API

PyTorch exposes APIs at several levels. Most users only ever touch the Python one; extension authors and embedders need the others.

Page	What it is
Python API	The torch.* package surface
C++ API (libtorch)	The C++ frontend you link against from non-Python code
C-API stable	The ABI-stable subset for cross-version extensions

For runtime debug controls and environment variables, see Reference / Configuration.