A bunch of improvements for the classification skill

[chemeris]

Thank you for an excellent library. I ran it against our dataset of 10k social media posts to detect their sentiment and classify it into a set of topics. This set of patches is what it took for me to get it working - from minor fixes to improvements in the learning process.

I have a bunch of ideas on how to improve learning performance with more advanced learning strategies - I'd be happy to discuss this if there is interest in implementing advanced learning strategies.

PS Let me know if you want me to break this into smaller PRs.

[niklub]

Hi, @chemeris ! thanks for your great contribution!

I'd be happy to discuss this if there is interest in implementing advanced learning strategies.

Absolutely, it would be very helpful to have different learning strategies and reasoning path, and give user the options. Feel free to open the github issue where we can discuss the solutions and reference it in PR hereafter