Python and lua both have good frameworks for developing such models (tensorflow, theano possibly with lasagne or keras, torch, caffe...). The visual part need

Python and lua both have good frameworks for developing such models (tensorflow, theano possibly with lasagne or keras, torch, caffe...). The visual part need access to efficient GPU-based implementation of convolutions (typically using cuDNN from nvidia or neon from Nervana Systems). You could write bindings for other languages or even work directly in C++ but I think that an interactive programming language with a REPL like Python and lua is very helpful for faster iterative model building, interactive exploration and evaluation.