AC3 algorithm has non-optimal worst case time-complexity O(cd^3 ), while AC4 algorithm runs in O(cd^2) worst case time

…he constant propagation algorithm in mac inference

…eady present in test_csp.py

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… are already present in test_csp.py"

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…oosing the constant propagation algorithm in mac inference"

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….inf and numpy.isclose

…ition