What is the meaning of groups in importCaffeNetwork()?

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I have the caffe model and tried to import it by using this:-
net = importCaffeNetwork(protofile,datafile)
And then I have an error message:-
The layer 'hg1_low6_low6_low6_up5' contains 256 groups. Maximum number of groups supported is 2
What is the meaning of group here?
  1 Comment
Walter Roberson
Walter Roberson on 2 Mar 2019
256 sounds like uint8 0 to 255. I suspect that layer is expecting two-level rather than 256 levels. Expecting black and white in other words, but not necessarily {0,1} or {0, 255}, just any two distinct values.

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