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[Mirror] SC exact NNLS donor weights - CI-review mirror of PR #842
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[Mirror] SC exact NNLS donor weights - CI-review mirror of PR #842
#848
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fix(synthetic_control): solve the donor weights exactly by non-negative least squares
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docs(synthetic_control): drop the last inner_max_iter remedies and re-execute Tutorial 25 on top of #841
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feat(synthetic_control): deprecate the inert inner-solve budget params and flag a step-guard exhaustion instead of raising
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fix(utils): make the NNLS conditioning scale overflow-safe, fail closed on a non-finite difference, and apply the ridge per passive set
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fix(utils): solve a ridge-dominated passive set by its regularized normal equations
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fix(utils): equilibrate the donor columns inside the NNLS reduction so heterogeneous donor scales are solved exactly
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fix(utils): fail the NNLS solve closed on any non-finite intermediate and scope its magnitude claim to the float64 range
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test(synthetic_control): pin objective parity for opposing large donors beside a small one
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Commits on Oct 16, 2026
docs(prep): describe synthetic_weight as the thresholded, renormalized exact solve
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fix(prep): surface a non-converged synthetic_weight solve instead of presenting its fallback as the solution
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fix(prep): reject infinite pre-period outcomes in rank_control_units instead of routing them to the missing-data fallback
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fix(prep): check for infinite outcomes only on the units that enter the ranking
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docs(synthetic_control): name both causes of an inner-solve non-convergence in the warning
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test(synthetic_control): pin the rounding floor, not the vertex ordering, in the opposing-large-donors case
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