i gambled all my rep so I can't comment on this post:
https://crypto.stackexchange.com/questions/16195/space-complexity-of-quantum-collision-search?rq=1
But here's some related research that might work as a pre-computation...not sure how a convolutional neural net would work against "learning with errors" though...
https://www.researchgate.net/publication/325346622_Applications_of_Neural_Networks_in_Cryptanalysis