title: Kohonen Self Organizing Maps: Determining the number of neurons and grid size
body: <p>I have a large dataset I am trying to do cluster analysis on using SOM. The dataset is <strong>HUGE</strong> (~ billions of records) and I am not sure what should be the number of neurons and the SOM grid size to start with. Any pointers to some material that talks about estimating the number of neurons and grid size would be greatly appreciated.</p>
  
  <p>Thanks!</p>