Yeah, that was my very first one. I have since started with vectorized implementations instead of that clumsy way I did it the first time. However I found vectorization a bit tricky at first.

I'm actually planning to try and learn convolutional nets soon, and will try to setup a small study group online (basically just a repo with materials and a Slack/Gitter chat room), where people can help each other with learning it. Do you think that would help you to learn it?