Hi,--In data blobs and parameters blobs, both hold a data variable and diff variable. I am kind of confused by the meaning of diff. I found the the size of diff in data blobs and parameters blobs are all same with the data saved in each layer.For example, in the input data layer, the data variable size is N*3*128*128. Then the diff is the same.Could someone explains the meaning of the diff variables in each layer (especially in data blobs)? How does they contribute the backpropagation?Thanks!
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