From 8c7f03c77226f95f35d38d43c4a3ca36eab574ae Mon Sep 17 00:00:00 2001 From: Claude Date: Fri, 24 Jul 2026 11:18:13 +0000 Subject: [PATCH] Add onnxsim as an alternative ONNX simplification backend Keep onnxslim as the default simplifier and offer onnxsim as an equivalent, user-selectable option for modelopt.onnx.quantization.quantize(..., simplify=True) and the --simplify CLI flag. - quantize.py / __main__.py: add a simplify_backend argument (--simplify_backend) that selects between "onnxslim" (default, unchanged behavior) and "onnxsim". An unknown backend name or a missing onnxsim install fails loudly; genuine simplification failures still fall back gracefully to the original model. - pyproject.toml / uv.lock: add onnxsim>=0.7.0 to the onnx extra alongside onnxslim. onnxsim 0.7.0 ships wheels for Python 3.12+ and aarch64. - test_quantize_api.py: update the _preprocess_onnx mock signature for the new argument. - CHANGELOG.rst: document the new backend option under 0.47. Co-Authored-By: Claude Opus 4.8 Claude-Session: https://claude.ai/code/session_01PYET7LC6SwmWpkCSN18T1Z Signed-off-by: Claude --- CHANGELOG.rst | 4 +++ modelopt/onnx/quantization/__main__.py | 11 ++++++ modelopt/onnx/quantization/quantize.py | 34 +++++++++++++++++-- pyproject.toml | 1 + .../onnx/quantization/test_quantize_api.py | 1 + uv.lock | 29 ++++++++++++++++ 6 files changed, 77 insertions(+), 3 deletions(-) diff --git a/CHANGELOG.rst b/CHANGELOG.rst index 329e5d21f05..232f0684237 100755 --- a/CHANGELOG.rst +++ b/CHANGELOG.rst @@ -6,6 +6,10 @@ Changelog **New Features** +*Misc* + +- Add ``onnxsim`` as an alternative ONNX simplification backend for ``modelopt.onnx.quantization.quantize(..., simplify=True)`` (and the ``--simplify`` CLI flag). The new ``simplify_backend`` argument / ``--simplify_backend`` flag selects between ``"onnxslim"`` (default, unchanged) and ``"onnxsim"``; both produce an equivalent simplified model. ``onnxsim>=0.7.0`` now ships wheels for Python 3.12+ and aarch64. + **Backward Breaking Changes** **Deprecations** diff --git a/modelopt/onnx/quantization/__main__.py b/modelopt/onnx/quantization/__main__.py index edf05df30e3..a42eb82953e 100644 --- a/modelopt/onnx/quantization/__main__.py +++ b/modelopt/onnx/quantization/__main__.py @@ -327,6 +327,16 @@ def get_parser() -> argparse.ArgumentParser: action="store_true", help="If True, the given ONNX model will be simplified before quantization is performed.", ) + argparser.add_argument( + "--simplify_backend", + type=str, + default="onnxslim", + choices=["onnxslim", "onnxsim"], + help=( + "ONNX simplification package to use when --simplify is set. " + "Both produce an equivalent simplified model (default: onnxslim)." + ), + ) argparser.add_argument( "--calibrate_per_node", action="store_true", @@ -552,6 +562,7 @@ def main(): use_zero_point=args.use_zero_point, passes=args.passes, simplify=args.simplify, + simplify_backend=args.simplify_backend, calibrate_per_node=args.calibrate_per_node, direct_io_types=args.direct_io_types, opset=args.opset, diff --git a/modelopt/onnx/quantization/quantize.py b/modelopt/onnx/quantization/quantize.py index d8b2471f127..c4b79125835 100755 --- a/modelopt/onnx/quantization/quantize.py +++ b/modelopt/onnx/quantization/quantize.py @@ -122,6 +122,7 @@ def _preprocess_onnx( trt_plugins_precision: list[str] | None, override_shapes: str, simplify: bool = False, + simplify_backend: str = "onnxslim", quantize_mode: str = "int8", opset: int | None = None, ) -> tuple[str, onnx.ModelProto, list[str], bool, bool, bool, dict, dict]: @@ -218,10 +219,32 @@ def _preprocess_onnx( # Simplify model if requested if simplify: - logger.info("Attempting to simplify model") + logger.info(f"Attempting to simplify model with '{simplify_backend}'") + + # Resolve the backend before attempting simplification so that a missing + # optional dependency or an unknown backend name fails loudly instead of + # being silently swallowed by the graceful fallback below. + if simplify_backend == "onnxsim": + try: + import onnxsim + except ModuleNotFoundError as e: + logger.warning( + "onnxsim is not installed. Please install it with 'pip install onnxsim'." + ) + raise e + elif simplify_backend != "onnxslim": + raise ValueError( + f"Unsupported simplify_backend '{simplify_backend}'. " + "Choose one of: 'onnxslim', 'onnxsim'." + ) + try: - model_simp = onnxslim.slim(onnx_model, skip_fusion_patterns=["FusionGemm"]) - if model_simp: + if simplify_backend == "onnxslim": + model_simp = onnxslim.slim(onnx_model, skip_fusion_patterns=["FusionGemm"]) + check = model_simp is not None + else: + model_simp, check = onnxsim.simplify(onnx_model) + if check: onnx_model = model_simp onnx_path = os.path.join(output_dir, f"{model_name}_simp.onnx") save_onnx(onnx_model, onnx_path, use_external_data_format) @@ -395,6 +418,7 @@ def quantize( autotune_warmup_runs: int = 50, autotune_timing_runs: int = 100, autotune_trtexec_args: str | None = None, + simplify_backend: str = "onnxslim", **kwargs: Any, ) -> None: """Quantizes the provided ONNX model. @@ -558,6 +582,9 @@ def quantize( autotune_trtexec_args: Additional trtexec arguments as a single quoted string. Example: --autotune_trtexec_args '--fp16 --workspace=4096' + simplify_backend: + ONNX simplification package to use when ``simplify`` is set. One of ``"onnxslim"`` + (default) or ``"onnxsim"``; both produce an equivalent simplified model. kwargs: Additional keyword arguments for int4 quantization, including: - awqlite_alpha_step (float): Alpha step for lite, range [0, 1]. @@ -627,6 +654,7 @@ def quantize( trt_plugins_precision, override_shapes, # type: ignore[arg-type] simplify, + simplify_backend, quantize_mode, opset, ) diff --git a/pyproject.toml b/pyproject.toml index ccec4e1b82b..3abfc21fb22 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -69,6 +69,7 @@ onnx = [ "onnxruntime~=1.24.2; python_version > '3.10' and (platform_machine == 'aarch64' or platform_system == 'Darwin')", "onnxruntime-gpu~=1.24.2; python_version > '3.10' and platform_machine != 'aarch64' and platform_system != 'Darwin' and platform_system != 'Windows'", "onnxscript", + "onnxsim>=0.7.0", "onnxslim>=0.1.76", "polygraphy>=0.49.22", ] diff --git a/tests/unit/onnx/quantization/test_quantize_api.py b/tests/unit/onnx/quantization/test_quantize_api.py index f350d5d89f4..e7c595d23a8 100644 --- a/tests/unit/onnx/quantization/test_quantize_api.py +++ b/tests/unit/onnx/quantization/test_quantize_api.py @@ -89,6 +89,7 @@ def fake_preprocess( trt_plugins_precision, override_shapes, simplify, + simplify_backend, quantize_mode, opset, ): diff --git a/uv.lock b/uv.lock index ebe5c12d2fe..4f044327f3a 100644 --- a/uv.lock +++ b/uv.lock @@ -2273,6 +2273,7 @@ all = [ { name = "onnxruntime-gpu", version = "1.22.0", source = { registry = "https://pypi.org/simple" }, marker = "(python_full_version < '3.11' and platform_machine != 'aarch64' and sys_platform != 'darwin') or sys_platform == 'win32'" }, { name = "onnxruntime-gpu", version = "1.24.4", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11' and platform_machine != 'aarch64' and sys_platform != 'darwin' and sys_platform != 'win32'" }, { name = "onnxscript" }, + { name = "onnxsim" }, { name = "onnxslim" }, { name = "pandas", version = "2.3.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.11'" }, { name = "pandas", version = "3.0.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" }, @@ -2312,6 +2313,7 @@ dev = [ { name = "onnxruntime-gpu", version = "1.22.0", source = { registry = "https://pypi.org/simple" }, marker = "(python_full_version < '3.11' and platform_machine != 'aarch64' and sys_platform != 'darwin') or sys_platform == 'win32'" }, { name = "onnxruntime-gpu", version = "1.24.4", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11' and platform_machine != 'aarch64' and sys_platform != 'darwin' and sys_platform != 'win32'" }, { name = "onnxscript" }, + { name = "onnxsim" }, { name = "onnxslim" }, { name = "pandas", version = "2.3.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.11'" }, { name = "pandas", version = "3.0.3", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" }, @@ -2396,6 +2398,7 @@ onnx = [ { name = "onnxruntime-gpu", version = "1.22.0", source = { registry = "https://pypi.org/simple" }, marker = "(python_full_version < '3.11' and platform_machine != 'aarch64' and sys_platform != 'darwin') or sys_platform == 'win32'" }, { name = "onnxruntime-gpu", version = "1.24.4", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11' and platform_machine != 'aarch64' and sys_platform != 'darwin' and sys_platform != 'win32'" }, { name = "onnxscript" }, + { name = "onnxsim" }, { name = "onnxslim" }, { name = "polygraphy" }, ] @@ -2445,6 +2448,7 @@ requires-dist = [ { name = "onnxruntime-gpu", marker = "python_full_version < '3.11' and platform_machine != 'aarch64' and sys_platform != 'darwin' and sys_platform != 'win32' and extra == 'onnx'", specifier = "~=1.22.0" }, { name = "onnxruntime-gpu", marker = "sys_platform == 'win32' and extra == 'onnx'", 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