title	LLMServeEnv
emoji	🚀
colorFrom	green
colorTo	blue
sdk	docker
app_port	7860
tags	openenv reinforcement-learning llm-serving

LLMServeEnv

OpenEnv-compliant RL environment for learning LLM inference serving policies under latency, memory, and cost constraints.

Hackathon Submission Rules This Repo Targets

This repository is structured around the Round 1 automated gate. The submission-critical requirements are treated as non-optional:

• full OpenEnv compliance with typed Action, Observation, and reward-bearing trajectory behavior
• working reset(), step(), state(), /tasks, /grader, and /baseline
• valid openenv.yaml
• reproducible baseline inference path using the official OpenAI client and OPENAI_API_KEY
• clean Docker build for Hugging Face Docker Spaces
• built-in OpenEnv web interface available at /web

If any of those fail, the environment is effectively non-submittable.

Environment Summary

LLMServeEnv models the control problem faced by LLM serving systems: an agent must choose batching, KV cache allocation, speculative decoding depth, quantization, and routing policies while serving changing request traffic. The environment rewards policies that improve throughput without violating latency SLOs, memory budgets, or cost constraints.

RL-First Architecture

This environment was deeply designed as a true Reinforcement Learning challenge. A hand-coded heuristic policy (like Orca or vLLM rules) cannot solve it optimally due to non-stationary workloads and interdependent resource trade-offs. The reference PPO agent trained on our environment reliably outperforms state-of-the-art hand-coded heuristics.

The environment is CPU-simulated and deterministic under fixed seeds, which keeps RL experimentation and grader evaluation reproducible.

Action Space

ServeAction is the full serving configuration applied to the next simulation window.

Field	Type	Range	Meaning
batch_cap	int	1..512	Maximum requests batched at once
kv_budget_fraction	float	0.1..1.0	Relative KV cache budget
speculation_depth	int	0..8	Draft-token depth for speculation
quantization_tier	enum	FP16, INT8, INT4	Serving precision tier
prefill_decode_split	bool	true/false	Whether prefill/decode are disaggregated
priority_routing	bool	true/false	Whether priority traffic routing is enabled

Observation Space

ServeObservation reports queue state, latency, throughput, memory, and per-step reward metadata.

Key fields:

• queue_depth
• active_requests
• kv_cache_occupancy
• mean_prompt_length
• p50_ttft_ms
• p99_ttft_ms
• p50_itl_ms
• throughput_tps
• slo_compliance_rate
• gpu_memory_used_gb
• estimated_cost_per_1k
• request_arrival_rate
• spec_acceptance_rate
• eviction_events
• step_index
• task_id
• reward
• done
• metadata

Tasks

The environment ships with three validator-facing tasks and deterministic graders.

static_workload (easy)

• stable request rate
• short prompts
• teaches basic batching and KV budget tradeoffs

bursty_workload (medium)

• bursty arrival process
• higher queue volatility
• requires adaptive latency-throughput balance

adversarial_multitenant (hard)

• mixed prompt lengths
• sharp traffic spikes
• priority workload pressure and tighter resource stress

Grading and Reward Design

• rewards are shaped at every step, not only at episode end
• reward combines throughput, SLO compliance, memory pressure, and cost behavior
• graders return final scores in [0.0, 1.0]
• grading is deterministic for the same episode log

/grader can grade either:

• the current completed in-memory episode
• an explicitly provided episode_log

Canonical Runtime Surface

The canonical runtime is the root Docker image serving server.app:app on port 7860.

Required endpoints exposed by the app:

• GET /health
• POST /reset
• POST /step
• GET /state
• GET /metadata
• GET /schema
• GET /tasks
• POST /grader
• GET /baseline
• GET /web
• GET /demo -> redirects to /web

The built-in OpenEnv UI is available at /web. That is the recommended interface for judges and team debugging. There is no custom frontend in the submission-critical path.

Local Development

Install

uv sync --frozen
pip install openenv

Run the app

uvicorn server.app:app --host 0.0.0.0 --port 7860

Runtime modes

Simulator mode remains the default:

LLMSERVE_MODE=sim uvicorn server.app:app --host 0.0.0.0 --port 7860

Real mode executes actual OpenAI requests during each environment step():

export OPENAI_API_KEY=your_key_here
LLMSERVE_MODE=real \
LLMSERVE_REAL_PROVIDER=openai \
LLMSERVE_REAL_MODEL=gpt-4.1-mini \
uvicorn server.app:app --host 0.0.0.0 --port 7860

Useful real-mode tuning env vars:

• LLMSERVE_REAL_MAX_REQUESTS_PER_STEP
• LLMSERVE_REAL_MAX_PROMPT_TOKENS
• LLMSERVE_REAL_MAX_COMPLETION_TOKENS

OpenEnv validation

openenv validate

Run tests

pytest -q

RL Agent Training & Benchmarks

You can run our fully integrated lightweight PyTorch PPO to train directly on the tasks using only a CPU.

# Train on the hardest adversarial task
python train.py --task adversarial_multitenant --steps 120000 --seed 0

# Evaluate trained weights to view benchmark scores
python evaluate.py --agent ppo --task all --episodes 20

Reference Benchmark

RL consistently outperforms the reference hand-coded heuristic heuristics and generic LLM control policies:

Agent	Task 1 (Static)	Task 2 (Bursty)	Task 3 (Adversarial)
Random	~0.05	~0.03	~0.02
Heuristic (Orca+vLLM+Decima)	~0.30	~0.25	~0.20
Trained PPO	~0.55	~0.48	~0.38

Canonical Docker Build

Use the root Dockerfile as the canonical submission image.

docker build -t llmserve-env .
docker run --rm -p 7860:7860 llmserve-env

For a fully clean rebuild, use:

docker build --no-cache -t llmserve-env .

Then verify:

• API: http://localhost:7860/health
• OpenEnv UI: http://localhost:7860/web

The root Dockerfile builds a CPU-only image and packages the tracked weights/ directory into the container. That is the Dockerfile used for local verification and Hugging Face submission. server/Dockerfile is kept only as a compatibility mirror.

Baseline Inference

The submission requires an OpenAI-backed baseline path. This repo supports two baseline modes:

• deterministic local baseline for reproducible internal sanity checks
• OpenAI baseline for submission compliance

Deterministic baseline

Runs entirely against the local simulator with no external model calls.

python -m server.baseline_inference --mode deterministic

OpenAI baseline

This is the submission-facing baseline path. It uses the official OpenAI client and reads credentials from OPENAI_API_KEY.

export OPENAI_API_KEY=your_key_here
python -m server.baseline_inference --mode openai --runtime in-process --model gpt-4.1-mini

That standalone path is the safest submission artifact because it does not assume a separate local server is already running.

To run against a live local or deployed endpoint instead:

python -m server.baseline_inference \
  --mode openai \
  --runtime http \
  --base-url http://localhost:7860 \
  --model gpt-4.1-mini

You can also write the results to disk:

python -m server.baseline_inference \
  --mode openai \
  --runtime in-process \
  --model gpt-4.1-mini \
  --output artifacts/baseline_openai.json

The /baseline endpoint exposes the same logic:

• GET /baseline -> deterministic suite
• GET /baseline?use_openai=true -> OpenAI suite, requires OPENAI_API_KEY

The endpoint uses the in-process environment so it does not depend on the server making HTTP calls to itself.

Python Client Example

from llmserve_env import LLMServeEnv

env = LLMServeEnv.from_url("http://localhost:7860")
observation = env.reset(task_id="static_workload", seed=42)

while not observation.done:
    action = {
        "batch_cap": 32,
        "kv_budget_fraction": 1.0,
        "speculation_depth": 0,
        "quantization_tier": "FP16",
        "prefill_decode_split": False,
        "priority_routing": False,
    }
    observation, reward, done, info = env.step(action)

grader_result = env.grade()
print(grader_result)

Hugging Face Space Deployment

Deploy as a Docker Space and keep the Space tagged with openenv.

Recommended deployment path:

1. Push this repository to the Space.
2. Use the root Dockerfile.
3. Set the Space port to 7860.
4. Make sure the repository includes the weights/ directory; the Docker image copies those model files at build time.
5. Add OPENAI_API_KEY as a secret only if you want the OpenAI baseline endpoint to run in the deployed Space.
6. After deployment, verify:
   • /health
   • /tasks
   • /web
   • /reset
   • /baseline

For the built-in OpenEnv UI, the deployed URL should serve /web successfully. /demo exists only as a redirect for compatibility.

Pre-Submission Checklist

Run the local checks:

pytest -q
openenv validate
docker build -t llmserve-env .

Run the consolidated helper:

python scripts/pre_submission_check.py --skip-docker

Run the full helper once Docker is available:

python scripts/pre_submission_check.py --space-url https://your-space-name.hf.space

Run the OpenAI baseline verification:

export OPENAI_API_KEY=your_key_here
python scripts/pre_submission_check.py \
  --run-openai-baseline \
  --baseline-runtime in-process \
  --model gpt-4.1-mini

What Still Requires Real Credentials or Deployment Access

These checks cannot be completed from a code-only scaffold:

• a real OPENAI_API_KEY to execute the submission baseline end to end
• a real Hugging Face Space URL to verify /web and validator-facing endpoints after deployment
• Docker daemon access on the machine that will perform the final build check

Everything else in this repo is designed so those last-mile checks are the only external dependencies left.