[akiselev]

It looks like most of the frameworks for ML started before Rust's 1.0 stable so it's no surprise we're not seeing it in those arenas. Since GPUs and CUDA in particular play such a heavy role in ML I also wouldn't be surprised if some projects chose C/C++ to avoid maintaining multiple languages (CUDA uses C kernels compiled by a proprietary compiler).

From my understanding, most ML work isn't really done at the algorithm level but at the data level, as in manipulating data and experimenting with a variety of existing implementations. Since we have so much experience already available in optimizing C and there's not that much actual low level code to write, it makes sense to stick to C.