tests/layertest.py:
- Loads layer 0 expert weights from both original (MXFP4) and NVFP4 checkpoints
- Dequantizes both to BF16 for reference comparison
- Runs MoE forward pass in pure BF16 (no kernel)
- Runs same forward pass through our NVFP4 CUTLASS kernel
- Compares cosine similarity: kernel vs BF16 reference
tests/run_test.sh:
- Creates venv, installs deps, builds kernel from source, runs test
Isolates our kernel completely from vLLM's weight loading, tensor
parallelism, and MoE routing. If cosine ≈ 1.0, bug is in vLLM. If
cosine ≈ 0, bug is in our kernel pipeline.
