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# ONNX PTQ overview
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Following is the end-to-end example using ORT quantization tool to quantize ONNX model, specifially image classification model, and run/evaluate the quantized model with TRT EP.
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## Note
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Implicit quantization is deprecated in TRT 10.1 (using calibration table in TRT EP to set `setDynamicRange`), we suggest to use explicit quantization aka QDQ format.
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## Environment setup
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### dataset
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First, prepare the dataset for calibration. TensorRT recommends calibration data size to be at least 500 for CNN and ViT models.
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