708c121f20
kc2h9 confirmed: clamping streaming-kernel outputs to [≤100, ≤30]
had ZERO behavioral impact because rl_rollout_steps_controller's
prior design used `scale = clamp(input/target, 0.5, 2.0)` — the
scale saturated to ±2× on the SIGN of (input − target), not the
magnitude. With target=0.1 and typical input=1–10 the controller
slammed to MAX in ≤4 steps regardless of whether input was 4 or
3e5. Bit-identical losses between gxhr8 and kc2h9 confirmed the
saturation.
## Fix 1: rl_rollout_steps_controller — same Schulman pattern as ppo_clip
* input > TARGET × 1.5 → scale = 1.5 (widen)
* input < TARGET / 1.5 → scale = 1/1.5 (shrink)
* in-band → scale = 1.0 (hold)
* input < TARGET × 0.01 → return (noise floor — hold prev)
Per-step adjustment bounded at 1.5×, so rollout_steps drifts
smoothly toward MIN/MAX rather than slamming there. The noise-floor
gate matches the pattern from
`pearl_multiplicative_controllers_need_bounded_step_and_noise_floor`
applied to the ε and τ controllers earlier in R9.
## Fix 2: rl_per_alpha_controller — noise-floor gate (defensive)
per_α uses a LINEAR lift `0.4 + 0.2·(kurt-3)/7` (not multiplicative),
so it doesn't have the saturation bug. But added a noise-floor gate
at KURT_NOISE_FLOOR = 1.0 so a sub-Gaussian kurtosis reading from
the streaming estimator's startup window (when per-step batch-mean
deviations are small before tails develop) doesn't drag α toward
PER_ALPHA_MIN on cold-start.
## Diag bake-in (per user request "bake in diags")
JSONL gains a `controller_branch` block exposing the
multiplicative-controller inputs alongside their design targets:
controller_branch: {
rollout_steps_input: isv[421], rollout_steps_target: 0.1,
ppo_clip_input: isv[419], ppo_clip_target: 0.01,
target_tau_input: isv[418], target_tau_target: 0.01,
per_alpha_input: isv[422], per_alpha_target: 0.6,
}
Post-hoc analysis can compute the branch each step (WIDEN / HOLD /
SHRINK / NOISE) by comparing input/target against the ±33%
tolerance band, revealing whether each controller is being driven
by real signal or sitting in the in-band hold zone. Targets are
reflected from the kernel #defines (synchronised by code review at
the controller-cu file level — there's no ISV slot for these
design constants because they're fundamental to the controller's
behaviour, not adaptive).
## Verified gates (local sm_86)
G1 isv_bootstrap ✅
G3 controllers ✅
G4 target_update ✅
integrated_smoke ✅
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Foxhunt
Production HFT trading system in Rust.
Architecture
The workspace contains 32 crates organized as follows:
Core Libraries (16)
| Crate | Purpose |
|---|---|
trading_engine |
Order processing, FIX 4.4, IB TWS, SIMD, RDTSC timing |
risk |
VaR, Kelly, circuit breakers, kill switches, compliance |
risk-data |
Risk data types and shared structures |
trading-data |
Trading data types |
ml |
DQN Rainbow, PPO, TFT, Mamba2, ensemble inference |
ml-data |
ML data types and feature definitions |
data |
Market data ingestion and storage |
backtesting |
Replay engine, strategy tester |
adaptive-strategy |
Ensemble execution, microstructure analysis |
common |
Shared types, resilience, error handling |
storage |
S3 and local model storage |
model_loader |
Model serialization and loading |
market-data |
Market data feed handlers |
database |
PostgreSQL access layer (SQLx) |
config |
Configuration management |
tli |
CLI commands and tooling |
Services (8)
| Service | Purpose |
|---|---|
backtesting_service |
gRPC backtesting service |
broker_gateway_service |
FIX routing, broker connectivity |
trading_service |
Core trading operations |
ml_training_service |
Model training orchestration |
data_acquisition_service |
Market data acquisition |
trading_agent_service |
Autonomous trading agents |
api_gateway |
gRPC API gateway with auth |
web-gateway |
Axum REST + WebSocket gateway |
Frontend
web-dashboard/ -- React 19 + TypeScript + Vite + TradingView charts.
Building
# Check compilation (no PostgreSQL required)
SQLX_OFFLINE=true cargo check --workspace
# Run tests for a specific crate
SQLX_OFFLINE=true cargo test -p <crate> --lib
# Clippy
SQLX_OFFLINE=true cargo clippy --workspace
ML Models
Four production model architectures on Candle v0.9.1 with CUDA:
- DQN Rainbow -- Deep Q-Network with prioritized replay, dueling heads, noisy nets
- PPO -- Proximal Policy Optimization with GAE and LSTM policies
- TFT -- Temporal Fusion Transformer for multi-horizon forecasting
- Mamba2 -- State space model for sequence prediction
Each model has a standalone trainer and a UnifiedTrainable adapter for the hyperopt pipeline.
Infrastructure
- Git: Gitea at
git.fxhnt.ai(Tailscale-only), Scaleway DEV1-S - Observability: OpenTelemetry OTLP (env
OTEL_EXPORTER_OTLP_ENDPOINT) - Database: PostgreSQL with SQLx offline mode for CI
License
Proprietary. All rights reserved.