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CodeElements/Gridding/README.md

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 The choice of **n_rows** and **n_cols** is made **once** for each design.  Once the dimensions **(n_rows, n_cols)** have been chosen, their values define a gridded canvas, or _grid_, and remain fixed throughout Circuit Training for the given design.
 
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 The gridding process starts with the dimensions **H_canvas** and **W_canvas** of the layout canvas, as well as a list of hard **macro blocks**, where each block has a width and a height. Blocks are not rotatable. The area of a block is the product of its width and height. 
 
 Then, the gridding searches over combinations **(n_rows, n_cols)**, with constraints