Class SymmetricProximateTokensTemplate
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object --+
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BrillTemplateI --+
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SymmetricProximateTokensTemplate
Simulates two ProximateTokensTemplates which are symmetric across the
location of the token. For rules of the form "If the nth token is tagged A, and any tag
preceding or following the nth token by a
distance between x and y is
B, and ... , then change the tag of the nth token from
A to C."
One ProximateTokensTemplate is formed by passing in the
same arguments given to this class's constructor: tuples representing
intervals in which a tag may be found. The other
ProximateTokensTemplate is constructed with the negative of
all the arguments in reversed order. For example, a
SymmetricProximateTokensTemplate using the pair (-2,-1) and
the constructor ProximateTagsTemplate generates the same
rules as a ProximateTagsTemplate using (-2,-1) plus a second
ProximateTagsTemplate using (1,2).
This is useful because we typically don't want templates to specify
only "following" or only "preceding"; we'd like our
rules to be able to look in either direction.
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__init__(self,
rule_class,
*boundaries)
Construct a template for generating proximate token brill rules. |
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list of ProximateTokensRule
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Set
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get_neighborhood(self,
tokens,
index)
Returns the set of indices i such that
applicable_rules(token, index, ...) depends on the value
of the ith subtoken of token. |
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Inherited from object:
__delattr__,
__getattribute__,
__hash__,
__new__,
__reduce__,
__reduce_ex__,
__repr__,
__setattr__,
__str__
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__init__(self,
rule_class,
*boundaries)
(Constructor)
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Construct a template for generating proximate token brill rules.
- Parameters:
rule_class (class) - The proximate token brill rule class that should be used to
generate new rules. This class must be a subclass of ProximateTokensRule.boundaries (tuple of (int, int)) - A list of tuples (start, end), each of which
specifies a range for which a condition should be created by each
rule. - Raises:
ValueError - If start>end for any boundary. - Overrides:
BrillTemplateI.__init__
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Returns the set of indices i such that
applicable_rules(token, index, ...) depends on the value of
the ith subtoken of token.
This method is used by the "fast" Brill tagger trainer.
- Returns:
Set
- Overrides:
BrillTemplateI.get_neighborhood
- (inherited documentation)
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