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For dependency graph, use a graph data structure

Currently the dependency graph is saved as pointers to other contours.

Would be better to save as a graph (using networkx) as the current method means the contour tracker object cannot be saved by pickling. This is a problem because constructing the tracker object can take a while.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information

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For dependency graph, use a graph data structure