In my experience (CV) you typically want 4 dims - (height, width, channels, batch). In Julia you can do element-wise operations on two arrays if their lengths (

In my experience (CV) you typically want 4 dims - (height, width, channels, batch). In Julia you can do element-wise operations on two arrays if their lengths (i.e. size after flattening) are the same. Obviously dimension-wise that sort of thing won't work (what's the dot product of a 3-vector by a 6-vector? Undefined!) But really, the whitepaper should include this sort of detail, and you should be following the white paper.