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Retry Sinkhorn on normalized cost; fix test build on main - #13
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October 31, 2026 12:57
Fixes the CI failure at afe8411: proptest's prelude now re-exports rand 0.10's Rng, so rng.random() on a rand_chacha 0.9 ChaCha8Rng no longer resolves and the lib tests and tests/degenerate_inputs.rs fail to compile. Import rand::Rng explicitly at both call sites. Checks: cargo clippy --all-targets --all-features -D warnings. Claude-Session: https://claude.ai/code/session_01UJZpXWPEdKXLtAA19wY4Sh
A single far outlier in a minibatch makes C/reg large enough that
log-domain Sinkhorn does not reach tol within max_iter, so
minibatch_ot_greedy_pairing and ot_cfm_coupling returned
Domain("sinkhorn coupling did not converge"). On non-convergence, retry
once with the cost divided by its maximum, as torchcfm's normalize_cost
does; a converged first attempt is unchanged. The comment now describes
both fallbacks.
Two tests use a 16x4 batch with one target at 1000: one checks the
result is a permutation, the other reverses the inliers and checks the
pairing costs less than identity. Both fail before this change; a
constant-cost retry reproduces identity and fails the cost test.
sinkhorn_selective_avoids_forcing_outlier_column hits the same
non-convergence in minibatch_ot_selective_pairing, which has no
fallback; a normalized retry there still uses the outlier column at
reg = 1. The test was hidden by the compile error fixed in the previous
commit; it is ignored with that reason until the selective path gets
its own fix.
Checks: cargo fmt --check, clippy -D warnings, tests, doctests, burn
check, CI examples, cargo semver-checks.
Claude-Session: https://claude.ai/code/session_01UJZpXWPEdKXLtAA19wY4Sh
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Rng, sorng.random()stopped resolving in the lib tests andtests/degenerate_inputs.rs. Both importrand::Rngexplicitly.minibatch_ot_greedy_pairing(andot_cfm_couplingthrough it) returnedDomain("sinkhorn coupling did not converge")on batches with a far outlier. On non-convergence it now retries once with the cost divided by its maximum, as torchcfm'snormalize_costdoes; a converged first attempt is unchanged. Two new tests (permutation; cheaper than identity) fail before the change.sinkhorn_selective_avoids_forcing_outlier_columnwas hidden by the compile error and fails on the same non-convergence inminibatch_ot_selective_pairing, which has no fallback; a normalized retry there still uses the outlier column at reg = 1. It is#[ignore]d with that reason until the selective path gets its own fix.Checks run: fmt, clippy
-D warnings, tests, doc tests, burn check, the CI examples, semver-checks.https://claude.ai/code/session_01UJZpXWPEdKXLtAA19wY4Sh