chainer
                                A flexible framework of neural networks for deep learning
                            
                        How to download and setup chainer
Open terminal and run command
                                            git clone https://github.com/chainer/chainer.git
                                        
                                        git clone is used to create a copy or clone of chainer repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with chainer https://github.com/chainer/chainer/archive/master.zip
Or simply clone chainer with SSH
                                            [email protected]:chainer/chainer.git                                    
                                    If you have some problems with chainer
You may open issue on chainer support forum (system) here: https://github.com/chainer/chainer/issuesSimilar to chainer repositories
Here you may see chainer alternatives and analogs
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