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arXiv · 2507.16099

TorchAO: PyTorch-Native Training-to-Serving Model Optimization

Andrew Or·Apurva Jain·Daniel Vega-Myhre·Jesse Cai·Charles David Hernandez·Zhenrui Zheng·Driss Guessous·Vasiliy Kuznetsov·Christian Puhrsch·Mark Saroufim·Supriya Rao·Thien Tran·Aleksandar Samardžić
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Abstract

We present TorchAO, a PyTorch-native model optimization framework leveraging quantization and sparsity to provide an end-to-end, training-to-serving workflow for AI models. TorchAO supports a variety of popular model optimization techniques, including FP8 quantized training, quantization-aware training (QAT), post-training quantization (PTQ), and 2:4 sparsity, and leverages a novel tensor subclass abstraction to represent a variety of widely-used, backend agnostic low precision data types, including INT4, INT8, FP8, MXFP4, MXFP6, and MXFP8. TorchAO integrates closely with the broader ecosystem at each step of the model optimization pipeline, from pre-training (TorchTitan) to fine-tuning (TorchTune, Axolotl) to serving (HuggingFace, vLLM, SGLang, ExecuTorch), connecting an otherwise fragmented space in a single, unified workflow. TorchAO has enabled recent launches of the quantized Llama 3.2 1B/3B and LlamaGuard3-8B models and is open-source at https://github.com/pytorch/ao/.

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Andrew Or, Apurva Jain, Daniel Vega-Myhre, Jesse Cai, Charles David Hernandez, Zhenrui Zheng, Driss Guessous, Vasiliy Kuznetsov, Christian Puhrsch, Mark Saroufim, Supriya Rao, Thien Tran, Aleksandar Samardžić. 2025-07-21. TorchAO: PyTorch-Native Training-to-Serving Model Optimization. https://arxiv.org/abs/2507.16099

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