I have a 2-dimensional array that represents a grid. The (numpy) array is as follows:

dx_grid =[[ "A", "B", "C"],
          [ "L", "M", "N"],
          [ "X", "Y", "Z"]]

I want to convert that into the following:

I know that grid_2d_graph can connect 4 adjacent nodes. For example, it would connect node M to B, L, N and Y BUT NOT to A, C, X, Z. How would I create such a graph using networkx in python?