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<! $Id: nbest-format.5,v 1.4 2001/08/11 20:03:03 stolcke Exp $><HTML><HEADER><TITLE>nbest-format</TITLE><BODY><H1>nbest-format</H1><H2> NAME </H2>nbest-format - File formats for N-best hypotheses lists<H2> DESCRIPTION </H2>SRILM currently understands three different formats for lists of N-best hypotheses for rescoring or 1-best hypothesis extraction.The first two formats originated in the SRI Decipher(TM) recognitionsystem, the third format is particular to SRILM.<P>The first format consists of the header<BR> NBestList1.0<BR>followed by one or more lines of the form<BR> (<I>score</I>) <I>w1 w2 w3</I> ...<BR>where<I> score </I>is a composite acoustic/language model scorefrom the recognizer, on the bytelog scale.(A bytelog is a logarithm to base 1.0001, divided by 1024 and rounded to an integer.)This format is output by the SRI Decipher(TM) recognizer,by the<B>ngram -nbest</B>,<B></B>and by<B>nbest-lattice -write-nbest -decipher-nbest</B>.<B></B><P>The second Decipher(TM) format is an extension of the first formatthat encodes word-level scores and time alignments.It is marked by a header of the form<BR> NBestList2.0<BR>The hypotheses are in the format<BR> (<I>score</I>) <I>w1</I> ( st: <I>st1</I> et: <I>et1</I> g: <I>g1</I> a: <I>a1</I> ) <I>w2</I> ...<BR>where words are followed by start and end times, language model and acoustic scores (bytelog-scaled), respectively. This format may also contain scores and time marks for sub-word units(phones and HMM states), in the same format as above, but with the<I>w</I>'s<I></I>denoting phone and state names. Sub-word units will have time marks that are contained in the duration of the preceding word units,and may thus be easily identified.<P>The third format understood by SRILM listshypotheses in the format<BR> <I>ascore</I> <I>lscore</I> <I>nwords</I> <I>w1 w2 w3</I> ...<BR>where the first three columns contain theacoustic model log probability, the language model log probability,and the number of words in the hypothesis string, respectively.All scores are logarithms base 10.(This format must not be preceded by an ``NBestList'' header.)This format is output by the<B> ngram -rescore </B>and by<B> nbest-lattice -write-nbest </B>without the<B> -decipher-nbest </B>option.<H2> SEE ALSO </H2><A HREF="ngram.html">ngram(1)</A>, <A HREF="nbest-lattice.html">nbest-lattice(1)</A>, <A HREF="segment-nbest.html">segment-nbest(1)</A>, <A HREF="nbest-scripts.html">nbest-scripts(1)</A>, <A HREF="pfsg-scripts.html">pfsg-scripts(1)</A>.<H2> BUGS </H2>All these formats are somewhat ad hoc and could use a more rationaldesign.The ``NBestList1.0'' format is particularly cumbersome because it conflates acoustic and language model scores.<BR>A generalization to an arbitrary number of separate scores would be nice.<H2> AUTHOR </H2>Manual page written by Andreas Stolcke <stolcke@speech.sri.com>.<BR>Copyright 1999-2001 SRI International</BODY></HTML>⌨️ 快捷键说明
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