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feat: make fusion weights configurable via environment variables #100

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5fc5461
docs: add fusion weights to env template
Nabhye Mar 27, 2026
3ffb608
Merge branch 'main' into fix-env-config-weights
Nabhye Mar 31, 2026
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5 changes: 5 additions & 0 deletions .env.template
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Original file line number Diff line number Diff line change
Expand Up @@ -26,5 +26,10 @@ ELASTIC_BASE_URL=
ELASTIC_USERNAME=
ELASTIC_PASSWORD=
PAGE_SIZE=1000

# Fusion weights (result ranking)
FUSION_VECTOR_WEIGHT=0.6
FUSION_KS_WEIGHT=0.4

GCS_BUCKET=
GCS_PREFIX=
13 changes: 10 additions & 3 deletions backend/agents.py
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Expand Up @@ -14,6 +14,13 @@
from ks_search_tool import general_search, general_search_async, global_fuzzy_keyword_search
from retrieval import get_retriever

# Fusion weights configurable via environment variables
VECTOR_WEIGHT = float(os.getenv("FUSION_VECTOR_WEIGHT", "0.6"))
KS_WEIGHT = float(os.getenv("FUSION_KS_WEIGHT", "0.4"))

# Defaults preserve existing behavior (vector=0.6, keyword search=0.4)
if any(w < 0 for w in (VECTOR_WEIGHT, KS_WEIGHT)):
raise ValueError("Fusion weights must be non-negative")

# LLM (Gemini) client setup
try:
Expand Down Expand Up @@ -443,14 +450,14 @@ def fuse_results(state: AgentState) -> AgentState:
for res in vector_results:
if isinstance(res, dict):
doc_id = res.get("id") or res.get("_id") or f"vec_{len(combined)}"
combined[doc_id] = {**res, "final_score": res.get("similarity", 0) * 0.6}
combined[doc_id] = {**res, "final_score": res.get("similarity", 0) * VECTOR_WEIGHT}
for res in ks_results:
if isinstance(res, dict):
doc_id = res.get("_id") or res.get("id") or f"ks_{len(combined)}"
if doc_id in combined:
combined[doc_id]["final_score"] += res.get("_score", 0) * 0.4
combined[doc_id]["final_score"] += res.get("_score", 0) * KS_WEIGHT
else:
combined[doc_id] = {**res, "final_score": res.get("_score", 0) * 0.4}
combined[doc_id] = {**res, "final_score": res.get("_score", 0) * KS_WEIGHT}
all_sorted = sorted(combined.values(), key=lambda x: x.get("final_score", 0), reverse=True)
logger.info(
"Results summary: KS=%d, Vector=%d, Combined=%d",
Expand Down