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The field is young and unlike mature fields such as physics or mathematics it doesn't take a lifetime of study to master, yet. Neural nets are actually pretty simple at their core; seemingly too simple to work as well as they do. It's entirely possible to learn this stuff to near state-of-the-art level with a year or two of self-directed study outside of work. All the research is published open access, the software i…
Do you recommend any beginner courses?
stanford offers free machine learning courses.
reddit.com/r/learnmachinelearning is also helpful for beginners.