker

Field Summary

Fields

Modifier and Type	Field	Description
protected org.carrot2.text.preprocessing.CaseNormalizer	caseNormalizer	Case normalizer used by the algorithm.
protected org.carrot2.text.preprocessing.LanguageModelStemmer	stemming	Stemmer used by the algorithm.
protected org.carrot2.text.preprocessing.StopListMarker	stopListMarker	Stop list marker used by the algorithm, contains modifiable parameters.
protected org.carrot2.text.preprocessing.InputTokenizer	tokenizer	Tokenizer used by the algorithm.
AttrInteger	wordDfThreshold	Word Document Frequency threshold.

Fields inherited from class org.carrot2.attrs.AttrComposite

attributes

Constructor Summary

Constructors

Constructor	Description
BasicPreprocessingPipeline()

Method Summary

Modifier and Type	Method	Description
PreprocessingContext	preprocess(Stream<? extends Document> documents, String query, LanguageComponents langModel)	Performs preprocessing on the provided list of documents.

Methods inherited from class org.carrot2.attrs.AttrComposite

accept

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

wordDfThreshold

public final AttrInteger wordDfThreshold

Word Document Frequency threshold. Words appearing in fewer than dfThreshold documents will be ignored.

caseNormalizer

protected final org.carrot2.text.preprocessing.CaseNormalizer caseNormalizer

Case normalizer used by the algorithm.

stemming

protected final org.carrot2.text.preprocessing.LanguageModelStemmer stemming

Stemmer used by the algorithm.

stopListMarker

protected final org.carrot2.text.preprocessing.StopListMarker stopListMarker

Stop list marker used by the algorithm, contains modifiable parameters.

tokenizer

protected final org.carrot2.text.preprocessing.InputTokenizer tokenizer

Tokenizer used by the algorithm.

Constructor Detail

BasicPreprocessingPipeline

public BasicPreprocessingPipeline()

Method Detail

preprocess

public PreprocessingContext preprocess(Stream<? extends Document> documents,
                                       String query,
                                       LanguageComponents langModel)

Performs preprocessing on the provided list of documents. Results can be obtained from the returned PreprocessingContext.

Specified by:

preprocess in interface ContextPreprocessor