nbest-format.5

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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 hypoth-
       esis  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 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  Deci-
       pher(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 contained 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  probability,  the language model log probability, and
       the number of words  in  the  hypothesis  string,  respec-
       tively.   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--llaatt--
       ttiiccee --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  particu-
       larly  cumbersome  because  it conflates acoustic and lan-
       guage model scores.
       A generalization to an arbitrary number of separate scores
       would be nice.

AAUUTTHHOORR
       Manual    page   written   by   Andreas   Stolcke   <stol-
       [e-mail]>.
       Copyright 1999-2001 SRI International



SRILM File Formats $Date: 2001/08/11 20:03:03 $   nbest-format(5)