Keras is a high-level front-end specification and implementation for building neural network models. Keras ships with support for three back-end deep learning frameworks: TensorFlow, CNTK, and Theano.

Developed by Meta, PyTorch is a popular machine learning library that helps develop and train neural networks.

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The evolution of PyTorch Early on, academics and researchers were drawn to PyTorch because it was easier to use than TensorFlow for model development with graphics processing units (GPUs).

Facebook has already used a prototype of the Android Neural Network API that supports PyTorch to enable immersive 360-degree backgrounds on Messenger video calls.