fleet-memory/hindsight-api/hindsight_api/engine/search/retrieval.py
Nicolò Boschi 59913086be
fix: batch queries on recall (#149)
* fix: batch queries on recall

* fix: batch queries on recall
2026-01-13 13:20:22 +01:00

1267 lines
48 KiB
Python

"""
Retrieval module for 4-way parallel search.
Implements:
1. Semantic retrieval (vector similarity)
2. BM25 retrieval (keyword/full-text search)
3. Graph retrieval (via pluggable GraphRetriever interface)
4. Temporal retrieval (time-aware search with spreading)
"""
import asyncio
import logging
from dataclasses import dataclass, field
from datetime import UTC, datetime
from typing import Optional
from ...config import get_config
from ..db_utils import acquire_with_retry
from ..memory_engine import fq_table
from .graph_retrieval import BFSGraphRetriever, GraphRetriever
from .link_expansion_retrieval import LinkExpansionRetriever
from .mpfp_retrieval import MPFPGraphRetriever
from .types import MPFPTimings, RetrievalResult
logger = logging.getLogger(__name__)
@dataclass
class ParallelRetrievalResult:
"""Result from parallel retrieval across all methods."""
semantic: list[RetrievalResult]
bm25: list[RetrievalResult]
graph: list[RetrievalResult]
temporal: list[RetrievalResult] | None
timings: dict[str, float] = field(default_factory=dict)
temporal_constraint: tuple | None = None # (start_date, end_date)
mpfp_timings: list[MPFPTimings] = field(default_factory=list) # MPFP sub-step timings per fact type
max_conn_wait: float = 0.0 # Maximum connection acquisition wait time across all methods
@dataclass
class MultiFactTypeRetrievalResult:
"""Result from retrieval across all fact types."""
# Results per fact type
results_by_fact_type: dict[str, ParallelRetrievalResult]
# Aggregate timings
timings: dict[str, float] = field(default_factory=dict)
# Max connection wait across all operations
max_conn_wait: float = 0.0
# Default graph retriever instance (can be overridden)
_default_graph_retriever: GraphRetriever | None = None
def get_default_graph_retriever() -> GraphRetriever:
"""Get or create the default graph retriever based on config."""
global _default_graph_retriever
if _default_graph_retriever is None:
config = get_config()
retriever_type = config.graph_retriever.lower()
if retriever_type == "mpfp":
_default_graph_retriever = MPFPGraphRetriever()
logger.info(
f"Using MPFP graph retriever (top_k_neighbors={_default_graph_retriever.config.top_k_neighbors})"
)
elif retriever_type == "bfs":
_default_graph_retriever = BFSGraphRetriever()
logger.info("Using BFS graph retriever")
elif retriever_type == "link_expansion":
_default_graph_retriever = LinkExpansionRetriever()
logger.info("Using LinkExpansion graph retriever")
else:
logger.warning(f"Unknown graph retriever '{retriever_type}', falling back to link_expansion")
_default_graph_retriever = LinkExpansionRetriever()
return _default_graph_retriever
def set_default_graph_retriever(retriever: GraphRetriever) -> None:
"""Set the default graph retriever (for configuration/testing)."""
global _default_graph_retriever
_default_graph_retriever = retriever
async def retrieve_semantic(
conn, query_emb_str: str, bank_id: str, fact_type: str, limit: int
) -> list[RetrievalResult]:
"""
Semantic retrieval via vector similarity.
Args:
conn: Database connection
query_emb_str: Query embedding as string
agent_id: bank ID
fact_type: Fact type to filter
limit: Maximum results to return
Returns:
List of RetrievalResult objects
"""
results = await conn.fetch(
f"""
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
1 - (embedding <=> $1::vector) AS similarity
FROM {fq_table("memory_units")}
WHERE bank_id = $2
AND embedding IS NOT NULL
AND fact_type = $3
AND (1 - (embedding <=> $1::vector)) >= 0.3
ORDER BY embedding <=> $1::vector
LIMIT $4
""",
query_emb_str,
bank_id,
fact_type,
limit,
)
return [RetrievalResult.from_db_row(dict(r)) for r in results]
async def retrieve_bm25(conn, query_text: str, bank_id: str, fact_type: str, limit: int) -> list[RetrievalResult]:
"""
BM25 keyword retrieval via full-text search.
Args:
conn: Database connection
query_text: Query text
agent_id: bank ID
fact_type: Fact type to filter
limit: Maximum results to return
Returns:
List of RetrievalResult objects
"""
import re
# Sanitize query text: remove special characters that have meaning in tsquery
# Keep only alphanumeric characters and spaces
sanitized_text = re.sub(r"[^\w\s]", " ", query_text.lower())
# Split and filter empty strings
tokens = [token for token in sanitized_text.split() if token]
if not tokens:
# If no valid tokens, return empty results
return []
# Convert query to tsquery using OR for more flexible matching
# This prevents empty results when some terms are missing
query_tsquery = " | ".join(tokens)
results = await conn.fetch(
f"""
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
ts_rank_cd(search_vector, to_tsquery('english', $1)) AS bm25_score
FROM {fq_table("memory_units")}
WHERE bank_id = $2
AND fact_type = $3
AND search_vector @@ to_tsquery('english', $1)
ORDER BY bm25_score DESC
LIMIT $4
""",
query_tsquery,
bank_id,
fact_type,
limit,
)
return [RetrievalResult.from_db_row(dict(r)) for r in results]
async def retrieve_semantic_bm25_combined(
conn,
query_emb_str: str,
query_text: str,
bank_id: str,
fact_types: list[str],
limit: int,
) -> dict[str, tuple[list[RetrievalResult], list[RetrievalResult]]]:
"""
Combined semantic + BM25 retrieval for multiple fact types in a single query.
Uses CTEs with window functions to get top-N results per fact type per method,
all in one database round-trip.
Args:
conn: Database connection
query_emb_str: Query embedding as string
query_text: Query text for BM25
bank_id: Bank ID
fact_types: List of fact types to retrieve
limit: Maximum results per method per fact type
Returns:
Dict mapping fact_type -> (semantic_results, bm25_results)
"""
import re
# Sanitize query text for BM25 (same as retrieve_bm25)
sanitized_text = re.sub(r"[^\w\s]", " ", query_text.lower())
tokens = [token for token in sanitized_text.split() if token]
# If no valid tokens for BM25, just run semantic
if not tokens:
results = await conn.fetch(
f"""
WITH semantic_ranked AS (
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
1 - (embedding <=> $1::vector) AS similarity,
NULL::float AS bm25_score,
'semantic' AS source,
ROW_NUMBER() OVER (PARTITION BY fact_type ORDER BY embedding <=> $1::vector) AS rn
FROM {fq_table("memory_units")}
WHERE bank_id = $2
AND embedding IS NOT NULL
AND fact_type = ANY($3)
AND (1 - (embedding <=> $1::vector)) >= 0.3
)
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
similarity, bm25_score, source
FROM semantic_ranked
WHERE rn <= $4
""",
query_emb_str,
bank_id,
fact_types,
limit,
)
# Group by fact_type
result_dict: dict[str, tuple[list[RetrievalResult], list[RetrievalResult]]] = {
ft: ([], []) for ft in fact_types
}
for r in results:
row = dict(r)
ft = row.get("fact_type")
row.pop("source", None)
if ft in result_dict:
result_dict[ft][0].append(RetrievalResult.from_db_row(row))
return result_dict
query_tsquery = " | ".join(tokens)
# Combined CTE query for both semantic and BM25 across all fact types
# Uses window functions to limit per fact_type per method
results = await conn.fetch(
f"""
WITH semantic_ranked AS (
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
1 - (embedding <=> $1::vector) AS similarity,
NULL::float AS bm25_score,
'semantic' AS source,
ROW_NUMBER() OVER (PARTITION BY fact_type ORDER BY embedding <=> $1::vector) AS rn
FROM {fq_table("memory_units")}
WHERE bank_id = $2
AND embedding IS NOT NULL
AND fact_type = ANY($3)
AND (1 - (embedding <=> $1::vector)) >= 0.3
),
bm25_ranked AS (
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
NULL::float AS similarity,
ts_rank_cd(search_vector, to_tsquery('english', $5)) AS bm25_score,
'bm25' AS source,
ROW_NUMBER() OVER (PARTITION BY fact_type ORDER BY ts_rank_cd(search_vector, to_tsquery('english', $5)) DESC) AS rn
FROM {fq_table("memory_units")}
WHERE bank_id = $2
AND fact_type = ANY($3)
AND search_vector @@ to_tsquery('english', $5)
),
semantic AS (
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
similarity, bm25_score, source
FROM semantic_ranked WHERE rn <= $4
),
bm25 AS (
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
similarity, bm25_score, source
FROM bm25_ranked WHERE rn <= $4
)
SELECT * FROM semantic
UNION ALL
SELECT * FROM bm25
""",
query_emb_str,
bank_id,
fact_types,
limit,
query_tsquery,
)
# Group results by fact_type and source
result_dict: dict[str, tuple[list[RetrievalResult], list[RetrievalResult]]] = {ft: ([], []) for ft in fact_types}
for r in results:
row = dict(r)
source = row.pop("source", None)
ft = row.get("fact_type")
if ft in result_dict:
if source == "semantic":
result_dict[ft][0].append(RetrievalResult.from_db_row(row))
else:
result_dict[ft][1].append(RetrievalResult.from_db_row(row))
return result_dict
async def retrieve_temporal_combined(
conn,
query_emb_str: str,
bank_id: str,
fact_types: list[str],
start_date: datetime,
end_date: datetime,
budget: int,
semantic_threshold: float = 0.1,
) -> dict[str, list[RetrievalResult]]:
"""
Temporal retrieval for multiple fact types in a single query.
Batches the entry point query using window functions to get top-N per fact type,
then runs spreading for each fact type.
Args:
conn: Database connection
query_emb_str: Query embedding as string
bank_id: Bank ID
fact_types: List of fact types to retrieve
start_date: Start of time range
end_date: End of time range
budget: Node budget for spreading per fact type
semantic_threshold: Minimum semantic similarity to include
Returns:
Dict mapping fact_type -> list of RetrievalResult
"""
from ..memory_engine import fq_table
# Ensure dates are timezone-aware
if start_date.tzinfo is None:
start_date = start_date.replace(tzinfo=UTC)
if end_date.tzinfo is None:
end_date = end_date.replace(tzinfo=UTC)
# Batch query: Get entry points for ALL fact types at once with window function
entry_points = await conn.fetch(
f"""
WITH ranked_entries AS (
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
1 - (embedding <=> $1::vector) AS similarity,
ROW_NUMBER() OVER (PARTITION BY fact_type ORDER BY COALESCE(occurred_start, mentioned_at, occurred_end) DESC, embedding <=> $1::vector) AS rn
FROM {fq_table("memory_units")}
WHERE bank_id = $2
AND fact_type = ANY($3)
AND embedding IS NOT NULL
AND (
(occurred_start IS NOT NULL AND occurred_end IS NOT NULL
AND occurred_start <= $5 AND occurred_end >= $4)
OR
(mentioned_at IS NOT NULL AND mentioned_at BETWEEN $4 AND $5)
OR
(occurred_start IS NOT NULL AND occurred_start BETWEEN $4 AND $5)
OR
(occurred_end IS NOT NULL AND occurred_end BETWEEN $4 AND $5)
)
AND (1 - (embedding <=> $1::vector)) >= $6
)
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id, similarity
FROM ranked_entries
WHERE rn <= 10
""",
query_emb_str,
bank_id,
fact_types,
start_date,
end_date,
semantic_threshold,
)
if not entry_points:
return {ft: [] for ft in fact_types}
# Group entry points by fact type
entries_by_ft: dict[str, list] = {ft: [] for ft in fact_types}
for ep in entry_points:
ft = ep["fact_type"]
if ft in entries_by_ft:
entries_by_ft[ft].append(ep)
# Calculate shared temporal parameters
total_days = (end_date - start_date).total_seconds() / 86400
mid_date = start_date + (end_date - start_date) / 2
# Process each fact type (spreading needs to stay per fact type due to link filtering)
results_by_ft: dict[str, list[RetrievalResult]] = {}
for ft in fact_types:
ft_entry_points = entries_by_ft.get(ft, [])
if not ft_entry_points:
results_by_ft[ft] = []
continue
results = []
visited = set()
node_scores = {}
# Process entry points
for ep in ft_entry_points:
unit_id = str(ep["id"])
visited.add(unit_id)
# Calculate temporal proximity
best_date = None
if ep["occurred_start"] is not None and ep["occurred_end"] is not None:
best_date = ep["occurred_start"] + (ep["occurred_end"] - ep["occurred_start"]) / 2
elif ep["occurred_start"] is not None:
best_date = ep["occurred_start"]
elif ep["occurred_end"] is not None:
best_date = ep["occurred_end"]
elif ep["mentioned_at"] is not None:
best_date = ep["mentioned_at"]
if best_date:
days_from_mid = abs((best_date - mid_date).total_seconds() / 86400)
temporal_proximity = 1.0 - min(days_from_mid / (total_days / 2), 1.0) if total_days > 0 else 1.0
else:
temporal_proximity = 0.5
ep_result = RetrievalResult.from_db_row(dict(ep))
ep_result.temporal_score = temporal_proximity
ep_result.temporal_proximity = temporal_proximity
results.append(ep_result)
node_scores[unit_id] = (ep["similarity"], 1.0)
# Spreading through temporal links (same as single-fact-type version)
frontier = list(node_scores.keys())
budget_remaining = budget - len(ft_entry_points)
batch_size = 20
while frontier and budget_remaining > 0:
batch_ids = frontier[:batch_size]
frontier = frontier[batch_size:]
neighbors = await conn.fetch(
f"""
SELECT mu.id, mu.text, mu.context, mu.event_date, mu.occurred_start, mu.occurred_end, mu.mentioned_at, mu.access_count, mu.embedding, mu.fact_type, mu.document_id, mu.chunk_id,
ml.weight, ml.link_type, ml.from_unit_id,
1 - (mu.embedding <=> $1::vector) AS similarity
FROM {fq_table("memory_links")} ml
JOIN {fq_table("memory_units")} mu ON ml.to_unit_id = mu.id
WHERE ml.from_unit_id = ANY($2::uuid[])
AND ml.link_type IN ('temporal', 'causes', 'caused_by', 'enables', 'prevents')
AND ml.weight >= 0.1
AND mu.fact_type = $3
AND mu.embedding IS NOT NULL
AND (1 - (mu.embedding <=> $1::vector)) >= $4
ORDER BY ml.weight DESC
LIMIT $5
""",
query_emb_str,
batch_ids,
ft,
semantic_threshold,
batch_size * 10,
)
for n in neighbors:
neighbor_id = str(n["id"])
if neighbor_id in visited:
continue
visited.add(neighbor_id)
budget_remaining -= 1
parent_id = str(n["from_unit_id"])
_, parent_temporal_score = node_scores.get(parent_id, (0.5, 0.5))
neighbor_best_date = None
if n["occurred_start"] is not None and n["occurred_end"] is not None:
neighbor_best_date = n["occurred_start"] + (n["occurred_end"] - n["occurred_start"]) / 2
elif n["occurred_start"] is not None:
neighbor_best_date = n["occurred_start"]
elif n["occurred_end"] is not None:
neighbor_best_date = n["occurred_end"]
elif n["mentioned_at"] is not None:
neighbor_best_date = n["mentioned_at"]
if neighbor_best_date:
days_from_mid = abs((neighbor_best_date - mid_date).total_seconds() / 86400)
neighbor_temporal_proximity = (
1.0 - min(days_from_mid / (total_days / 2), 1.0) if total_days > 0 else 1.0
)
else:
neighbor_temporal_proximity = 0.3
link_type = n["link_type"]
if link_type in ("causes", "caused_by"):
causal_boost = 2.0
elif link_type in ("enables", "prevents"):
causal_boost = 1.5
else:
causal_boost = 1.0
propagated_temporal = parent_temporal_score * n["weight"] * causal_boost * 0.7
combined_temporal = max(neighbor_temporal_proximity, propagated_temporal)
neighbor_result = RetrievalResult.from_db_row(dict(n))
neighbor_result.temporal_score = combined_temporal
neighbor_result.temporal_proximity = neighbor_temporal_proximity
results.append(neighbor_result)
if budget_remaining > 0 and combined_temporal > 0.2:
node_scores[neighbor_id] = (n["similarity"], combined_temporal)
frontier.append(neighbor_id)
if budget_remaining <= 0:
break
results_by_ft[ft] = results
return results_by_ft
async def retrieve_temporal(
conn,
query_emb_str: str,
bank_id: str,
fact_type: str,
start_date: datetime,
end_date: datetime,
budget: int,
semantic_threshold: float = 0.1,
) -> list[RetrievalResult]:
"""
Temporal retrieval with spreading activation.
Strategy:
1. Find entry points (facts in date range with semantic relevance)
2. Spread through temporal links to related facts
3. Score by temporal proximity + semantic similarity + link weight
Args:
conn: Database connection
query_emb_str: Query embedding as string
agent_id: bank ID
fact_type: Fact type to filter
start_date: Start of time range
end_date: End of time range
budget: Node budget for spreading
semantic_threshold: Minimum semantic similarity to include
Returns:
List of RetrievalResult objects with temporal scores
"""
# Ensure start_date and end_date are timezone-aware (UTC) to match database datetimes
if start_date.tzinfo is None:
start_date = start_date.replace(tzinfo=UTC)
if end_date.tzinfo is None:
end_date = end_date.replace(tzinfo=UTC)
entry_points = await conn.fetch(
f"""
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at, access_count, embedding, fact_type, document_id, chunk_id,
1 - (embedding <=> $1::vector) AS similarity
FROM {fq_table("memory_units")}
WHERE bank_id = $2
AND fact_type = $3
AND embedding IS NOT NULL
AND (
-- Match if occurred range overlaps with query range
(occurred_start IS NOT NULL AND occurred_end IS NOT NULL
AND occurred_start <= $5 AND occurred_end >= $4)
OR
-- Match if mentioned_at falls within query range
(mentioned_at IS NOT NULL AND mentioned_at BETWEEN $4 AND $5)
OR
-- Match if any occurred date is set and overlaps (even if only start or end is set)
(occurred_start IS NOT NULL AND occurred_start BETWEEN $4 AND $5)
OR
(occurred_end IS NOT NULL AND occurred_end BETWEEN $4 AND $5)
)
AND (1 - (embedding <=> $1::vector)) >= $6
ORDER BY COALESCE(occurred_start, mentioned_at, occurred_end) DESC, (embedding <=> $1::vector) ASC
LIMIT 10
""",
query_emb_str,
bank_id,
fact_type,
start_date,
end_date,
semantic_threshold,
)
if not entry_points:
return []
# Calculate temporal scores for entry points
total_days = (end_date - start_date).total_seconds() / 86400
mid_date = start_date + (end_date - start_date) / 2 # Calculate once for all comparisons
results = []
visited = set()
for ep in entry_points:
unit_id = str(ep["id"])
visited.add(unit_id)
# Calculate temporal proximity using the most relevant date
# Priority: occurred_start/end (event time) > mentioned_at (mention time)
best_date = None
if ep["occurred_start"] is not None and ep["occurred_end"] is not None:
# Use midpoint of occurred range
best_date = ep["occurred_start"] + (ep["occurred_end"] - ep["occurred_start"]) / 2
elif ep["occurred_start"] is not None:
best_date = ep["occurred_start"]
elif ep["occurred_end"] is not None:
best_date = ep["occurred_end"]
elif ep["mentioned_at"] is not None:
best_date = ep["mentioned_at"]
# Temporal proximity score (closer to range center = higher score)
if best_date:
days_from_mid = abs((best_date - mid_date).total_seconds() / 86400)
temporal_proximity = 1.0 - min(days_from_mid / (total_days / 2), 1.0) if total_days > 0 else 1.0
else:
temporal_proximity = 0.5 # Fallback if no dates (shouldn't happen due to WHERE clause)
# Create RetrievalResult with temporal scores
ep_result = RetrievalResult.from_db_row(dict(ep))
ep_result.temporal_score = temporal_proximity
ep_result.temporal_proximity = temporal_proximity
results.append(ep_result)
# Spread through temporal links using BATCHED neighbor fetching
# Map node_id -> (semantic_sim, temporal_score) for propagation
node_scores = {str(ep["id"]): (ep["similarity"], 1.0) for ep in entry_points}
frontier = list(node_scores.keys()) # Current batch of nodes to expand
budget_remaining = budget - len(entry_points)
batch_size = 20 # Process this many nodes per DB query
while frontier and budget_remaining > 0:
# Take a batch from frontier
batch_ids = frontier[:batch_size]
frontier = frontier[batch_size:]
# Batch fetch all neighbors for this batch of nodes
neighbors = await conn.fetch(
f"""
SELECT mu.id, mu.text, mu.context, mu.event_date, mu.occurred_start, mu.occurred_end, mu.mentioned_at, mu.access_count, mu.embedding, mu.fact_type, mu.document_id, mu.chunk_id,
ml.weight, ml.link_type, ml.from_unit_id,
1 - (mu.embedding <=> $1::vector) AS similarity
FROM {fq_table("memory_links")} ml
JOIN {fq_table("memory_units")} mu ON ml.to_unit_id = mu.id
WHERE ml.from_unit_id = ANY($2::uuid[])
AND ml.link_type IN ('temporal', 'causes', 'caused_by', 'enables', 'prevents')
AND ml.weight >= 0.1
AND mu.fact_type = $3
AND mu.embedding IS NOT NULL
AND (1 - (mu.embedding <=> $1::vector)) >= $4
ORDER BY ml.weight DESC
LIMIT $5
""",
query_emb_str,
batch_ids,
fact_type,
semantic_threshold,
batch_size * 10, # Allow up to 10 neighbors per node in batch
)
for n in neighbors:
neighbor_id = str(n["id"])
if neighbor_id in visited:
continue
visited.add(neighbor_id)
budget_remaining -= 1
# Get parent's scores for propagation
parent_id = str(n["from_unit_id"])
_, parent_temporal_score = node_scores.get(parent_id, (0.5, 0.5))
# Calculate temporal score for neighbor using best available date
neighbor_best_date = None
if n["occurred_start"] is not None and n["occurred_end"] is not None:
neighbor_best_date = n["occurred_start"] + (n["occurred_end"] - n["occurred_start"]) / 2
elif n["occurred_start"] is not None:
neighbor_best_date = n["occurred_start"]
elif n["occurred_end"] is not None:
neighbor_best_date = n["occurred_end"]
elif n["mentioned_at"] is not None:
neighbor_best_date = n["mentioned_at"]
if neighbor_best_date:
days_from_mid = abs((neighbor_best_date - mid_date).total_seconds() / 86400)
neighbor_temporal_proximity = (
1.0 - min(days_from_mid / (total_days / 2), 1.0) if total_days > 0 else 1.0
)
else:
neighbor_temporal_proximity = 0.3 # Lower score if no temporal data
# Boost causal links (same as graph retrieval)
link_type = n["link_type"]
if link_type in ("causes", "caused_by"):
causal_boost = 2.0
elif link_type in ("enables", "prevents"):
causal_boost = 1.5
else:
causal_boost = 1.0
# Propagate temporal score through links (decay, with causal boost)
propagated_temporal = parent_temporal_score * n["weight"] * causal_boost * 0.7
# Combined temporal score
combined_temporal = max(neighbor_temporal_proximity, propagated_temporal)
# Create RetrievalResult with temporal scores
neighbor_result = RetrievalResult.from_db_row(dict(n))
neighbor_result.temporal_score = combined_temporal
neighbor_result.temporal_proximity = neighbor_temporal_proximity
results.append(neighbor_result)
# Track scores for propagation and add to frontier
if budget_remaining > 0 and combined_temporal > 0.2:
node_scores[neighbor_id] = (n["similarity"], combined_temporal)
frontier.append(neighbor_id)
if budget_remaining <= 0:
break
return results
async def retrieve_parallel(
pool,
query_text: str,
query_embedding_str: str,
bank_id: str,
fact_type: str,
thinking_budget: int,
question_date: datetime | None = None,
query_analyzer: Optional["QueryAnalyzer"] = None,
graph_retriever: GraphRetriever | None = None,
temporal_constraint: tuple | None = None, # Pre-extracted temporal constraint
) -> ParallelRetrievalResult:
"""
Run 3-way or 4-way parallel retrieval (adds temporal if detected).
Args:
pool: Database connection pool
query_text: Query text
query_embedding_str: Query embedding as string
bank_id: Bank ID
fact_type: Fact type to filter
thinking_budget: Budget for graph traversal and retrieval limits
question_date: Optional date when question was asked (for temporal filtering)
query_analyzer: Query analyzer to use (defaults to TransformerQueryAnalyzer)
graph_retriever: Graph retrieval strategy (defaults to configured retriever)
temporal_constraint: Pre-extracted temporal constraint (optional)
Returns:
ParallelRetrievalResult with semantic, bm25, graph, temporal results and timings
"""
retriever = graph_retriever or get_default_graph_retriever()
# Use optimized parallel path for MPFP and LinkExpansion (runs all methods truly in parallel)
# BFS uses legacy path that extracts temporal constraint upfront
if retriever.name in ("mpfp", "link_expansion"):
return await _retrieve_parallel_mpfp(
pool,
query_text,
query_embedding_str,
bank_id,
fact_type,
thinking_budget,
temporal_constraint,
retriever,
question_date,
query_analyzer,
)
else:
# For BFS, extract temporal constraint upfront (legacy path)
if temporal_constraint is None:
from .temporal_extraction import extract_temporal_constraint
temporal_constraint = extract_temporal_constraint(
query_text, reference_date=question_date, analyzer=query_analyzer
)
return await _retrieve_parallel_bfs(
pool, query_text, query_embedding_str, bank_id, fact_type, thinking_budget, temporal_constraint, retriever
)
@dataclass
class _TimedResult:
"""Internal result with timing."""
results: list[RetrievalResult]
time: float
conn_wait: float = 0.0 # Connection acquisition wait time
async def _retrieve_parallel_mpfp(
pool,
query_text: str,
query_embedding_str: str,
bank_id: str,
fact_type: str,
thinking_budget: int,
temporal_constraint: tuple | None,
retriever: GraphRetriever,
question_date: datetime | None = None,
query_analyzer=None,
) -> ParallelRetrievalResult:
"""
MPFP retrieval with true parallelization.
All methods run independently in parallel:
- Semantic: vector similarity search
- BM25: keyword search
- Graph: MPFP traversal (does its own semantic seeds internally)
- Temporal: date extraction (if needed) + date-range search
Temporal extraction runs IN PARALLEL with other retrievals, so even if
dateparser is slow, it doesn't block semantic/BM25/graph.
"""
import time
async def run_semantic() -> _TimedResult:
"""Independent semantic retrieval."""
start = time.time()
acquire_start = time.time()
async with acquire_with_retry(pool) as conn:
conn_wait = time.time() - acquire_start
results = await retrieve_semantic(conn, query_embedding_str, bank_id, fact_type, limit=thinking_budget)
return _TimedResult(results, time.time() - start, conn_wait)
async def run_bm25() -> _TimedResult:
"""Independent BM25 retrieval."""
start = time.time()
acquire_start = time.time()
async with acquire_with_retry(pool) as conn:
conn_wait = time.time() - acquire_start
results = await retrieve_bm25(conn, query_text, bank_id, fact_type, limit=thinking_budget)
return _TimedResult(results, time.time() - start, conn_wait)
async def run_graph() -> tuple[list[RetrievalResult], float, MPFPTimings | None]:
"""Independent graph retrieval - does its own semantic seeds."""
start = time.time()
# MPFP does its own semantic seeds via _find_semantic_seeds
# Note: temporal_seeds not used here to avoid dependency on temporal extraction
results, mpfp_timing = await retriever.retrieve(
pool=pool,
query_embedding_str=query_embedding_str,
bank_id=bank_id,
fact_type=fact_type,
budget=thinking_budget,
query_text=query_text,
semantic_seeds=None, # Let MPFP find its own seeds
temporal_seeds=None, # Don't wait for temporal extraction
)
return results, time.time() - start, mpfp_timing
@dataclass
class _TemporalWithConstraint:
"""Temporal results with the extracted constraint."""
results: list[RetrievalResult]
time: float
constraint: tuple | None
extraction_time: float # Time spent in query analyzer (dateparser)
conn_wait: float = 0.0 # Connection acquisition wait time
async def run_temporal_with_extraction() -> _TemporalWithConstraint:
"""
Extract temporal constraint AND run temporal retrieval.
This runs in parallel with semantic/BM25/graph, so dateparser
latency doesn't block other retrievals.
"""
start = time.time()
# Use pre-provided constraint if available
tc = temporal_constraint
extraction_time = 0.0
# Otherwise extract from query (this is the potentially slow dateparser call)
if tc is None:
from .temporal_extraction import extract_temporal_constraint
extraction_start = time.time()
tc = extract_temporal_constraint(query_text, reference_date=question_date, analyzer=query_analyzer)
extraction_time = time.time() - extraction_start
# If no temporal constraint found, return empty (but still report extraction time)
if tc is None:
return _TemporalWithConstraint([], time.time() - start, None, extraction_time, 0.0)
# Run temporal retrieval with the extracted constraint
tc_start, tc_end = tc
acquire_start = time.time()
async with acquire_with_retry(pool) as conn:
conn_wait = time.time() - acquire_start
results = await retrieve_temporal(
conn,
query_embedding_str,
bank_id,
fact_type,
tc_start,
tc_end,
budget=thinking_budget,
semantic_threshold=0.1,
)
return _TemporalWithConstraint(results, time.time() - start, tc, extraction_time, conn_wait)
# Run ALL methods in parallel (including temporal extraction!)
semantic_result, bm25_result, graph_result, temporal_result = await asyncio.gather(
run_semantic(),
run_bm25(),
run_graph(),
run_temporal_with_extraction(),
)
graph_results, graph_time, mpfp_timing = graph_result
# Compute max connection wait across all methods (graph handles its own connections)
max_conn_wait = max(semantic_result.conn_wait, bm25_result.conn_wait, temporal_result.conn_wait)
return ParallelRetrievalResult(
semantic=semantic_result.results,
bm25=bm25_result.results,
graph=graph_results,
temporal=temporal_result.results if temporal_result.results else None,
timings={
"semantic": semantic_result.time,
"bm25": bm25_result.time,
"graph": graph_time,
"temporal": temporal_result.time,
"temporal_extraction": temporal_result.extraction_time,
},
temporal_constraint=temporal_result.constraint,
mpfp_timings=[mpfp_timing] if mpfp_timing else [],
max_conn_wait=max_conn_wait,
)
async def _get_temporal_entry_points(
conn,
query_embedding_str: str,
bank_id: str,
fact_type: str,
start_date: datetime,
end_date: datetime,
limit: int = 20,
semantic_threshold: float = 0.1,
) -> list[RetrievalResult]:
"""Get temporal entry points (facts in date range with semantic relevance)."""
if start_date.tzinfo is None:
start_date = start_date.replace(tzinfo=UTC)
if end_date.tzinfo is None:
end_date = end_date.replace(tzinfo=UTC)
rows = await conn.fetch(
f"""
SELECT id, text, context, event_date, occurred_start, occurred_end, mentioned_at,
access_count, embedding, fact_type, document_id, chunk_id,
1 - (embedding <=> $1::vector) AS similarity
FROM {fq_table("memory_units")}
WHERE bank_id = $2
AND fact_type = $3
AND embedding IS NOT NULL
AND (
(occurred_start IS NOT NULL AND occurred_end IS NOT NULL
AND occurred_start <= $5 AND occurred_end >= $4)
OR (mentioned_at IS NOT NULL AND mentioned_at BETWEEN $4 AND $5)
OR (occurred_start IS NOT NULL AND occurred_start BETWEEN $4 AND $5)
OR (occurred_end IS NOT NULL AND occurred_end BETWEEN $4 AND $5)
)
AND (1 - (embedding <=> $1::vector)) >= $6
ORDER BY COALESCE(occurred_start, mentioned_at, occurred_end) DESC,
(embedding <=> $1::vector) ASC
LIMIT $7
""",
query_embedding_str,
bank_id,
fact_type,
start_date,
end_date,
semantic_threshold,
limit,
)
results = []
total_days = max((end_date - start_date).total_seconds() / 86400, 1)
mid_date = start_date + (end_date - start_date) / 2
for row in rows:
result = RetrievalResult.from_db_row(dict(row))
# Calculate temporal proximity score
best_date = None
if row["occurred_start"] and row["occurred_end"]:
best_date = row["occurred_start"] + (row["occurred_end"] - row["occurred_start"]) / 2
elif row["occurred_start"]:
best_date = row["occurred_start"]
elif row["occurred_end"]:
best_date = row["occurred_end"]
elif row["mentioned_at"]:
best_date = row["mentioned_at"]
if best_date:
days_from_mid = abs((best_date - mid_date).total_seconds() / 86400)
result.temporal_proximity = 1.0 - min(days_from_mid / (total_days / 2), 1.0)
else:
result.temporal_proximity = 0.5
result.temporal_score = result.temporal_proximity
results.append(result)
return results
async def _retrieve_parallel_bfs(
pool,
query_text: str,
query_embedding_str: str,
bank_id: str,
fact_type: str,
thinking_budget: int,
temporal_constraint: tuple | None,
retriever: GraphRetriever,
) -> ParallelRetrievalResult:
"""BFS retrieval: all methods run in parallel (original behavior)."""
import time
async def run_semantic() -> _TimedResult:
start = time.time()
async with acquire_with_retry(pool) as conn:
results = await retrieve_semantic(conn, query_embedding_str, bank_id, fact_type, limit=thinking_budget)
return _TimedResult(results, time.time() - start)
async def run_bm25() -> _TimedResult:
start = time.time()
async with acquire_with_retry(pool) as conn:
results = await retrieve_bm25(conn, query_text, bank_id, fact_type, limit=thinking_budget)
return _TimedResult(results, time.time() - start)
async def run_graph() -> _TimedResult:
start = time.time()
results, _ = await retriever.retrieve(
pool=pool,
query_embedding_str=query_embedding_str,
bank_id=bank_id,
fact_type=fact_type,
budget=thinking_budget,
query_text=query_text,
)
return _TimedResult(results, time.time() - start)
async def run_temporal(tc_start, tc_end) -> _TimedResult:
start = time.time()
async with acquire_with_retry(pool) as conn:
results = await retrieve_temporal(
conn,
query_embedding_str,
bank_id,
fact_type,
tc_start,
tc_end,
budget=thinking_budget,
semantic_threshold=0.1,
)
return _TimedResult(results, time.time() - start)
if temporal_constraint:
tc_start, tc_end = temporal_constraint
semantic_r, bm25_r, graph_r, temporal_r = await asyncio.gather(
run_semantic(),
run_bm25(),
run_graph(),
run_temporal(tc_start, tc_end),
)
return ParallelRetrievalResult(
semantic=semantic_r.results,
bm25=bm25_r.results,
graph=graph_r.results,
temporal=temporal_r.results,
timings={
"semantic": semantic_r.time,
"bm25": bm25_r.time,
"graph": graph_r.time,
"temporal": temporal_r.time,
},
temporal_constraint=temporal_constraint,
)
else:
semantic_r, bm25_r, graph_r = await asyncio.gather(
run_semantic(),
run_bm25(),
run_graph(),
)
return ParallelRetrievalResult(
semantic=semantic_r.results,
bm25=bm25_r.results,
graph=graph_r.results,
temporal=None,
timings={
"semantic": semantic_r.time,
"bm25": bm25_r.time,
"graph": graph_r.time,
},
temporal_constraint=None,
)
async def retrieve_all_fact_types_parallel(
pool,
query_text: str,
query_embedding_str: str,
bank_id: str,
fact_types: list[str],
thinking_budget: int,
question_date: datetime | None = None,
query_analyzer: Optional["QueryAnalyzer"] = None,
graph_retriever: GraphRetriever | None = None,
) -> MultiFactTypeRetrievalResult:
"""
Optimized retrieval for multiple fact types using batched queries.
This reduces database round-trips by:
1. Combining semantic + BM25 into one CTE query for ALL fact types (1 query instead of 2N)
2. Running graph retrieval per fact type in parallel (N parallel tasks)
3. Running temporal retrieval per fact type in parallel (N parallel tasks)
Args:
pool: Database connection pool
query_text: Query text
query_embedding_str: Query embedding as string
bank_id: Bank ID
fact_types: List of fact types to retrieve
thinking_budget: Budget for graph traversal and retrieval limits
question_date: Optional date when question was asked (for temporal filtering)
query_analyzer: Query analyzer to use (defaults to TransformerQueryAnalyzer)
graph_retriever: Graph retrieval strategy (defaults to configured retriever)
Returns:
MultiFactTypeRetrievalResult with results organized by fact type
"""
import time
retriever = graph_retriever or get_default_graph_retriever()
start_time = time.time()
timings: dict[str, float] = {}
# Step 1: Extract temporal constraint first (CPU work, no DB)
# Do this before DB queries so we know if we need temporal retrieval
temporal_extraction_start = time.time()
from .temporal_extraction import extract_temporal_constraint
temporal_constraint = extract_temporal_constraint(query_text, reference_date=question_date, analyzer=query_analyzer)
temporal_extraction_time = time.time() - temporal_extraction_start
timings["temporal_extraction"] = temporal_extraction_time
# Step 2: Run semantic + BM25 + temporal combined in ONE connection!
# This reduces connection usage from 2 to 1 for these operations
semantic_bm25_start = time.time()
temporal_results_by_ft: dict[str, list[RetrievalResult]] = {}
temporal_time = 0.0
async with acquire_with_retry(pool) as conn:
conn_wait = time.time() - semantic_bm25_start
# Semantic + BM25 combined
semantic_bm25_results = await retrieve_semantic_bm25_combined(
conn, query_embedding_str, query_text, bank_id, fact_types, thinking_budget
)
semantic_bm25_time = time.time() - semantic_bm25_start
# Temporal combined (if constraint detected) - same connection!
if temporal_constraint:
tc_start, tc_end = temporal_constraint
temporal_start = time.time()
temporal_results_by_ft = await retrieve_temporal_combined(
conn,
query_embedding_str,
bank_id,
fact_types,
tc_start,
tc_end,
budget=thinking_budget,
semantic_threshold=0.1,
)
temporal_time = time.time() - temporal_start
timings["semantic_bm25_combined"] = semantic_bm25_time
timings["temporal_combined"] = temporal_time
# Step 3: Run graph retrieval for each fact type in parallel
async def run_graph_for_fact_type(ft: str) -> tuple[str, list[RetrievalResult], float, MPFPTimings | None]:
graph_start = time.time()
results, mpfp_timing = await retriever.retrieve(
pool=pool,
query_embedding_str=query_embedding_str,
bank_id=bank_id,
fact_type=ft,
budget=thinking_budget,
query_text=query_text,
semantic_seeds=None,
temporal_seeds=None,
)
return ft, results, time.time() - graph_start, mpfp_timing
# Run graph for all fact types in parallel
graph_tasks = [run_graph_for_fact_type(ft) for ft in fact_types]
graph_results_list = await asyncio.gather(*graph_tasks)
# Organize results by fact type
results_by_fact_type: dict[str, ParallelRetrievalResult] = {}
max_conn_wait = conn_wait # Single connection for semantic+bm25+temporal
all_mpfp_timings: list[MPFPTimings] = []
for ft in fact_types:
# Get semantic + bm25 results for this fact type
semantic_results, bm25_results = semantic_bm25_results.get(ft, ([], []))
# Find graph results for this fact type
graph_results = []
graph_time = 0.0
mpfp_timing = None
for gr in graph_results_list:
if gr[0] == ft:
graph_results = gr[1]
graph_time = gr[2]
mpfp_timing = gr[3]
if mpfp_timing:
all_mpfp_timings.append(mpfp_timing)
break
# Get temporal results for this fact type from combined result
temporal_results = temporal_results_by_ft.get(ft) if temporal_constraint else None
if temporal_results is not None and len(temporal_results) == 0:
temporal_results = None
results_by_fact_type[ft] = ParallelRetrievalResult(
semantic=semantic_results,
bm25=bm25_results,
graph=graph_results,
temporal=temporal_results,
timings={
"semantic": semantic_bm25_time / 2, # Approximate split
"bm25": semantic_bm25_time / 2,
"graph": graph_time,
"temporal": temporal_time, # Same for all fact types (single query)
"temporal_extraction": temporal_extraction_time,
},
temporal_constraint=temporal_constraint,
mpfp_timings=[mpfp_timing] if mpfp_timing else [],
max_conn_wait=max_conn_wait,
)
total_time = time.time() - start_time
timings["total"] = total_time
return MultiFactTypeRetrievalResult(
results_by_fact_type=results_by_fact_type,
timings=timings,
max_conn_wait=max_conn_wait,
)