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Artifex/gpu_feature_parity_contract_v1.md
Daniel Maddern 203bc7917a Add GPU parity and feature gap analysis
2026-08-18 20:45:09 +07:00

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GPU Feature Parity Contract V1

Status: accepted.

The contract requires exact structure and NaN placement, exact decision/state-transition conditions, and per-family measured numeric limits. Numeric drift is never accepted when it changes a decision.

Family Limits

  • bollinger: max abs 1.8262653611600399e-09, max rel 2.9899920253705082e-14, max ULP 251, MAE 6.4296249767118589e-10.
  • supertrend: max abs 0, max rel 0, max ULP 0, MAE 0.
  • donchian: max abs 0, max rel 0, max ULP 0, MAE 0.
  • keltner: max abs 2.9103830456733704e-11, max rel 4.2852960505130111e-16, max ULP 2, MAE 9.9198121522888284e-16.
  • psar: max abs 0, max rel 0, max ULP 0, MAE 0.

Gates

  • Shapes, dtypes, and NaN masks must match exactly.
  • Price-comparison signs, crossings above/below, and state-transition conditions must match exactly.
  • Bollinger and Keltner upper/lower relationships must match exactly.