156 lines
5.6 KiB
HTML
156 lines
5.6 KiB
HTML
<! $Id: nbest-pron-score.1,v 1.8 2019/09/09 22:35:37 stolcke Exp $>
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<TITLE>nbest-pron-score</TITLE>
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<H1>nbest-pron-score</H1>
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<H2> NAME </H2>
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nbest-pron-score - score pronunciations and pauses in N-best hypotheses
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<H2> SYNOPSIS </H2>
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<B>nbest-pron-score</B> [ <B>-help</B> ] <I>option</I> ...
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</PRE>
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<H2> DESCRIPTION </H2>
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<B> nbest-pron-score </B>
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reads N-best lists and computes log probability scores for the pronunciations
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and pauses contained in them.
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Pronunciation scoring requires that the N-best lists
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contain phone backtraces in "NBestList2.0"
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<A HREF="nbest-format.5.html">nbest-format(5)</A>.
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<P>
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Pronunciation scores are computed from the probabilities in a dictionary.
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Pauses are binned into three length classes (none, short, long) and
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scored according to a trigram language model that conditions the pause length
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on the left and right neighboring words, in that order (so that bigram
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backoff uses the left neighbor only).
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<H2> OPTIONS </H2>
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<P>
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Each filename argument can be an ASCII file, or a
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compressed file (name ending in .Z or .gz), or ``-'' to indicate
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stdin/stdout.
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<DL>
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<DT><B> -help </B>
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<DD>
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Print option summary.
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<DT><B> -version </B>
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<DD>
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Print version information.
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<DT><B>-debug</B><I> level</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Controls the amount of output (the higher the
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<I>level</I>,<I></I><I></I><I></I>
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the more).
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<DT><B> -tolower </B>
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<DD>
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Map all vocabulary to lowercase.
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Useful if case conventions for text/counts and language model differ.
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<DT><B> -multiwords </B>
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<DD>
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Deal with N-best lists containing multiwords joined by underscores.
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This only affects pause scoring: if a word adjacent to a pause is
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a multiword and is not in the vocabulary of the pause LM, then it is split
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and only the component closest to the pause is conditioned on.
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<DT><B>-multi-char</B><I> C</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Character used to delimit component words in multiwords
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(an underscore character by default).
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<DT><B>-nbest</B><I> file</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Score the N-best hypothese in
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<I>file</I>.<I></I><I></I><I></I>
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<DT><B>-rescore</B><I> file</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Same as
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<B>-nbest</B>.<B></B><B></B><B></B>
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<DT><B>-nbest-files</B><I> file</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Process all N-best list filenames listed in
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<I>file</I>.<I></I><I></I><I></I>
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<DT><B>-max-nbest</B><I> n</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Limits the number of hypotheses read from an N-best list.
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Only the first
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<I> n </I>
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hypotheses are processed.
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<DT><B>-dictionary</B><I> file</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Enable pronunciation scoring, using the pronunciation dictionary
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<I>file</I>.<I></I><I></I><I></I>
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Each line contains a pronunciation in the format
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<PRE>
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<I>word</I> [<I>p</I>] <I>phone</I> ...
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</PRE>
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The optional value
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<I> p </I>
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is the pronunciation probability.
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If the second field in a line is not a number the pronunciation is assumed
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to have probability one.
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<DT><B> -intlogs </B>
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<DD>
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Interpret probabilities in the dictionary as intlog-scaled log probabilities
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(as used in the SRI Decipher(TM) system), rather than straight probabilities.
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<DT><B>-pause-lm</B><I> file</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Enable pause scoring, using the pause LM in
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<I>file</I>.<I></I><I></I><I></I>
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<DT><B>-no-pause</B><I> tag</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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The word used to represent the absence of a pause in the pause LM.
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<DT><B>-short-pause</B><I> tag</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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The word used to represent a short pause in the pause LM.
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<DT><B>-long-pause</B><I> tag</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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The word used to represent a long pause in the pause LM.
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<DT><B>-min-pause-dur</B><I> T</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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The minimum duration, in seconds, for a non-speech region to be considered
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a (short) pause.
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<DT><B>-long-pause-dur</B><I> T</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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The duration, in second, above which a non-speech region is considered a
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"long" pause.
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</DD>
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</DL>
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<P>
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The default values for pause tags and duration thresholds are printed by the
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<B> -help </B>
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option.
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<DL>
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<DT><B>-pron-score-dir</B><I> dir</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Write pronunciation scores to
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<I>dir</I><I></I><I></I><I></I>
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when processing multiple N-best lists,
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using output filenames derived from the input files.
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<DT><B>-pause-score-dir</B><I> dir</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Write pause scores to
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<I>dir</I><I></I><I></I><I></I>
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when processing multiple N-best lists,
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using output filenames derived from the input files.
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<DT><B>-pause-score-weight</B><I> W</I><B></B><I></I><B></B><I></I><B></B>
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<DD>
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Add pause LM scores to the pronunciation scores after multiplying them
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by
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<I>W</I>.<I></I><I></I><I></I>
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This creates a single weighted combination of both models.
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Pause scores can still be output separately by specifying
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<B>-pause-score-dir</B>.<B></B><B></B><B></B>
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</DD>
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</DL>
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<H2> SEE ALSO </H2>
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<A HREF="nbest-format.5.html">nbest-format(5)</A>, <A HREF="nbest-scripts.1.html">nbest-scripts(1)</A>, <A HREF="nbest-optimize.1.html">nbest-optimize(1)</A>, <A HREF="ngram.1.html">ngram(1)</A>.
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<BR>
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D. Vergyri, A. Stolcke, V. R. R. Gadde, L. Ferrer, & E. Shriberg,
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``Prosodic Knowledge Sources for Automatic Speech Recognition''.
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<I>Proc. IEEE Intl. Conf. on Acoustics, Speech and Signal Processing</I>,
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Hong Kong, April 2003.
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<H2> BUGS </H2>
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The binning of pause lengths into three classes should be generalized.
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<H2> AUTHOR </H2>
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Andreas Stolcke <stolcke@icsi.berkeley.edu>.
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<BR>
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Copyright (c) 2002-2008 SRI International
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