Segmentation Fault Core Dumped during LSTM training

[Shubham Gupta]

Hi All

I am training Tesseract for Perso-Arabic languages using my custom dataset. I get Segmentation fault-core dumped error and training gets stopped. Net-spec used: net_spec '[1,0,0,1 Ct5,5,16 Ct3,3,8 Mp3,3 Lfys64 Lfx128 Lbx64 Lby64 Lrx128 Lfx128 O1c105]'.Attaching the terminal error output below:

Thread 1 "lstmtraining" received signal SIGSEGV, Segmentation fault.
tesseract::Logistic (x=-nan(0x8000000000000)) at functions.h:90
90  double l0 = LogisticTable[index];
(gdb) bt
#0  tesseract::Logistic (x=-nan(0x8000000000000)) at functions.h:90
#1  tesseract::FFunc::operator() (this=<synthetic pointer>,
    x=-nan(0x8000000000000)) at functions.h:98
#2  tesseract::FuncInplace<tesseract::FFunc> (inout=<optimized out>,
    n=<optimized out>) at functions.h:163
#3  tesseract::LSTM::Forward () at lstm.cpp:364
#4  0x00007ffff625d30c in GOMP_parallel_sections ()
   from /usr/lib/x86_64-linux-gnu/libgomp.so.1
#5  0x00007ffff7a3ccd6 in tesseract::LSTM::Forward (this=0x55555f713cd0,
    debug=<optimized out>, input=..., input_transpose=<optimized out>,
    scratch=0x7fffffffbf58, output=0x555562b56c00) at lstm.cpp:322
#6  0x00007ffff7a543eb in tesseract::Parallel::Forward (this=0x555556504490,
    debug=false, input=..., input_transpose=<optimized out>,
    scratch=0x7fffffffbf58, output=0x555562b61460) at parallel.cpp:93
#7  0x00007ffff7a60d01 in tesseract::Reversed::Forward (this=0x55556030af00,
    debug=<optimized out>, input=..., input_transpose=<optimized out>,
    scratch=0x7fffffffbf58, output=0x55555f715060) at reversed.cpp:60
#8  0x00007ffff7a6293f in tesseract::Series::Forward (this=0x555560454110,
    debug=<optimized out>, input=..., input_transpose=<optimized out>,
    scratch=0x7fffffffbf58, output=0x7fffffffad80) at series.cpp:119
#9  0x00007ffff7a410ab in tesseract::LSTMRecognizer::RecognizeLine (
    this=this@entry=0x7fffffffbc18, image_data=..., invert=<optimized out>,
    debug=debug@entry=false, re_invert=<optimized out>,
---Type <return> to continue, or q <return> to quit---

Any help to solve this shall be highly appreciated.

Thanks

Shubham

[Shree Devi Kumar]

Check your netspec. Does it meet the required vgsl specs. See wiki for details and netspec used for various languages.

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[Shubham Gupta]

Hi Everyone

I am getting segmentation fault core dumped again.

 gdb error I am getting is as follows:

Thread 1 "lstmtraining" received signal SIGSEGV, Segmentation fault.

0x00007ffff7801a34 in ?? () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
(gdb) bt
#0  0x00007ffff7801a34 in ?? () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#1  0x00007ffff604d30c in GOMP_parallel_sections () from /usr/lib/x86_64-linux-gnu/libgomp.so.1
#2  0x00007ffff780786e in tesseract::LSTM::Forward(bool, tesseract::NetworkIO const&, tesseract::TransposedArray const*, tesseract::NetworkScratch*, tesseract::NetworkIO*) () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#3  0x00007ffff781e50b in tesseract::Parallel::Forward(bool, tesseract::NetworkIO const&, tesseract::TransposedArray const*, tesseract::NetworkScratch*, tesseract::NetworkIO*) () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#4  0x00007ffff7827fe1 in tesseract::Reversed::Forward(bool, tesseract::NetworkIO const&, tesseract::TransposedArray const*, tesseract::NetworkScratch*, tesseract::NetworkIO*) () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#5  0x00007ffff78299f3 in tesseract::Series::Forward(bool, tesseract::NetworkIO const&, tesseract::TransposedArray const*, tesseract::NetworkScratch*, tesseract::NetworkIO*) () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#6  0x00007ffff780bbe0 in tesseract::LSTMRecognizer::RecognizeLine(tesseract::ImageData const&, bool, bool, bool, bool, float*, tesseract::NetworkIO*, tesseract::NetworkIO*) () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#7  0x00007ffff781212c in tesseract::LSTMTrainer::PrepareForBackward(tesseract::ImageData const*, tesseract::NetworkIO*, tesseract::NetworkIO*) ()
   from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#8  0x00007ffff781284d in tesseract::LSTMTrainer::TrainOnLine(tesseract::ImageData const*, bool) () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#9  0x00007ffff7813a54 in tesseract::LSTMTrainer::ReduceLayerLearningRates(double, int, tesseract::LSTMTrainer*) ()
   from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#10 0x00007ffff7813e85 in tesseract::LSTMTrainer::ReduceLearningRates(tesseract::LSTMTrainer*, STRING*) () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#11 0x00007ffff781418e in tesseract::LSTMTrainer::StartSubtrainer(STRING*) () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#12 0x00007ffff78146fb in tesseract::LSTMTrainer::MaintainCheckpoints(TessResultCallback4<STRING, int, double const*, tesseract::TessdataManager const&, int>*, STRING*) () from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#13 0x000055555555ace7 in main ()
(gdb) Quit

Can somebody please help with this?

Thanks

Shubham

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