Theano

A pioneering Python library that compiles symbolic mathematical expressions into optimized C++ and CUDA code for high-performance numerical computation.

Developed by the MILA lab at the University of Montreal, Theano defined the template for modern deep learning frameworks by compiling symbolic expressions into efficient machine code. It handles multi-dimensional arrays with NumPy-inspired syntax (delivering significant speedups on both CPUs and GPUs). Although the original project concluded active development in 2017, its architectural DNA lives on in forks like Aesara and PyTensor: essential components for the PyMC ecosystem and large-scale academic research.

https://github.com/Theano/Theano