FST was not functional

[Ana Montalvo]

Hi all,

I am having this problem while runing utils/mkgraph.sh , exactly here:
 
...
62    if [[ ! -s $lang/tmp/LG.fst || $lang/tmp/LG.fst -ot $lang/G.fst || \
63        $lang/tmp/LG.fst -ot $lang/L_disambig.fst ]]; then
64        fsttablecompose $lang/L_disambig.fst $lang/G.fst | fstdeterminizestar --use-log=true | \
65        fstminimizeencoded | fstarcsort --sort_type=ilabel > $lang/tmp/LG.fst || exit 1;
66        fstisstochastic $lang/tmp/LG.fst || echo "[info]: LG not stochastic."
67   fi
...

in terminal:

===== MONO DECODING =====

fsttablecompose /home/ana/Desktop/kaldi/kaldi-trunk/egs/wsjcam0/data/lang/L_disambig.fst /home/ana/Desktop/kaldi/kaldi-trunk/egs/wsjcam0/data/lang/G.fst
fstminimizeencoded
fstdeterminizestar --use-log=true
DeterminizerStar: FST was not functional -> not determinizable
Non-functional FST: cannot determinize.
ERROR: FstHeader::Read: Bad FST header: -
ERROR (fstminimizeencoded:ReadFstKaldi():fstext/fstext-utils-inl.h:1273) Reading FST: error reading FST header from standard input
ERROR (fstminimizeencoded:ReadFstKaldi():fstext/fstext-utils-inl.h:1273) Reading FST: error reading FST header from standard input

[stack trace: ]
kaldi::KaldiGetStackTrace()
kaldi::KaldiErrorMessage::~KaldiErrorMessage()
fst::ReadFstKaldi(std::string)
fstminimizeencoded(main+0x1b8) [0x46d305]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fd9d326ef45]
fstminimizeencoded() [0x46d089]

ERROR: FstHeader::Read: Bad FST header: standard input


which could be the reason? What should I check?
thx guys!!
ana

[Daniel Povey]

Normally that would happen if you had not put in disambiguation
symbols (#1, #2 etc.) into the lexicon, or had not done so correctly.
It might also happen if there were empty pronunciations in the
lexicon, but I think the scripts check for that.

I have an issue up here https://github.com/kaldi-asr/kaldi/issues/1074
to remind us to add the feature to check that there are no cycles with
no phones on, in L.fst or L_disambig.fst... this would be caused by
having empty pronunciations in the lexicon; however, if you used the
standard prepare_lang.sh, this should not happen anyway.


Dan

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[Ana Montalvo]

Thankyou so much, but I am still stucked...

The initial lexicon.txt doesn't have any disambg symbol, but I do use
standard prepare_lang.sh and it creates L_disambig.fst which is used
by mkgraph.sh

So... what am I doing wrong?

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[Daniel Povey]

Firstly, make sure your code and scripts are up to date ("git pull").
If it still doesn't work, send me separately an archive containing
your lexicon.