# DGR-001 quality-parity evidence summary

This summary is generated by `summarize-quality-parity.py` from signed reports.
It contains no independent logit measurements or self-asserted verification flag.

| Source | Device | Quality oracle | BF16 GGUF candidate | Exact | Similarity | Status |
|---|---|---|---|---:|---:|---|
| CPU v1 (`e4eedadf-22f6-4907-8990-985456961099`) | CPU | Transformers BF16 | llama.cpp BF16 | 0.3333 | 0.9471 | immutable `stop` |
| ROCm diagnostic (`31bf44e7-ccd4-4277-84ac-c775dee65411`) | ROCm0 / Radeon 8060S | Transformers float32 | llama.cpp BF16 | 1.0000 | 1.0000 | diagnostic only |

## Interpretation

The CPU and ROCm rows use different plans, devices, kernels, and quality oracles.
The CPU BF16 divergence remains unexplained and v1 remains `stop`. The signed
ROCm report establishes the narrower fact that the same BF16 GGUF artifact
matched the float32 oracle for all three GPU sequences with zero failures.
Its signed backend detail records `ROCm0: Radeon 8060S Graphics` and measured
`25/25` layer offload.

No conversion corruption was observed in that three-sequence ROCm sample. This
does not prove global conversion correctness and does not retroactively change
or explain the CPU result. A future v2 should predeclare a float32 quality oracle
separately from its BF16 performance reference and use a larger corpus.

## Reproduction and bindings

- CPU report SHA-256: `5d99a58806f39821c9206728047b8c5d605027d8a41b88639089b2418da890b5`
- GPU report SHA-256: `527b33d03627d57d60b30331e6b9119f579a828d6f6acb5c74ca25bab0af5f3d`
- BF16 GGUF SHA-256: `e842fdc35d7f00fda95a54e1b51731ba1d196aea45065cc9f46925fdc1d6f862`
- Signer fingerprint: `8baca8742d9b3ed0c3fc54929c23f75ec8c1c739900aaf5334780d598ffa84de`
- Exact verification command: see `commands.txt`.