True, and that would allow both for user-defined mappings, and for specifying 
standard layouts.  I have a bit of concern with using the `scope` parameter to 
also describe layouts, since in my mind "scope" refers to where the entire 
buffer is located, while "layout" refers to how individual elements are 
arranged within the buffer.  Two buffers that have the same layout and 
different scopes could be `memcpy`-ed between the two scopes without additional 
rearrangement, and that would be obscured if the `scope` parameter is used to 
define both the scope and the layout.

I really like that idea of building the TIR representation based on the 
provided function.  Like with `te.compute`, that gives a convenient way to 
allow the library to handle the var/primexpr building, so long as the user 
provides the function to compute the physical indices.

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