jgrusewski
aa272666a1
feat: 8-component composite reward CUDA kernel
Replace raw PnL reward in experience_env_step with GPU-native composite:
- DSR (Moody & Saffell 2001) with pre-update A/B formulation
- Z-scored normalized PnL with running EMA
- Drawdown penalty with peak_equity guard
- Idle penalty (replaces hold_reward)
- Regime-adaptive scaling from ADX/CUSUM features
- Asymmetric loss scaling (prospect theory)
- Position-time decay (stale position rent)
- Transaction cost (unchanged)
PORTFOLIO_STRIDE=12 (was 3). portfolio_sim_kernel stride-8 unchanged.
All division-by-zero guards per spec. ~25 FLOPs overhead (<5%).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-22 20:49:51 +01:00
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