Microsoft Cognitive Toolkit (Formerly CNTK)

Microsoft Cognitive Toolkit (CNTK) is an open-source, unified deep learning toolkit for building, training, and evaluating neural networks. It lets users define neural networks as computational graphs, supports various types of models (DNNs, CNNs, RNNs/LSTMs), and is optimized for scalable performance on multiple GPUs and servers. CNTK is suitable for researchers, machine learning engineers, and developers looking for flexible and high-performance deep learning infrastructure. As of version 2.7, active development has ceased in favor of ONNX and ONNX Runtime.