Devon, I recently noticed convolutional neural networks for image recognition and developed a very limited J version for my own purposes. I am not sure the result is ready for prime time, but it was really enlightening to see what could be done especially with J's array orientation. I got a lot from the following link.
http://cs231n.github.io/convolutional-networks/ On Mon, Dec 4, 2017 at 10:37 PM, Devon McCormick <[email protected]> wrote: > I'm learning about machine-learning in general and both courses I've taken > are basically intros to Python's sci-kit which is good for a high-level > look but gives no clue to the underlying algos. > > I searched the J wiki for "quadratic" and found a mention from a 2005 > NYCJUG meeting where we were lamenting that other environments simply have > quadratic solvers available but J does not. Looking into it more, I was > unsure "quadratic" means in "quadratic solver"; from "Numerical Recipes", I > gather that it may refer to quadratic convergence. On further reflection, > I'm not exactly sure what this means either but suspect it means something > like O(sqrt(n)) solution time but am not sure. I'm also unclear if this > non-linear solver in J - http://code.jsoftware.com/wiki/Scripts/nlls - is > an example of a quadratic solver (with this follow-up page I put together - > http://code.jsoftware.com/wiki/NYCJUG/2010-11-09/ > Levenberg-MarquardtAlgorithm > ). > > Perhaps someone more acquainted with this domain can shed some light. > > My ultimate goal for these sort of tools is to do something with the > million or so photos I have but I'm seeing from what I've learned so far > that the real work is in feature-extraction, so that at least is something > where I can use J to good effect. > > I'm less interested in a wrapper such as the one Scott Locklin mentioned > and more interested in expressing the algorithm in an understandable, > compact form but may end up surrendering to the popularity contest and > simply using the Python library. > > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
