Graph-based models with bi-directional nodes

A method, comprising:

• receiving, by processing circuitry of an overlay system, a stimulus,
• wherein an executable graph-based model is stored in a storage element of the overlay system, and
• wherein the executable graph-based model includes a plurality of bi-directional nodes and a plurality of connection links,
• identifying, by the processing circuitry, based on the stimulus, a first bi-directional node from the plurality of bi-directional nodes;
• determining, by the processing circuitry, a first connection link, of the plurality of connection links, coupled to the first bi-directional node, the first connection link including a first outward connection object defining association with the first bi-directional node and a first inward connection object defining association with a second bi-directional node of the plurality of bi-directional nodes;
• identifying, by the processing circuitry, based on the first connection link, the second bi-directional node;
• and
• executing, by the processing circuitry, an operation associated with the stimulus based on at least one of the first bi-directional node, the second bi-directional node, or the first connection link.