Can extvocab_top/HCLG.fst decode via online2-wav-nnet3-latgen-faster？

[CC ZHOU]

Hi Dan,

I understand  extvocab_top/HCLG.fst is the top graph to be used by make-grammar-fst when creating grammar.

I thought  extvocab_top/HCLG.fst, a ConstFst, can also be decoded by normal decoders, like online2-wav-nnet3-latgen-faster. Thusly, I did experiments and found it fails, reporting segmentation fault error:

Thread 1 "online2-wav-nne" received signal SIGSEGV, Segmentation fault.

kaldi::nnet3::DecodableAmNnetLoopedOnline::LogLikelihood (this=0x7fffffffc1f8, subsampled_frame=0, index=12059025) at decodable-online-looped.cc:255

255       trans_model_.TransitionIdToPdfFast(index));

The figure below is the log when creating extvocab_top/HCLG.fst. And I noticed --nonterm-phones-offset info is added during graph creation, followed by convert program make-grammar-fst.

Accordingly, I infer the error is related to graph making with nonterm-phones-offset info.

Could you please explain it to me?

Thank you!

CC Zhou

[Daniel Povey]

Hi Dan,

I understand  extvocab_top/HCLG.fst is the top graph to be used by make-grammar-fst when creating grammar.

I thought  extvocab_top/HCLG.fst, a ConstFst, can also be decoded by normal decoders, like online2-wav-nnet3-latgen-faster.

No it can't, it's intended to be used only with the grammar-decoding framework.  It has special symbols which are out of range and will cause that segfault.  The checks were removed for speed, so it's just a segfault.

 

Thusly, I did experiments and found it fails, reporting segmentation fault error:

Thread 1 "online2-wav-nne" received signal SIGSEGV, Segmentation fault.

kaldi::nnet3::DecodableAmNnetLoopedOnline::LogLikelihood (this=0x7fffffffc1f8, subsampled_frame=0, index=12059025) at decodable-online-looped.cc:255

255       trans_model_.TransitionIdToPdfFast(index));

The figure below is the log when creating extvocab_top/HCLG.fst. And I noticed --nonterm-phones-offset info is added during graph creation, followed by convert program make-grammar-fst.

Accordingly, I infer the error is related to graph making with nonterm-phones-offset info.

Could you please explain it to me?

Thank you!

CC Zhou

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[CC ZHOU]

Thank you for your information!

在 2019年7月6日星期六 UTC+8下午12:20:47，Dan Povey写道：

Hi Dan,

I understand  extvocab_top/HCLG.fst is the top graph to be used by make-grammar-fst when creating grammar.

I thought  extvocab_top/HCLG.fst, a ConstFst, can also be decoded by normal decoders, like online2-wav-nnet3-latgen-faster.

No it can't, it's intended to be used only with the grammar-decoding framework.  It has special symbols which are out of range and will cause that segfault.  The checks were removed for speed, so it's just a segfault.

 

Thusly, I did experiments and found it fails, reporting segmentation fault error:

Thread 1 "online2-wav-nne" received signal SIGSEGV, Segmentation fault.

kaldi::nnet3::DecodableAmNnetLoopedOnline::LogLikelihood (this=0x7fffffffc1f8, subsampled_frame=0, index=12059025) at decodable-online-looped.cc:255

255       trans_model_.TransitionIdToPdfFast(index));

The figure below is the log when creating extvocab_top/HCLG.fst. And I noticed --nonterm-phones-offset info is added during graph creation, followed by convert program make-grammar-fst.

Accordingly, I infer the error is related to graph making with nonterm-phones-offset info.

Could you please explain it to me?

Thank you!

CC Zhou

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