How to debug underlying C++ library from Python interface?

Question

I am using apollocaffe and Reinspect. Apollocaffe is in c++ library and Reinspect is in python. Reinspect called apis from apollocaffe. I like to debug those apis inside apollocaffe. From python code, I used

python -m pdb train.py

But I can't go inside api from apollocaffe. I do like cout << "test" << endl; in apollocaffe. But nothing is printed to console. How can I debug c++ code, at least if I can print, it will be great.

rkellerm · Accepted Answer · 2017-09-12T07:08:54.073

15

If you are interested to debug just the C++ part, you can just start GDB with Python -

gdb python
b <C++ function to break at>
run train.py

Of course you need to compile Caffe with debug information: pass -DDEBUG=1 to cmake options of uncomment the DEBUG = 1 line in your Makefile.config.
Debugging both Python and C++ from gdb might be more complicated, see this for example.

edited Sep 12 '17 at 07:08

answered Sep 12 '17 at 07:02

rkellerm

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Have you tried the standard cout / printf? These should work. – rkellerm Sep 12 '17 at 07:04
does the C++ library that you are using contain the debug flag? – Sheikh Faisal Miskhat Sep 12 '17 at 07:04
@SheikhFaisalMiskhat You're right, thanks. Edited the answer accordingly. – rkellerm Sep 12 '17 at 07:06
@SheikhFaisalMiskhat yes in the makefile.config, DEBUG := 1 is uncommented. – batuman Sep 12 '17 at 07:07
@rursw1 yes I used cout. but doesn't print to console – batuman Sep 12 '17 at 07:08
@batuman: Maybe the cout is inserted to an incorrect place? Maybe there are several versions of the library and you're linking to the wrong one? – rkellerm Sep 12 '17 at 07:17
@rursw1 yes I am checking now. – batuman Sep 12 '17 at 07:20

How to debug underlying C++ library from Python interface?

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