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Build PyTorch from Source

You don't truly know a tool until you've compiled it yourself.

Key Insight​

PyTorch is a thin Python layer wrapped around a large C++ codebase — ATen, c10, and the CUDA kernels. Building it from source compiles all of that C++ into the libraries that import torch loads.

Why This Matters​

A source build is the gateway to changing PyTorch itself. Doing it once — even though it is slow — turns the framework from a black box into code you can edit, patch, and explore.