nltk.tag.crf.CRFInfo.WeightGroup

A configuration object used by MalletCRF to specify how input-features (which are a function of only the input) should be mapped to joint-features (which are a function of both the input and the output tags).

Each weight group specifies that a given set of input features should be paired with all transitions from a given set of source tags to a given set of destination tags.

init(self, name, src, dst, features=`'.'`)
(Constructor)*

source code

x.__init__(...) initializes x; see x.__class__.__doc__ for signature

Parameters:

name - A unique name for this weight group.
src - The set of source tags that should be used for this weight group, specified as either a list of state names or a regular expression.
dst - The set of destination tags that should be used for this weight group, specified as either a list of state names or a regular expression.
features - The set of input feature that should be used for this weight group, specified as either a list of feature names or a regular expression. WARNING: currently, this regexp is passed streight to java -- i.e., it must be a java-style regexp!

Overrides: object.__init__

_XML_TEMPLATE

Value:

'    <weightGroup name="%(name)s" src="%(src)s" dst="%(dst)s" features
="%(features)s" />'

Class WeightGroup

__init__(self, name, src, dst, features='.*') (Constructor)

_XML_TEMPLATE

init(self, name, src, dst, features=`'.'`)
(Constructor)*