| Name | Description | Type | Package | Framework |
| DefaultPOSContextGenerator | A context generator for the POS Tagger. | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| DefaultPOSSequenceValidator | | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| MutableTagDictionary | Interface that allows TagDictionary entries to be added and removed. | Interface | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSContextGenerator | The interface for a context generator for the POS Tagger. | Interface | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSDictionary | Provides a means of determining which tags are valid for a particular word based on a tag dictionary read from a file. | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSDictionaryWriter | Class for writing a pos-tag-dictionary to a file. | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSEvaluator | The POSEvaluator measures the performance of the given POSTagger with the provided reference | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSModel | The POSModel is the model used by a learnable POSTagger. | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSSample | Represents an pos-tagged sentence. | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSSampleEventStream | This class reads the POSSamples from the given Iterator and converts the POSSamples into Events which | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSSampleSequenceStream | | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSTagger | The interface for part of speech taggers. | Interface | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSTaggerCrossValidator | | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSTaggerFactory | | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| POSTaggerME | A part-of-speech tagger that uses maximum entropy. | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| TagDictionary | Interface to determine which tags are valid for a particular word based on a tag dictionary. | Interface | opennlp.tools.postag | Natural Language Processing (OpenNLP) |
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| WordTagSampleStream | A stream filter which reads a sentence per line which contains words and tags in word_tag format and outputs a POSSample objects. | Class | opennlp.tools.postag | Natural Language Processing (OpenNLP) |