Marvin is a deep learning framework designed first and foremost to be hackable. It is naively simple for fast prototyping, uses only basic C/C++, and only calls CUDA and cuDNN as dependencies.
was curious about this while looking through:
github.com/alicevision/geogram/blob/05b3ef4edf0b87b5e52ff7f93a520e0e98ab3951/src/lib/geogram/basic/quaternion.h#L67
Sourcetrail is a productivity tool for software developers on Windows, Mac and Linux. It uses static source code analysis to provide a visualization that lets you follow calls and other dependencies.
W. Lavrijsen, and A. Dutta. Proceedings of the 6th Workshop on Python for High-Performance and Scientific Computing, page 27--35. Piscataway, NJ, USA, IEEE Press, (2016)