SOM grid size suggested by Vesanto

by jacky   Last Updated May 29, 2017 09:19 AM

I am a bit confused on the size of the SOM grid size suggested by Vesanto. Here in this link, it says 5*sqrt(N) where N is mentioned as the dataset size. What is meant by dataset size? the number of observations (rows)? number of dimensions (columns)? or product of the two? And here also there is a mention of it, but the instructions are not clear. could somebody clarify what is meant by N?

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