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ai-agent-book/chapter9/gaia-experience/test_kb_faiss_negative_idx.py
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ai-agent-book 精选快照(<2MB 代码与文档,来自 github.com/bojieli/ai-agent-book)
2026-08-20 13:12:50 +00:00

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Python

"""Regression: FAISS padding index -1 must not map to documents[-1]."""
from pathlib import Path
def test_search_guards_negative_indices():
src = Path(__file__).with_name("knowledge_base.py").read_text()
assert "0 <= idx < len(self.documents)" in src
documents = [{"id": i} for i in range(3)]
indices = [0, -1, -1]
results = [documents[idx] for idx in indices if 0 <= idx < len(documents)]
assert results == [{"id": 0}]
def test_index_dimension_tracks_model_and_rebuilds_on_mismatch():
"""The FAISS index dimension must come from the loaded model (not a fixed
384), and a persisted index built with a different model must be rebuilt on
load — otherwise every add()/search() raises a swallowed dimension mismatch
and semantic search silently degrades to keyword-only."""
src = Path(__file__).with_name("knowledge_base.py").read_text()
assert "get_sentence_embedding_dimension()" in src
assert "self.index.d != self.embedding_dim" in src
assert "_rebuild_index_from_metadata" in src