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A processing interface for identifying non-overlapping groups in
unrestricted text. Typically, chunk parsers are used to find base
syntactic constituents, such as base noun phrases. Unlike
``ParserI``, ``ChunkParserI`` guarantees that the ``parse()`` method
will always generate a parse.
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Return the best chunk structure for the given tokens
and return a tree.
:param tokens: The list of (word, tag) tokens to be chunked.
:type tokens: list(tuple)
:rtype: Tree
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Score the accuracy of the chunker against the gold standard.
Remove the chunking the gold standard text, rechunk it using
the chunker, and return a ``ChunkScore`` object
reflecting the performance of this chunk parser.
:type gold: list(Tree)
:param gold: The list of chunked sentences to score the chunker on.
:rtype: ChunkScore
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