60 lines
1.8 KiB
Python
60 lines
1.8 KiB
Python
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"""Worked example: how a later agent plugs a retriever into the harness.
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A retriever needs only one method:
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retrieve(self, query: str, k: int) -> list[int] # ranked memory ids
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Optionally it may implement lifecycle hooks the runner will use if present:
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build_index(self, corpus: list[Memory]) -> None # timed separately
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index_size_bytes(self) -> int # reported
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Run this file directly for a smoke test against the local eval set:
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.venv/bin/python -m harness.example_retriever
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"""
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from __future__ import annotations
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from collections.abc import Sequence
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from .types import Memory, MemoryId
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class SubstringRetriever:
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"""Trivial baseline: rank by count of query-word occurrences in content.
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Deliberately weak — exists only to demonstrate the interface. The real
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lexical baseline is harness.baselines.SqliteFtsRetriever.
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"""
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name = "substring_demo"
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def __init__(self) -> None:
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self._corpus: list[Memory] = []
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def build_index(self, corpus: Sequence[Memory]) -> None:
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self._corpus = list(corpus)
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def retrieve(self, query: str, k: int) -> list[MemoryId]:
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words = [w for w in query.lower().split() if len(w) > 2]
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scored: list[tuple[int, float]] = []
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for m in self._corpus:
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hay = (m.content + " " + m.expanded_keywords + " " + m.tags).lower()
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score = sum(hay.count(w) for w in words)
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if score:
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scored.append((m.id, score + m.importance)) # importance tiebreak
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scored.sort(key=lambda t: t[1], reverse=True)
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return [mid for mid, _ in scored[:k]]
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def _smoke() -> None:
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from .dataset import load_dataset
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from .runner import run_benchmark
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ds = load_dataset()
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res = run_benchmark(SubstringRetriever(), ds)
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print(res.summary())
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if __name__ == "__main__":
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_smoke()
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