Install/Update fails on RTX 5090 (Blackwell) - xformers flash-attn probe in runtime verification
Hey - hitting a hard install failure on an RTX 5090 (Blackwell / sm_120, Windows, CUDA 12.8, torch 2.7.1). Install and Update both abort at the WanGP runtime verification step with a CUDA crash: CUDA error (.../xformers/.../flash-attention/hopper/flash_fwd_launch_template.h:188): invalid argument Traced it to scripts/runtime_verify.py - the verify() step runs xformers.ops.memory_efficient_attention(...) because xformers.ops is in the wangp recipe's verificationImports. The pinned xformers==0.0.31.post1 dispatches that call to the flash-attention Hopper kernels, which are invalid on Blackwell,
