Is GitHub a derivative work of GPL'd software?

GitHub recently announced a tool called Copilot, a tool which uses machine learning to provide code suggestions, inciting no small degree of controversy. One particular facet of the ensuing discussion piques my curiosity: what happens if the model was trained using software licensed with the GNU General Public License? Disclaimer: I am the founder of a company which competes with GitHub. The GPL is among a family of licenses considered “copyleft”, which are characterized by their “viral” nature....

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