"We have significant usage today, and it's accelerating," says Jeff Dean, who led TensorFlow's design and heads Google's core artificial- intelligence research group. Inside Google, TensorFlow powers products such as the Google Translate mobile app, which can translate a foreign menu in front of your eyes when you point your phone at it. He originally built his startup Matroid, which helps companies create image recognition software, around a competing tool called Caffe, but he dumped it after trying TensorFlow. Since Google released TensorFlow, its competitors in cloud computing, Microsoft and Amazon, have released or started supporting their own free software tools to help coders build machine-learning systems.

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