CHANGES:

• Fix some bugs and improve performance.
• Introduce computation graph into the functor stack.
• Optimise repeat and tile function in the core.
• Adjust the OpenCL library according to computation graph.
• Improve the API of Dataframe module.
• Add more implementation of convolution operations.
• Add dilated convolution functions.
• Add transposed convolution functions.
• Add more neurons into the Neural module.
• Add more unit tests for core functions.
• Move from jbuilder to dune
• Assuage many warnings