Function export_onnx_model

detectron2/export/caffe2_export.py:33–71

Trace and export a model to onnx format. Args: model (nn.Module): inputs (tuple[args]): the model will be called by `model(*inputs)` Returns: an onnx model

(model, inputs)

def export_onnx_model(model, inputs):
    """
    Trace and export a model to onnx format.

    Args:
        model (nn.Module):
        inputs (tuple[args]): the model will be called by `model(*inputs)`

    Returns:
        an onnx model
    """
    assert isinstance(model, torch.nn.Module)

    # make sure all modules are in eval mode, onnx may change the training state
    # of the module if the states are not consistent
    def _check_eval(module):
        assert not module.training

    model.apply(_check_eval)

    # Export the model to ONNX
    with torch.no_grad():
        with io.BytesIO() as f:
            torch.onnx.export(
                model,
                inputs,
                f,
                operator_export_type=OperatorExportTypes.ONNX_ATEN_FALLBACK,
                # verbose=True,  # NOTE: uncomment this for debugging
                # export_params=True,
            )
            onnx_model = onnx.load_from_string(f.getvalue())

    # Apply ONNX's Optimization
    all_passes = onnx.optimizer.get_available_passes()
    passes = ["fuse_bn_into_conv"]
    assert all(p in all_passes for p in passes)
    onnx_model = onnx.optimizer.optimize(onnx_model, passes)
    return onnx_model


def _op_stats(net_def):