groundhog-researcher 0.2.13

LLM-powered iterative function optimization

Groundhog Researcher

They called it Groundhog Day. But what was the groundhog doing? Running experiments. Keeping notes. Getting better, one iteration at a time.

LLM-powered function optimization. Define how to score your code, and the groundhog iterates overnight. Wake up to a better solution.

Install

uv tool install groundhog-researcher

This gives you the groundhog CLI (and ghg alias).

Quick start

# See what LLM backends you have available
groundhog backends

# Scaffold a task
groundhog init my_task           # basic template
# groundhog init-llm my_task    # detailed template with full LLM guide
# groundhog init-mock my_task   # mock task, no LLM needed, for testing
# groundhog init-mnist my_task  # 5 sample MNIST digit classification, real ML task

cd my_task
uv run python task.py 10

# Check progress anytime
uv run python task.py status

Works with whatever LLM you have — Claude Code, GitHub Copilot, API keys, Ollama. auto_registry() discovers available backends automatically.

Prefer a backend

groundhog prefer copilot                              # use copilot for all tiers
groundhog prefer-tier max copilot claude-sonnet-4.6    # override one tier
groundhog prefer reset                                 # back to auto-discovery

CLI commands

groundhog init [dir]              Basic task template
groundhog init-llm [dir]          Detailed template with full LLM guide
groundhog init-mock [dir]         Mock task (no LLM needed, for testing)
groundhog init-mnist [dir]        MNIST example (real ML task)

groundhog new strategy [file]     Custom strategy template
groundhog new backend [file]      Custom backend template

groundhog backends                Show available backends and tier assignments
groundhog prefer <backend>        Prefer a backend for all tiers
groundhog prefer-tier <tier> <backend> [model]
groundhog prefer reset            Reset all preferences

groundhog --version

Write a task from scratch

One file is everything:

# /// script
# dependencies = ["groundhog-researcher", "python-dotenv"]
# ///

from dotenv import load_dotenv
load_dotenv()

from groundhog import (
    Task, Data, Context, Evaluator, EvalStage, StageResult,
    SimpleOptimizer, Improve, auto_registry,
)


class MyData(Data):
    def get_train(self):
        return {"inputs": [...], "targets": [...]}

    def get_test(self):
        return {"inputs": [...], "targets": [...]}


class MyContext(Context):
    def get_brief(self):
        return "Write a function that solves X."

    def get_extended(self):
        return "Write `solve(data)` that maximizes Y. Rules: ..."


class MyEvaluator(Evaluator):
    def evaluate(self, code_or_path, data):
        code = code_or_path if isinstance(code_or_path, str) else (code_or_path / "solution.py").read_text(encoding="utf-8")
        return StageResult(metrics={"score": 0.85, "time": 1.2})

    def get_stages(self, data):
        return [
            EvalStage("smoke", "Quick syntax check", lambda cp: ...),
            EvalStage("evaluate", "Full evaluation",
                      lambda cp: self.evaluate(cp, data)),
        ]


task = Task(data=MyData(), context=MyContext(), evaluator=MyEvaluator(), name="MyTask")

optimizer = SimpleOptimizer(task, strategy=Improve())
optimizer.toolkit.llm = auto_registry()
optimizer.run(n=100)

What happens

The optimizer works in the current directory:

my_task/
    task.py                 # your task definition + entry point
    .env                    # API keys (optional)
    learnings.md            # what the optimizer has learned
    attempts/               # every candidate
        001_none/           # first attempt (no parent)
            solution.py
            result.json
            conversation.json
        002_1/              # second attempt (parent=1)
            ...

The loop:

1. Selects a prior (best attempt, weighted by potential)
2. Runs a strategy (improve, explore, combine ideas)
3. Evaluates -- raw results stored, scored via stage scorers
4. Records the attempt in an immutable attempt tree
5. Updates learnings
6. Repeats

Every attempt is kept. Nothing discarded. Change what "good" means later -- the history is reinterpretable.

Multi-strategy optimizer

Run multiple strategies in a weighted rotation:

from groundhog import Improve, FreshApproach, CrossPollinate

optimizer = SimpleOptimizer(
    task,
    strategies=[
        (Improve(), 14),                          # 14 refinement steps
        (CrossPollinate(), 5),                     # 5 cross-pollination steps
        (FreshApproach(mode="different"), 1),       # 1 fresh exploration
    ],
    seed_strategy=FreshApproach(mode="blank"),      # seed with pure exploration
)

Backend tiers

auto_registry() discovers what's available and assigns 5 tiers (max, high, default, budget, cheap). Or configure manually:

from groundhog import BackendRegistry, AnthropicBackend, GeminiBackend, OpenAICompatibleBackend

optimizer.toolkit.llm = BackendRegistry(
    high=AnthropicBackend(model="claude-opus-4-6-20260205"),
    default=GeminiBackend(model="gemini-2.5-flash"),
    cheap=OpenAICompatibleBackend.ollama(model="llama3"),
)

Override individual tiers after auto-discovery:

optimizer.toolkit.llm = auto_registry()
optimizer.toolkit.llm.set("high", AnthropicBackend(model="claude-opus-4-6-20260205"))

Available backends:

Type	Backends
API	OpenAICompatibleBackend (.openai, .deepseek, .groq, .cerebras, .xai, .together, .fireworks, .ollama, .openrouter, ...), AnthropicBackend, GeminiBackend
CLI	ClaudeCodeBackend, CopilotBackend, GeminiCLIBackend, OpenCodeBackend

Building a custom strategy

groundhog new strategy my_strategy.py    # generates a documented template

Or subclass directly:

from dataclasses import dataclass
from groundhog import Strategy, StrategyConfig, param

@dataclass
class MyConfig(StrategyConfig):
    temperature: float = param(0.7, "LLM sampling temperature")
    max_retries: int = param(3, "Retry attempts on failure")

class MyStrategy(Strategy):
    Config = MyConfig

    def __call__(self, toolkit, config=None):
        cfg = self._resolve_config(config)
        ws = toolkit.history.workspace(parent=None)
        # ... generate code, write to ws.path / "solution.py" ...
        result = toolkit.task.evaluate(ws.path, through="evaluate")
        attempt = ws.commit(result, metadata={"strategy": "mine"})
        return {"attempt": attempt.number}

Core concepts

Concept	What it is
Task	Your problem: data + context + evaluator
Strategy	An action that moves the state forward (improve, explore, combine, analyse)
Attempt History	Immutable tree of every candidate and its raw results
Scorer	Per-stage callable that maps raw results to scores -- change it without re-running
Learnings	What the optimizer has learned about how to optimize your task
Toolkit	Capabilities available to strategies (LLMs, history, learnings, logging)

Architecture

base/           # interfaces only -- Task, Strategy, Optimizer, AttemptHistory, etc.
strategies/     # Improve, FreshApproach, CrossPollinate, Analyse
optimizers/     # SimpleOptimizer
histories/      # FolderAttemptHistory
backends/       # Gemini, Anthropic, OpenAI-compatible, Claude Code CLI, + more
learnings/      # MarkdownLearnings
acceptance/     # DefaultAcceptance
tools/          # conversation_log, cost_estimate, StrategyLog, queue
utils/          # codegen, subprocess_runner, selection
templates/      # task scaffolding templates (used by groundhog init)

base/ defines interfaces. Everything else is implementations. Build your own by subclassing the interfaces.

License

MIT