---
title: An Evidence-Driven Solver Router: Regret 0.046 vs 0.190 for the Best Single Backend | SpinForge
url: https://spin-forge.com/proof/s07
description: 0.046: mean regret vs the oracle, 276 instances. Rules Decided on a Training Split, Checked Out of Sample, Every Answer Verified; on the GPU 93/166/11 vs…
---

GARMO SOLVERS · S07

# An Evidence-Driven Solver Router: Regret 0.046 vs 0.190 for the Best Single Backend

Rules Decided on a Training Split, Checked Out of Sample, Every Answer Verified; on the GPU 93/166/11 vs the CPU.

0.046 mean regret vs the oracle, 276 instances

214/276 oracle hits

93/166/11 router on cuda vs cpu

0 planted wrong answers accepted

- Router regret 0.046 (train 0.049, test 0.042) vs 0.190 best single per kind
- Rules HOLD out of sample on 14 of 15
- GPU vs CPU routing: 93/166/11
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