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Chainer is a deep learning framework written in Python with NumPy and CuPy. It is designed to be intuitive, flexible and easy to use, allowing developers to quickly prototype and train machine learning models. Chainer is similar to PyTorch in that both frameworks are based on define-by-run, where the model is defined at the forward pass of the network. However, Chainer provides far more options for users to customize their network architectures. Additionally, Chainer allows users to use NumPy and SciPy within their models.