Connection Sampler
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Connection Sampler is now part of Wayfinder, where it is the sampler module (tools/wayfinder/sampler.py in the BootLoops repository, released under the MIT license). It recovers a canonical differential equation for a family of Feynman integrals from numerical values of the integrals at a few kinematic points, instead of reconstructing it symbolically. The unknowns it fits are the equation's constant rational matrices, one for each letter (a polynomial in the kinematic variables whose logarithm appears in the equation). Its command line, its Python functions (connection_once, sample_de, fit_dlog_connection, verify_connection), the example target files, and the tests are documented with the rest of Wayfinder. This address is kept only so that older links still resolve.