inf loss at big batch

[karpathy]

just creating a todo. large batch sizes work now having fixed the size_t bug:

./train_gpt2cu -b 36 -v 200 -s 200 -i data/TinyStories

works, but 48 should fit but doesn't work

./train_gpt2cu -b 48 -v 200 -s 200 -i data/TinyStories

val loss is -nan and train loss stays at inf.

todo track down why and how to prevent