644fbe0348
f2ggr confirmed K-loop wiring works mechanically but K=8 firing on
22 % of steps over-trained at b_size=1: KL excursions to 12.44
(vs prior 3.4e-4), policy overshoot, reward/trade -$0.585 → -$0.723.
Per `feedback_isv_for_adaptive_bounds` the K-loop config must live
in ISV, not as hardcoded values in the trainer. Two new slots:
RL_K_LOOP_DIVISOR_INDEX (450) — divides n_rollout_steps to get K
Default 2048 (matches ROLLOUT_BOOTSTRAP
so K=1 at controller bootstrap)
RL_K_LOOP_MAX_INDEX (451) — clamp ceiling on K
Default 4 (was hardcoded 8; halved
to prevent gradient overtraining)
K computation in step_with_lobsim now reads both from ISV:
K = clamp(isv[404] / isv[450], 1, isv[451])
Halves worst-case overtraining while preserving the controller
cascade activation (KL above noise floor, ε actively adapting,
ratio_clamp firing). Distribution shifts from K=8 @ 22% → K=4 @ 22%
(half the gradient updates in the high-noise case).
## Wiring
`rl_streaming_clamp_init.cu` extended to seed 5 ISV-resident design
constants (was 3): adv_var_clamp, td_kurt_clamp, adv_var_target,
k_loop_divisor, k_loop_max. Still one kernel call, no HtoD.
## Diag bake-in
JSONL `k_updates` field replaced with `k_loop` block:
k_loop.k_updates — actual K used this step
k_loop.divisor — current divisor (reads isv[450])
k_loop.max — current max (reads isv[451])
Post-hoc analysis can verify the K-computation by independently
recomputing K from isv[404] / k_loop.divisor.
## Slot allocation
RL_SLOTS_END: 450 → 452 (+2 new config slots).
## Test updates
G1 + G3 skip slots 450, 451 in sentinel-zero loop and assert seeded
values (2048.0 + 4.0) separately.
## 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.