Which programming language was used to write the initial version of the PyTorch

The initial version of the PyTorch library grew out of Torch, an open-source machine learning library whose core was written in C and C++^[1][2]. Around 2011, Torch was rewritten as Torch7, which used the Lua scripting language for its frontend with a C and C++ backend^[3]. In mid-2016, developers at Facebook AI Research refactored it to create a Python-first framework, resulting in PyTorch^[4].

As a quick historical tidbit, Torch was originally created in 2002 by the Idiap Research Institute^[5][6] before its eventual transition into the Python-based PyTorch ecosystem in 2016^[7].Would you also like to know how PyTorch's dynamic computation graphs work?AskAnswer complete. One follow-up option available.