Theano-PyMC

Theano-PyMC is a Python library that serves as an optimizing compiler for evaluating mathematical expressions on CPUs and GPUs, featuring efficient symbolic differentiation. It is a fork of the original Theano library, specifically maintained by the PyMC developers to support PyMC3. Its current version is 1.1.2, released in January 2021. While PyMC has since transitioned to other backends (Aesara, then PyTensor), Theano-PyMC remains the foundational backend for PyMC3, meaning its release cadence is tied to critical compatibility and bug fixes for that specific PyMC version.