Add aot example with Neutron Backend

examples/nxp/README.md

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+# PyTorch Model Delegation to Neutron Backend
+
+In this guideline we will show how to use the ExecuTorch AoT part to convert a PyTorch model to ExecuTorch format and delegate the model computation to eIQ Neutron NPU using the eIQ Neutron Backend.
+
+First we will start with an example script converting the model. This example show the CifarNet model preparation. It is the same model which is part of the `example_cifarnet`
+
+The steps are expected to be executed from the executorch root folder.
+1. Run the setup.sh script to install the neutron-converter:
+```commandline
+$ examples/nxp/setup.sh
+```
+
+2. Now run the `aot_neutron_compile.py` example with the `cifar10` model 
+```commandline
+$ python -m examples.nxp.aot_neutron_compile --quantize \
+    --delegate --neutron_converter_flavor SDK_25_03 -m cifar10 
+```
+
+3. It will generate you `cifar10_nxp_delegate.pte` file which can be used with the MXUXpresso SDK `cifarnet_example` project.

examples/nxp/aot_neutron_compile.py

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+# Copyright 2024-2025 NXP
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+# Example script to compile the model for the NXP Neutron NPU
+
+import argparse
+import io
+import logging
+from collections import defaultdict
+from typing import Iterator
+
+import executorch.extension.pybindings.portable_lib
+import executorch.kernels.quantized  # noqa F401
+
+import torch
+
+from executorch.backends.nxp.neutron_partitioner import NeutronPartitioner
+from executorch.backends.nxp.nxp_backend import generate_neutron_compile_spec
+from executorch.backends.nxp.quantizer.neutron_quantizer import NeutronQuantizer
+from executorch.examples.models import MODEL_NAME_TO_MODEL
+from executorch.examples.models.model_factory import EagerModelFactory
+
+from executorch.exir import (
+    EdgeCompileConfig,
+    ExecutorchBackendConfig,
+    to_edge_transform_and_lower,
+)
+from executorch.extension.export_util import save_pte_program
+
+from torch.export import export
+from torchao.quantization.pt2e.quantize_pt2e import convert_pt2e, prepare_pt2e
+
+from .experimental.cifar_net.cifar_net import CifarNet, test_cifarnet_model
+
+FORMAT = "[%(levelname)s %(asctime)s %(filename)s:%(lineno)s] %(message)s"
+logging.basicConfig(level=logging.INFO, format=FORMAT)
+
+
+def print_ops_in_edge_program(edge_program):
+    """Find all ops used in the `edge_program` and print them out along with their occurrence counts."""
+
+    ops_and_counts = defaultdict(
+        lambda: 0
+    )  # Mapping ops to the numer of times they are used.
+    for node in edge_program.graph.nodes:
+        if "call" not in node.op:
+            continue  # `placeholder` or `output`. (not an operator)
+
+        if hasattr(node.target, "_schema"):
+            # Regular op.
+            # noinspection PyProtectedMember
+            op = node.target._schema.schema.name
+        else:
+            # Builtin function.
+            op = str(node.target)
+
+        ops_and_counts[op] += 1
+
+    # Sort the ops based on how many times they are used in the model.
+    ops_and_counts = sorted(ops_and_counts.items(), key=lambda x: x[1], reverse=True)
+
+    # Print the ops and use counts.
+    for op, count in ops_and_counts:
+        print(f"{op: <50} {count}x")
+
+
+def get_model_and_inputs_from_name(model_name: str):
+    """Given the name of an example pytorch model, return it, example inputs and calibration inputs (can be None)
+
+    Raises RuntimeError if there is no example model corresponding to the given name.
+    """
+
+    calibration_inputs = None
+    # Case 1: Model is defined in this file
+    if model_name in models.keys():
+        m = models[model_name]()
+        model = m.get_eager_model()
+        example_inputs = m.get_example_inputs()
+        calibration_inputs = m.get_calibration_inputs(64)
+    # Case 2: Model is defined in executorch/examples/models/
+    elif model_name in MODEL_NAME_TO_MODEL.keys():
+        logging.warning(
+            "Using a model from examples/models not all of these are currently supported"
+        )
+        model, example_inputs, _ = EagerModelFactory.create_model(
+            *MODEL_NAME_TO_MODEL[model_name]
+        )
+    else:
+        raise RuntimeError(
+            f"Model '{model_name}' is not a valid name. Use --help for a list of available models."
+        )
+
+    return model, example_inputs, calibration_inputs
+
+
+models = {
+    "cifar10": CifarNet,
+}
+
+
+def post_training_quantize(
+    model, calibration_inputs: tuple[torch.Tensor] | Iterator[tuple[torch.Tensor]]
+):
+    """Quantize the provided model.
+
+    :param model: Aten model to quantize.
+    :param calibration_inputs: Either a tuple of calibration input tensors where each element corresponds to a model
+                                input. Or an iterator over such tuples.
+    """
+    # Based on executorch.examples.arm.aot_amr_compiler.quantize
+    logging.info("Quantizing model")
+    logging.debug(f"---> Original model: {model}")
+    quantizer = NeutronQuantizer()
+
+    m = prepare_pt2e(model, quantizer)
+    # Calibration:
+    logging.debug("Calibrating model")
+
+    def _get_batch_size(data):
+        return data[0].shape[0]
+
+    if not isinstance(
+        calibration_inputs, tuple
+    ):  # Assumption that calibration_inputs is finite.
+        for i, data in enumerate(calibration_inputs):
+            if i % (1000 // _get_batch_size(data)) == 0:
+                logging.debug(f"{i * _get_batch_size(data)} calibration inputs done")
+            m(*data)
+    else:
+        m(*calibration_inputs)
+    m = convert_pt2e(m)
+    logging.debug(f"---> Quantized model: {m}")
+    return m
+
+
+if __name__ == "__main__":  # noqa C901
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "-m",
+        "--model_name",
+        required=True,
+        help=f"Provide model name. Valid ones: {set(models.keys())}",
+    )
+    parser.add_argument(
+        "-d",
+        "--delegate",
+        action="store_true",
+        required=False,
+        default=False,
+        help="Flag for producing eIQ NeutronBackend delegated model",
+    )
+    parser.add_argument(
+        "--target",
+        required=False,
+        default="imxrt700",
+        help="Platform for running the delegated model",
+    )
+    parser.add_argument(
+        "-c",
+        "--neutron_converter_flavor",
+        required=False,
+        default="SDK_25_03",
+        help="Flavor of installed neutron-converter module. Neutron-converter module named "
+        "'neutron_converter_SDK_24_12' has flavor 'SDK_24_12'.",
+    )
+    parser.add_argument(
+        "-q",
+        "--quantize",
+        action="store_true",
+        required=False,
+        default=False,
+        help="Produce a quantized model",
+    )
+    parser.add_argument(
+        "-s",
+        "--so_library",
+        required=False,
+        default=None,
+        help="Path to custome kernel library",
+    )
+    parser.add_argument(
+        "--debug", action="store_true", help="Set the logging level to debug."
+    )
+    parser.add_argument(
+        "-t",
+        "--test",
+        action="store_true",
+        required=False,
+        default=False,
+        help="Test the selected model and print the accuracy between 0 and 1.",
+    )
+    parser.add_argument(
+        "--operators_not_to_delegate",
+        required=False,
+        default=[],
+        type=str,
+        nargs="*",
+        help="List of operators not to delegate. E.g., --operators_not_to_delegate aten::convolution aten::mm",
+    )
+
+    args = parser.parse_args()
+
+    if args.debug:
+        logging.basicConfig(level=logging.DEBUG, format=FORMAT, force=True)
+
+    # 1. pick model from one of the supported lists
+    model, example_inputs, calibration_inputs = get_model_and_inputs_from_name(
+        args.model_name
+    )
+    model = model.eval()
+
+    # 2. Export the model to ATEN
+    exported_program = torch.export.export_for_training(
+        model, example_inputs, strict=True
+    )
+
+    module = exported_program.module()
+
+    # 4. Quantize if required
+    if args.quantize:
+        if calibration_inputs is None:
+            logging.warning(
+                "No calibration inputs available, using the example inputs instead"
+            )
+            calibration_inputs = example_inputs
+        module = post_training_quantize(module, calibration_inputs)
+
+    if args.so_library is not None:
+        logging.debug(f"Loading libraries: {args.so_library} and {args.portable_lib}")
+        torch.ops.load_library(args.so_library)
+
+    if args.test:
+        match args.model_name:
+            case "cifar10":
+                accuracy = test_cifarnet_model(module)
+
+            case _:
+                raise NotImplementedError(
+                    f"Testing of model `{args.model_name}` is not yet supported."
+                )
+
+        quantized_str = "quantized " if args.quantize else ""
+        print(f"\nAccuracy of the {quantized_str}`{args.model_name}`: {accuracy}\n")
+
+    # 5. Export to edge program
+    partitioner_list = []
+    if args.delegate is True:
+        partitioner_list = [
+            NeutronPartitioner(
+                generate_neutron_compile_spec(
+                    args.target,
+                    args.neutron_converter_flavor,
+                    operators_not_to_delegate=args.operators_not_to_delegate,
+                )
+            )
+        ]
+
+    edge_program = to_edge_transform_and_lower(
+        export(module, example_inputs, strict=True),
+        partitioner=partitioner_list,
+        compile_config=EdgeCompileConfig(
+            _check_ir_validity=False,
+        ),
+    )
+    logging.debug(f"Exported graph:\n{edge_program.exported_program().graph}")
+
+    # 6. Export to ExecuTorch program
+    try:
+        exec_prog = edge_program.to_executorch(
+            config=ExecutorchBackendConfig(extract_delegate_segments=False)
+        )
+    except RuntimeError as e:
+        if "Missing out variants" in str(e.args[0]):
+            raise RuntimeError(
+                e.args[0]
+                + ".\nThis likely due to an external so library not being loaded. Supply a path to it with the "
+                "--portable_lib flag."
+            ).with_traceback(e.__traceback__) from None
+        else:
+            raise e
+
+    def executorch_program_to_str(ep, verbose=False):
+        f = io.StringIO()
+        ep.dump_executorch_program(out=f, verbose=verbose)
+        return f.getvalue()
+
+    logging.debug(f"Executorch program:\n{executorch_program_to_str(exec_prog)}")
+
+    # 7. Serialize to *.pte
+    model_name = f"{args.model_name}" + (
+        "_nxp_delegate" if args.delegate is True else ""
+    )
+    save_pte_program(exec_prog, model_name)