[Kaldi-developers] Errors when training mono-state NN in SWBD recipe

[Xavier A. <xan...@gm...>]

Dear all,
I am encounering a problem when training mono-state NN using a recipe
adapted from the SWBD S5 recipe. I am able to train, decode and phone-align
a GMM system, but when I use these results to train the NN I get the
following error (see below). I have used this recipe in the past to
successfully train one ASR system and now the only difference is that I am
trying to train a similar system using graphemes are phonemes (for which I
have assigned the graphemes of the words as transcriptions to each word).
Any help is appreciated.

This is the beginning of the file exp/mono/graph/mkgraph_phn.log:

# utils/mkgraph.sh --mono data/lang_test_phn-mono exp/mono
exp/mono/graph_phn
# Started at Fri Dec 27 18:57:19 CET 2013
#
fsttablecompose data/lang_test_phn-mono/L_disambig.fst
data/lang_test_phn-mono/G.fst
fstdeterminizestar --use-log=true
fstminimizeencoded
fstisstochastic data/lang_test_phn-mono/tmp/LG.fst
0.000358155 -0.000356635
fstcomposecontext --context-size=1 --central-position=0
--read-disambig-syms=data/lang_test_phn-mono/phones/disambig.int--write-disambig-syms=data/lang_test_
phn-mono/tmp/disambig_ilabels_1_0.intdata/lang_test_phn-mono/tmp/ilabels_1_0
fstcomposecontext: ../fstext/context-fst-inl.h:105:
fst::ContextFstImpl<Arc, LabelT>::ContextFstImpl(typename Arc::Label, const
std::vector<B, std::allocator<
_T2> >&, const std::vector<B, std::allocator<_T2> >&, int, int) [with Arc =
fst::ArcTpl<fst::TropicalWeightTpl<float> >, LabelT = int]: Assertion
`subsequenti
al_symbol != 0 && disambig_syms_.count(subsequential_symbol) == 0 &&
phone_syms_.count(subsequential_symbol) == 0' failed.
utils/mkgraph.sh: line 76:  6263 Aborted                 fstcomposecontext
--context-size=$N --central-position=$P
--read-disambig-syms=$lang/phones/disambig.
int --write-disambig-syms=$lang/tmp/disambig_ilabels_${N}_${P}.int
$lang/tmp/ilabels_${N}_${P} < $lang/tmp/LG.fst > $clg
fstisstochastic data/lang_test_phn-mono/tmp/CLG_1_0.fst
ERROR: FstHeader::Read: Bad FST header:
data/lang_test_phn-mono/tmp/CLG_1_0.fst
ERROR (fstisstochastic:ReadFstKaldi():fstext/fstext-utils-inl.h:1183)
Reading FST: error reading FST header from
data/lang_test_phn-mono/tmp/CLG_1_0.fst
ERROR (fstisstochastic:ReadFstKaldi():fstext/fstext-utils-inl.h:1183)
Reading FST: error reading FST header from
data/lang_test_phn-mono/tmp/CLG_1_0.fst