Merge remote-tracking branch 'wortiz/autodiff' into autodiff · wortiz/goma@26d9d0e

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

unused variable 'n' [-Wunused-variable]

unused variable 't' [-Wunused-variable]

unused variable 'v_length' [-Wunused-variable]

unused variable 'k' [-Wunused-variable]

unused variable 'b' [-Wunused-variable]

unused variable 'v' [-Wunused-variable]

unused variable 'vi' [-Wunused-variable]

variable 'siz' set but not used [-Wunused-but-set-variable]

unused variable 'interp_eqn' [-Wunused-variable]

unused variable 'factor' [-Wunused-variable]

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