37 lines
1.2 KiB
Groff
37 lines
1.2 KiB
Groff
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.\" $Id: classes-format.5,v 1.3 2007/12/19 22:08:05 stolcke Exp $
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.TH classes-format 5 "$Date: 2007/12/19 22:08:05 $" "SRILM File Formats"
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.SH NAME
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classes-format \- File format for word class definitions
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.SH SYNOPSIS
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.nf
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\fIclass\fP [\fIp\fP] \fIword1\fP \fIword2\fP ...
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.fi
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.SH DESCRIPTION
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Various programs dealing with word classes use this format to define
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the posssible expansions of classes and their respective probabilities.
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Each expansion appears on a separate line as in
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the synopsis, where
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.I class
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names a word class,
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.I p
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gives the probability for the class expansion, and
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.I "word1 word2 ..."
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defines the word string that the class expands to.
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If
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.I p
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is omitted it is assumed to be 1.
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(All expansion probabilities for a given class should sum to one,
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although this is not necessarily enforced by the software and would
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lead to improper models.)
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.PP
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Note that the concept of word class here is generalized to include
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``multi-words'', or phrases consisting of more than one word.
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All expansions must have at least one word.
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Certain models might impose more restrictive formats.
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.SH "SEE ALSO"
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ngram(1), ngram-class(1), disambig(1), training-scripts(1), pfsg-scripts(5).
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.SH AUTHOR
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Andreas Stolcke <stolcke@speech.sri.com>.
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.br
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Copyright 1999 SRI International
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