pytorch

e4ff14ad - [CUDA graphs] Error if attempting to capture uncapturable nccl (#64440)

[CUDA graphs] Error if attempting to capture uncapturable nccl (#64440) Summary: NCCL < 2.9.6 is not capturable. Attempting to capture it can cause nasty behavior (for example, ive seen capture succeed, but replay silently hang). Pytorch should preempt this with a friendlier error. cc pietern mrshenli pritamdamania87 zhaojuanmao satgera rohan-varma gqchen aazzolini osalpekar jiayisuse agolynski SciPioneer H-Huang mrzzd cbalioglu gcramer23 Pull Request resolved: https://github.com/pytorch/pytorch/pull/64440 Reviewed By: mruberry Differential Revision: D30733884 Pulled By: ngimel fbshipit-source-id: 5f2df3cf5cc0e5e68f49bf22a80d9f58064dc7ec