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Thank you for contacting us.
About your first question, well it is normal and yes I think you should keep training it to reduce the error.
Regarding your doubts with KKN or RBF and classifying, I recommend you to check this link: https://www.general-vision.com/documentation/TM_NeuroMem_API.pdf, you should found a lot of helpful information there.
Have a nice weekend.