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nbest-format(5) nbest-format(5)
NNAAMMEE
nbest-format - File formats for N-best hypotheses lists
DDEESSCCRRIIPPTTIIOONN
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) recognition system, the
third format is particular to SRILM.
The first format consists of the header
NBestList1.0
followed by one or more lines of the form
(_s_c_o_r_e) _w_1 _w_2 _w_3 ...
where _s_c_o_r_e is a composite acoustic/language model score from the rec-
ognizer, 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 nnggrraamm --nnbbeesstt, and by
nnbbeesstt--llaattttiiccee --wwrriittee--nnbbeesstt --ddeecciipphheerr--nnbbeesstt.
The second Decipher(TM) format is an extension of the first format that
encodes word-level scores and time alignments. It is marked by a
header of the form
NBestList2.0
The hypotheses are in the format
(_s_c_o_r_e) _w_1 ( st: _s_t_1 et: _e_t_1 g: _g_1 a: _a_1 ) _w_2 ...
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 _w's denoting phone
and state names. Sub-word units will have time marks that are con-
tained in the duration of the preceding word units, and may thus be
easily identified.
The third format understood by SRILM lists hypotheses in the format
_a_s_c_o_r_e _l_s_c_o_r_e _n_w_o_r_d_s _w_1 _w_2 _w_3 ...
where the first three columns contain the acoustic model log probabil-
ity, 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 nnggrraamm --rreessccoorree and by nnbbeesstt--llaattttiiccee --wwrriittee--
nnbbeesstt without the --ddeecciipphheerr--nnbbeesstt option.
SSEEEE AALLSSOO
ngram(1), nbest-lattice(1), segment-nbest(1), nbest-scripts(1), pfsg-
scripts(1).
BBUUGGSS
All these formats are somewhat ad hoc and could use a more rational
design. The ``NBestList1.0'' format is particularly cumbersome because
it conflates acoustic and language model scores.
A generalization to an arbitrary number of separate scores would be
nice.
AAUUTTHHOORR
Manual page written by Andreas Stolcke <stolcke@speech.sri.com>.
Copyright 1999-2001 SRI International
SRILM File Formats $Date: 2007/12/19 22:08:05 $ nbest-format(5)