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What are ONNX, TensorRT, and model compilation, and why export/compile a model for serving?

A PyTorch model in eager mode is not the fastest form for inference. The signal is knowing that ONNX buys portability and TensorRT-style compilers buy hardware-tuned speed, and exactly which optimizations get you there. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

A PyTorch model in eager mode is not the fastest form for inference. The signal is knowing that ONNX buys portability and TensorRT-style compilers buy hardware-tuned speed, and exactly which optimizations get you there. Here is the answer.

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