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# Copyright 2021-2024, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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# **Preprocessing Using Python Backend Example**
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This example shows how to preprocess your inputs using Python backend before it is passed to the TensorRT model for inference. This ensemble model includes an image preprocessing model (preprocess) and a TensorRT model (resnet50_trt) to do inference.
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**1. Converting PyTorch Model to ONNX format:**
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Run onnx_exporter.py to convert ResNet50 PyTorch model to ONNX format. Width and height dims are fixed at 224 but dynamic axes arguments for dynamic batching are used. Commands from the 2. and 3. subsections shall be executed within this Docker container.
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$ docker run -it --gpus=all -v $(pwd):/workspace nvcr.io/nvidia/pytorch:xx.yy-py3 bash
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$ pip install numpy pillow torchvision
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$ python onnx_exporter.py --save model.onnx
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docker run -it --gpus=all -v $(pwd):/workspace nvcr.io/nvidia/pytorch:xx.yy-py3 bash
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