PyTorch

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PyTorch is a machine learning framework based on the Torch library, used for applications such as computer vision and natural language processing. It is free and open-source software released under the modified BSD license. PyTorch provides two high-level features: Tensor computation (like NumPy) with strong GPU acceleration and Deep Neural Networks built on a tape-based autograd system. It is written in Python and is relatively easy for most machine learning developers to learn and use.

In PyTorch, the tape-based autograd system is a technique used to compute gradients efficiently and it happens to be used by backpropagation. Autograd is the core torch package for automatic differentiation1. A simple explanation of reverse-mode automatic differentiation can be found in this PyTorch forum post. PyTorch’s Autograd feature is part of what makes PyTorch flexible and fast for building machine learning projects.