opennlp.tools.chunker (Apache OpenNLP Tools 1.9.5 API)
Date: 2026-06-18

# Package opennlp.tools.chunker

Package related to finding non-recursive syntactic annotation such as noun phrase chunks.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  Chunker | The interface for chunkers which provide chunk tags for a sequence of tokens.
  ChunkerContextGenerator | Interface for the context generator used in syntactic chunking.
  ChunkerEvaluationMonitor |

- Class Summary
  Class | Description
  --- | ---
  ChunkerCrossValidator |
  ChunkerEvaluator | The `ChunkerEvaluator` measures the performance of the given `Chunker` with the provided reference `ChunkSample`s.
  ChunkerEventStream | Class for creating an event stream out of data files for training a chunker.
  ChunkerFactory |
  ChunkerME | The class represents a maximum-entropy-based chunker.
  ChunkerModel | The `ChunkerModel` is the model used by a learnable `Chunker`.
  ChunkSample | Class for holding chunks for a single unit of text.
  ChunkSampleSequenceStream |
  ChunkSampleStream | Parses the conll 2000 shared task shallow parser training data.
  DefaultChunkerContextGenerator | Features based on chunking model described in Fei Sha and Fernando Pereira.
  DefaultChunkerSequenceValidator |

## Package opennlp.tools.chunker Description

Package related to finding non-recursive syntactic annotation such as noun phrase chunks.

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