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Shengliang Xu
04f58166ab
### What does this PR do?
Type of change: new feature
Replaces the hardcoded model-type branches in `examples/llm_ptq/` with
opt-in declarative **model-specific recipes** under
`modelopt_recipes/huggingface/<model_type>/ptq/`. Any adjustment
specific to a model type or instance must live in that model's recipe —
there is no implicit model-specific path anymore. Users select a model's
recipe with `--recipe huggingface/<model_type>/ptq/<recipe>`; users on
the plain `--qformat` path get only the generic numerics.
What moved out of Python
(`examples/llm_ptq/example_utils.py::build_quant_cfg` and
`examples/llm_ptq/hf_ptq.py::mono_quantize`):
- **gemma / mpt** `w4a8_awq` → `awq_lite` with `alpha_step=1` (coarser
search to avoid TRT-LLM overflow).
- **gemma** `int8_sq` → SmoothQuant `alpha=0.5` (default `1.0` regresses
Gemma 7B).
- **phi4mm** → disable `*speech*`, `*audio*`, `*image*`, `*vision*`
(quantize only the language model).
- **Nemotron VL** → disable `*vision*`, `*image*`, `*radio*`,
`*visual*`, `*encoder*`, `*model_encoder*` (quantize only the decoder).
What stayed in Python:
- MTP dynamic layer exclusion in `hf_ptq.py` (depends on
runtime-detected layer indices).
- `is_nemotron_vl(full_model)` detection itself, which still drives the
VLM calibration loop and the post-quantize `full_model` update — only
the `quant_cfg` adjustment it triggered moved into the Nemotron VL
recipe.
`multinode_ptq.py` shares the same `build_quant_cfg` call site and was
updated to match the new 2/3-arg signature; multinode users on
`--qformat` get the generic numerics (no `--recipe` plumbing in
multinode yet, so model-specific recipes are only reachable via
`hf_ptq.py`).
Already-YAML recipes that were elsewhere in the tree are relocated into
the same `huggingface/<model_type>/ptq/` layout so all model-specific
recipes live under one convention:
- **Step3.5-Flash** — moved from
`modelopt_recipes/huggingface/step3p5/Step3.5-Flash/` to
`huggingface/step3p5/Step3.5-Flash/ptq/` to match the `<model>/ptq/`
convention.
- **Qwen3.5 / Qwen3.6** — moved from
`modelopt_recipes/models/Qwen3.5-Qwen3.6/w4a16.yaml` to per-model_type
folders, anchored on the HuggingFace `model_type` (verified against
transformers 5.8.1 + HF model hub `config.json` for `Qwen/Qwen3.6-27B`,
`Qwen/Qwen3.6-35B-A3B`, `nvidia/Qwen3.5-397B-A17B-NVFP4`):
- `huggingface/qwen3_5/ptq/w4a16_nvfp4-fp8_attn-kv_fp8_cast.yaml` —
dense `qwen3_5`
- `huggingface/qwen3_5_moe/ptq/w4a16_nvfp4-fp8_attn-kv_fp8_cast.yaml` —
`qwen3_5_moe`
- Both wrappers `$import` the shared `quant_cfg` snippet
`huggingface/qwen3_5/ptq/w4a16_nvfp4-fp8_attn-kv_fp8_cast.quant_cfg.yaml`
(one source of truth; the two model_types share the same hybrid
linear-attention + softmax-attention architecture so the rules apply
identically).
Full recipe layout (`modelopt_recipes/huggingface/`):
```
gemma/ptq/{w4a8_awq,int8_sq}-kv_fp8_cast.yaml
mpt/ptq/w4a8_awq-kv_fp8_cast.yaml
phi4mm/ptq/{disabled_quantizers,nvfp4-kv_fp8_cast}.yaml
nemotron_vl/ptq/{disabled_quantizers,nvfp4-kv_fp8_cast}.yaml
qwen3_5/ptq/w4a16_nvfp4-fp8_attn-kv_fp8_cast{,.quant_cfg}.yaml
qwen3_5_moe/ptq/w4a16_nvfp4-fp8_attn-kv_fp8_cast.yaml
step3p5/Step3.5-Flash/ptq/nvfp4-mlp-only.yaml
```
All recipes ship with FP8 KV-cache cast (`kv_fp8_cast`). For phi4mm and
nemotron_vl, `disabled_quantizers.yaml` is a multi-document list unit
that `$import`s the standard `default_disabled_quantizers` exclusions
and appends the model-specific ones — so each recipe imports a single
disabled-quantizer slot instead of layering two, with no duplication in
YAML. Each `ptq/` folder has a `README.md` describing exactly what is
model-specific.
### Usage
```bash
# Gemma W4A8 AWQ with the Gemma-specific algorithm tuning + FP8 KV cache:
python examples/llm_ptq/hf_ptq.py \
--pyt_ckpt_path google/gemma-7b \
--recipe huggingface/gemma/ptq/w4a8_awq-kv_fp8_cast \
--export_path ./out
# Nemotron VL with vision branches excluded automatically:
python examples/llm_ptq/hf_ptq.py \
--pyt_ckpt_path nvidia/<nemotron-vl-model> \
--recipe huggingface/nemotron_vl/ptq/nvfp4-kv_fp8_cast \
--export_path ./out
```
### Testing
- Pre-commit recipe validator
(`tools/precommit/check_modelopt_recipes.py`) loads every new recipe via
`load_recipe()` — passes for all new YAMLs (gemma/mpt/phi4mm/nemotron_vl
recipes + phi4mm/nemotron_vl `disabled_quantizers` snippets + qwen3_5 /
qwen3_5_moe recipe wrappers + the shared
`w4a16_nvfp4-fp8_attn-kv_fp8_cast.quant_cfg` snippet + Step3.5-Flash
relocation).
- For qwen3_5 / qwen3_5_moe specifically, `load_recipe(...)` on both
wrappers produces an identical 33-entry resolved `quant_cfg`, confirming
the shared snippet is the single source of truth.
- `yamlfmt` + `markdownlint` + `bandit` + license-insertion hooks all
pass.
- No tests reference the removed `build_quant_cfg(qformat, ...,
model_type, ...)` signature; the only call sites (`hf_ptq.py`,
`multinode_ptq.py`) were updated to the new 2/3-arg form.
### Before your PR is "*Ready for review*"
- Is this change backward compatible?: ❌ — users who relied on
**automatic** model-specific quant_cfg behavior via `--qformat`
(gemma/mpt AWQ, gemma SmoothQuant, phi4mm exclusions, Nemotron VL
exclusions) now need to pass `--recipe
huggingface/<model_type>/ptq/<recipe>` to apply the model's recipe. The
flag itself is unchanged; only the implicit behavior was removed.
- If you copied code from any other sources or added a new PIP
dependency, did you follow guidance in `CONTRIBUTING.md`: N/A
- Did you write any new necessary tests?: ❌ — relies on the existing
pre-commit recipe validator that loads each new YAML.
- Did you update Changelog?: ✅
- Did you get Claude approval on this PR?: ❌
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added many model-specific PTQ recipes (Gemma, MPT, Nemotron VL,
Phi‑4‑Multimodal, Qwen3.5, Qwen3.5‑MoE) and support for AWQ block-size
and MoE calibration ratio in quantization options.
* **Documentation**
* Expanded READMEs and changelog to document recipe locations, layout,
and how to opt into model-specific PTQ recipes.
* **Refactor**
* Model-specific PTQ tweaks moved to opt‑in recipes; default behavior
uses generic numerics.
<!-- review_stack_entry_start -->
[](https://app.coderabbit.ai/change-stack/NVIDIA/Model-Optimizer/pull/1506?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)
<!-- review_stack_entry_end -->
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Signed-off-by: Shengliang Xu <shengliangx@nvidia.com>
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35 lines
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# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# QuantizerCfgList snippet of disabled quantizers for Phi-4-Multimodal.
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# Splices in the standard `default_disabled_quantizers` exclusions and appends
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# Phi-4-MM-specific ones so that only the language model is quantized;
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# speech/audio/image/vision branches are skipped. Recipes that import this
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# should NOT also import `default_disabled_quantizers`.
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# modelopt-schema: modelopt.torch.quantization.config.QuantizerCfgListConfig
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imports:
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default_disabled_quantizers: configs/ptq/units/default_disabled_quantizers
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---
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- $import: default_disabled_quantizers
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- quantizer_name: '*speech*'
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enable: false
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- quantizer_name: '*audio*'
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enable: false
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- quantizer_name: '*image*'
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enable: false
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- quantizer_name: '*vision*'
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enable: false
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