Same approach as router gate. enable_bf16_fallback() pre-materializes BF16 weight matrices from NVFP4 weights, then _run_impl uses F.linear instead of NVFP4 GEMM.
Same approach as router gate. enable_bf16_fallback() pre-materializes BF16 weight matrices from NVFP4 weights, then _run_impl uses F.linear instead of NVFP4 GEMM.