Custom factors are one of the fastest ways to prototype new residuals in GTSAM, and they now work across Python, C++, and MATLAB. Here is an example with localization from known landmarks:

Apr 13, 2026 · 4:58 PM UTC

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Localization example notebook here: borglab.github.io/gtsam/cust…
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BTW, this localization notebook was authored entirely by OpenAI’s Codex 5.4, translating the c++ example I discuss in the blog post.
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