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This PR aims to resolve segfault reported by multiple users in issue #45
To better trace the error without exchanging testing dataset, I added this simple debugging mode to print backtrace at the crash site.
Debugging Mode
If you encounter abnormal errors, e.g. "Segmentation fault", you can try to recompile the build under debugging mode:
and then rerun your command line to locate the backtrace message, and then post it to issues page, for example: