How to use Chainer for Theano users

As we mentioned on our blog, Theano will stop development in a few weeks. Many aspects of Chainer were inspired by Theano's clean interface design, so we would like to introduce Chainer to users of Theano. We hope this article assists interested Theano users to move to Chainer easily. First, let's summarize the key similarities and differences between Theano and Chainer. In this post, we assume that the modules below have been imported.