Files
Oleksandr Bezdieniezhnykh 88f6ae6dce [AZ-341] C2 FAISS HNSW retrieve wiring (FaissBridge + AZ-507 cut)
Shared retrieve_topk plumbing for every concrete C2 VprStrategy:
- FaissBridge centralises the c6 search_topk → VprResult pipeline,
  the defended-in-depth INV-4 check (exactly k, distance-ascending),
  the WARN-threshold check on distances[0], optional per-frame DEBUG
  log, and one `vpr.retrieve_topk` FDR record per call with latency
  measurement.
- DescriptorIndexCut Protocol — consumer-side structural cut of c6
  DescriptorIndex.search_topk (AZ-507); keeps c2_vpr c6-import-free.
- C2VprConfig gains warn_top1_threshold + debug_per_frame_distances
  knobs with validators.
- KNOWN_PAYLOAD_KEYS registers vpr.retrieve_topk for the FDR record
  schema with payload {frame_id, backbone_label, top10_distances,
  latency_us}; companion fixture added to the AZ-272 roundtrip suite.
- 22 unit tests cover AC-1..AC-11 + NFR-perf microbench (p95 ≤ 0.5 ms)
  + constructor and retrieve-argument validation.

Verdict: PASS_WITH_WARNINGS (2 Low findings — duplicated ISO-ts
helper across c2/c5/c11/c12, captured in AZ-508 hygiene PBI;
spec-listed but unused `normaliser` parameter dropped — INV-3 makes
the embedding L2-normalised at the strategy's `embed_query`).

Tests: 1565 passed / 80 skipped (was 1543; +22 new tests).
Co-authored-by: Cursor <cursoragent@cursor.com>
2026-05-13 21:45:40 +03:00

677 lines
24 KiB
Python

"""AZ-341 FaissBridge unit tests.
Covers AC-1..AC-11 + the NFR-perf microbench against the bridge using
fakes (no c6, c7, or live FAISS — c2_vpr stays AZ-507-clean).
"""
from __future__ import annotations
import logging
import time
from dataclasses import dataclass, field
from typing import TYPE_CHECKING
import numpy as np
import pytest
from gps_denied_onboard._types.vpr import VprQuery
from gps_denied_onboard.components.c2_vpr._faiss_bridge import FaissBridge
from gps_denied_onboard.components.c2_vpr.errors import IndexUnavailableError
from gps_denied_onboard.fdr_client import FdrClient
from gps_denied_onboard.fdr_client.records import (
CURRENT_SCHEMA_VERSION,
FdrRecord,
)
if TYPE_CHECKING:
from gps_denied_onboard.components.c2_vpr.descriptor_index_cut import (
TileIdTuple,
)
# ---------------------------------------------------------------------------
# Fakes
# ---------------------------------------------------------------------------
@dataclass
class _FakeDescriptorIndex:
"""Configurable :class:`DescriptorIndexCut` for the unit tests.
``results`` is the canned ``(tile_id_tuple, distance)`` list the
fake returns from :meth:`search_topk`; ``raises``, when set, is
raised instead. ``calls`` records every ``(query, k)`` invocation.
"""
results: list[tuple[tuple[int, float, float], float]] = field(default_factory=list)
raises: BaseException | None = None
calls: list[tuple[np.ndarray, int]] = field(default_factory=list)
def search_topk(
self, query: np.ndarray, k: int
) -> list[tuple[tuple[int, float, float], float]]:
self.calls.append((query, k))
if self.raises is not None:
raise self.raises
return list(self.results)
@dataclass
class _StubClock:
"""Deterministic Clock — ``monotonic_ns`` increments by ``step_ns``."""
next_monotonic_ns: int = 1_000_000_000
step_ns: int = 5_000
fixed_time_ns: int = 1_715_600_000_000_000_000
def monotonic_ns(self) -> int:
v = self.next_monotonic_ns
self.next_monotonic_ns += self.step_ns
return v
def time_ns(self) -> int:
return self.fixed_time_ns
def sleep_until_ns(self, target_ns: int) -> None:
_ = target_ns
def _make_fdr_client(*, force_overrun: bool = False) -> FdrClient:
client = FdrClient(
producer_id="c2_vpr",
capacity=8,
_emit_diag_log=False,
)
if force_overrun:
filler = FdrRecord(
schema_version=CURRENT_SCHEMA_VERSION,
ts="2026-05-13T00:00:00.000000+00:00",
producer_id=client.producer_id,
kind="log",
payload={
"level": "INFO",
"component": "test",
"frame_id": "",
"kind": "test",
"msg": "filler",
},
)
# `FdrClient._buffer` is the SPSC ring; its capacity is rounded
# up to the next power of two from the constructor argument.
# Filling to capacity makes the next enqueue return OVERRUN.
while client.enqueue(filler) == "ok":
pass
return client
def _make_query(*, frame_id: int = 4242, dim: int = 512) -> VprQuery:
embedding = np.zeros((dim,), dtype=np.float32)
embedding[0] = 1.0
return VprQuery(frame_id=frame_id, embedding=embedding, produced_at=999)
def _ten_canned_results(
distances: list[float] | None = None,
) -> list[tuple[tuple[int, float, float], float]]:
distances = distances if distances is not None else [
0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50,
]
return [
((18, 49.0 + i * 0.001, 36.0 + i * 0.001), d)
for i, d in enumerate(distances)
]
def _build_bridge(
*,
descriptor_index: _FakeDescriptorIndex,
fdr_client: FdrClient,
clock: _StubClock,
descriptor_dim: int = 512,
warn_top1_threshold: float = 0.30,
debug_log_per_frame_distances: bool = False,
logger_name: str = "c2.faiss_bridge.test",
) -> FaissBridge:
return FaissBridge(
descriptor_index=descriptor_index,
descriptor_dim=descriptor_dim,
warn_top1_threshold=warn_top1_threshold,
debug_log_per_frame_distances=debug_log_per_frame_distances,
fdr_client=fdr_client,
logger=logging.getLogger(logger_name),
clock=clock,
)
# ---------------------------------------------------------------------------
# AC-1: happy-path retrieve → VprResult + FDR record
# ---------------------------------------------------------------------------
def test_retrieve_happy_path_returns_vpr_result_and_emits_fdr(
caplog: pytest.LogCaptureFixture,
) -> None:
# Arrange
descriptor_index = _FakeDescriptorIndex(results=_ten_canned_results())
fdr_client = _make_fdr_client()
clock = _StubClock()
bridge = _build_bridge(
descriptor_index=descriptor_index, fdr_client=fdr_client, clock=clock
)
query = _make_query(frame_id=4242)
# Act
with caplog.at_level(logging.DEBUG, logger="c2.faiss_bridge.test"):
result = bridge.retrieve(query, k=10, backbone_label="ultra_vpr")
# Assert — c6 cut was called exactly once with the correct args
assert len(descriptor_index.calls) == 1
sent_query, sent_k = descriptor_index.calls[0]
assert sent_k == 10
assert sent_query is query.embedding
# Assert — VprResult shape
assert result.frame_id == 4242
assert result.backbone_label == "ultra_vpr"
assert len(result.candidates) == 10
candidate_distances = [c.descriptor_distance for c in result.candidates]
assert candidate_distances == sorted(candidate_distances)
assert candidate_distances[0] == pytest.approx(0.05)
assert all(c.descriptor_dim == 512 for c in result.candidates)
assert result.retrieved_at > 0
# Assert — exactly one FDR record
record = fdr_client.pop_one()
assert record is not None
assert record.kind == "vpr.retrieve_topk"
assert record.payload["frame_id"] == 4242
assert record.payload["backbone_label"] == "ultra_vpr"
assert record.payload["top10_distances"] == pytest.approx(
[0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50]
)
assert isinstance(record.payload["latency_us"], int)
assert record.payload["latency_us"] > 0
assert fdr_client.pop_one() is None
# ---------------------------------------------------------------------------
# AC-2: INV-4 violation — undersized result → IndexUnavailableError
# ---------------------------------------------------------------------------
def test_retrieve_undersized_corpus_raises_index_unavailable_error(
caplog: pytest.LogCaptureFixture,
) -> None:
# Arrange
descriptor_index = _FakeDescriptorIndex(
results=[((18, 49.0, 36.0), 0.05), ((18, 49.001, 36.001), 0.10)],
)
fdr_client = _make_fdr_client()
clock = _StubClock()
bridge = _build_bridge(
descriptor_index=descriptor_index, fdr_client=fdr_client, clock=clock
)
query = _make_query()
# Act + Assert
with caplog.at_level(logging.ERROR, logger="c2.faiss_bridge.test"):
with pytest.raises(IndexUnavailableError) as exc_info:
bridge.retrieve(query, k=10, backbone_label="ultra_vpr")
assert "corpus returned 2 candidates (expected 10)" in str(exc_info.value)
# Assert — ERROR log with the invariant_violation kind
err_records = [
r for r in caplog.records if getattr(r, "kind", None) == "c2.vpr.invariant_violation"
]
assert len(err_records) == 1
assert err_records[0].kv["reason"] == "undersized"
assert err_records[0].kv["returned_count"] == 2
assert err_records[0].kv["expected_k"] == 10
# Assert — no FDR record emitted (failure is the corpus, not retrieval)
assert fdr_client.pop_one() is None
# ---------------------------------------------------------------------------
# AC-3: INV-4 violation — unordered distances
# ---------------------------------------------------------------------------
def test_retrieve_unordered_distances_raises_index_unavailable_error(
caplog: pytest.LogCaptureFixture,
) -> None:
# Arrange — distances out of ascending order at idx 2
bad_distances = [0.05, 0.20, 0.10, 0.15, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50]
descriptor_index = _FakeDescriptorIndex(
results=_ten_canned_results(distances=bad_distances),
)
fdr_client = _make_fdr_client()
clock = _StubClock()
bridge = _build_bridge(
descriptor_index=descriptor_index, fdr_client=fdr_client, clock=clock
)
query = _make_query()
# Act + Assert
with caplog.at_level(logging.ERROR, logger="c2.faiss_bridge.test"):
with pytest.raises(IndexUnavailableError) as exc_info:
bridge.retrieve(query, k=10, backbone_label="ultra_vpr")
assert "unordered distances" in str(exc_info.value)
err_records = [
r for r in caplog.records if getattr(r, "kind", None) == "c2.vpr.invariant_violation"
]
assert len(err_records) == 1
assert err_records[0].kv["reason"] == "unordered"
assert fdr_client.pop_one() is None
# ---------------------------------------------------------------------------
# AC-4: c6 raises IndexUnavailableError → propagates UNCHANGED (no catch)
# ---------------------------------------------------------------------------
def test_retrieve_propagates_index_unavailable_error_unchanged() -> None:
# Arrange — the fake raises ON the search_topk call (mirroring c6's
# stale-handle / sidecar / dim-mismatch defence)
inner = IndexUnavailableError("stale handle")
descriptor_index = _FakeDescriptorIndex(raises=inner)
fdr_client = _make_fdr_client()
clock = _StubClock()
bridge = _build_bridge(
descriptor_index=descriptor_index, fdr_client=fdr_client, clock=clock
)
query = _make_query()
# Act + Assert — same exception, NOT wrapped
with pytest.raises(IndexUnavailableError) as exc_info:
bridge.retrieve(query, k=10, backbone_label="ultra_vpr")
assert exc_info.value is inner
assert str(exc_info.value) == "stale handle"
# Assert — no FDR record (retrieval never completed)
assert fdr_client.pop_one() is None
# ---------------------------------------------------------------------------
# AC-5: WARN-threshold trigger when distances[0] > threshold
# ---------------------------------------------------------------------------
def test_retrieve_emits_warn_log_when_top1_above_threshold(
caplog: pytest.LogCaptureFixture,
) -> None:
# Arrange
distances = [0.42, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85]
descriptor_index = _FakeDescriptorIndex(
results=_ten_canned_results(distances=distances),
)
fdr_client = _make_fdr_client()
clock = _StubClock()
bridge = _build_bridge(
descriptor_index=descriptor_index,
fdr_client=fdr_client,
clock=clock,
warn_top1_threshold=0.30,
)
query = _make_query()
# Act
with caplog.at_level(logging.WARNING, logger="c2.faiss_bridge.test"):
result = bridge.retrieve(query, k=10, backbone_label="ultra_vpr")
# Assert — VprResult still returned
assert len(result.candidates) == 10
# Assert — exactly ONE WARN log with the expected kind + structured kv
warn_records = [
r for r in caplog.records
if getattr(r, "kind", None) == "c2.vpr.top1_distance_above_threshold"
]
assert len(warn_records) == 1
kv = warn_records[0].kv
assert kv["distance"] == pytest.approx(0.42)
assert kv["threshold"] == pytest.approx(0.30)
assert kv["backbone_label"] == "ultra_vpr"
# ---------------------------------------------------------------------------
# AC-6: WARN-threshold NOT triggered when top-1 below threshold
# ---------------------------------------------------------------------------
def test_retrieve_does_not_emit_warn_when_top1_below_threshold(
caplog: pytest.LogCaptureFixture,
) -> None:
# Arrange
distances = [0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60]
descriptor_index = _FakeDescriptorIndex(
results=_ten_canned_results(distances=distances),
)
fdr_client = _make_fdr_client()
clock = _StubClock()
bridge = _build_bridge(
descriptor_index=descriptor_index,
fdr_client=fdr_client,
clock=clock,
warn_top1_threshold=0.30,
)
query = _make_query()
# Act
with caplog.at_level(logging.WARNING, logger="c2.faiss_bridge.test"):
bridge.retrieve(query, k=10, backbone_label="ultra_vpr")
# Assert — no WARN log
warn_records = [
r for r in caplog.records
if getattr(r, "kind", None) == "c2.vpr.top1_distance_above_threshold"
]
assert warn_records == []
# ---------------------------------------------------------------------------
# AC-7: DEBUG per-frame distances ON → DEBUG log emitted
# ---------------------------------------------------------------------------
def test_retrieve_emits_debug_log_when_per_frame_distances_on(
caplog: pytest.LogCaptureFixture,
) -> None:
# Arrange
descriptor_index = _FakeDescriptorIndex(results=_ten_canned_results())
fdr_client = _make_fdr_client()
clock = _StubClock()
bridge = _build_bridge(
descriptor_index=descriptor_index,
fdr_client=fdr_client,
clock=clock,
debug_log_per_frame_distances=True,
)
query = _make_query(frame_id=9999)
# Act
with caplog.at_level(logging.DEBUG, logger="c2.faiss_bridge.test"):
bridge.retrieve(query, k=10, backbone_label="net_vlad")
# Assert — exactly one DEBUG record
debug_records = [
r for r in caplog.records
if getattr(r, "kind", None) == "c2.vpr.frame_distances"
]
assert len(debug_records) == 1
kv = debug_records[0].kv
assert kv["frame_id"] == 9999
assert kv["top10_distances"] == pytest.approx(
[0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50]
)
# ---------------------------------------------------------------------------
# AC-8: DEBUG per-frame distances OFF (default) → no DEBUG log
# ---------------------------------------------------------------------------
def test_retrieve_does_not_emit_debug_log_when_per_frame_distances_off(
caplog: pytest.LogCaptureFixture,
) -> None:
# Arrange
descriptor_index = _FakeDescriptorIndex(results=_ten_canned_results())
fdr_client = _make_fdr_client()
clock = _StubClock()
bridge = _build_bridge(
descriptor_index=descriptor_index, fdr_client=fdr_client, clock=clock
)
query = _make_query()
# Act
with caplog.at_level(logging.DEBUG, logger="c2.faiss_bridge.test"):
bridge.retrieve(query, k=10, backbone_label="ultra_vpr")
# Assert
debug_records = [
r for r in caplog.records
if getattr(r, "kind", None) == "c2.vpr.frame_distances"
]
assert debug_records == []
# ---------------------------------------------------------------------------
# AC-9: FDR record carries {frame_id, backbone_label, top10_distances, latency_us > 0}
# ---------------------------------------------------------------------------
def test_retrieve_fdr_record_fields_are_populated_with_positive_latency() -> None:
# Arrange
descriptor_index = _FakeDescriptorIndex(results=_ten_canned_results())
fdr_client = _make_fdr_client()
clock = _StubClock(step_ns=7_000)
bridge = _build_bridge(
descriptor_index=descriptor_index, fdr_client=fdr_client, clock=clock
)
query = _make_query(frame_id=12345)
# Act
bridge.retrieve(query, k=10, backbone_label="ultra_vpr")
# Assert
record = fdr_client.pop_one()
assert record is not None
assert record.kind == "vpr.retrieve_topk"
payload = record.payload
assert set(payload.keys()) == {
"frame_id", "backbone_label", "top10_distances", "latency_us",
}
assert payload["frame_id"] == 12345
assert payload["backbone_label"] == "ultra_vpr"
assert payload["top10_distances"] == pytest.approx(
[0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50]
)
assert payload["latency_us"] > 0
# ---------------------------------------------------------------------------
# AC-10: every concrete `VprStrategy.retrieve_topk` body is one return statement
# ---------------------------------------------------------------------------
def test_every_concrete_strategy_retrieve_topk_body_is_one_return_statement() -> None:
# Arrange — discover every concrete `VprStrategy` subclass via AST
# inspection of `c2_vpr/*.py` modules whose filename matches a
# ``KNOWN_STRATEGIES`` member. Strategies that don't exist yet
# (AZ-337..AZ-340) trivially pass this check.
import ast
import pathlib
from gps_denied_onboard.components.c2_vpr.config import KNOWN_STRATEGIES
component_dir = pathlib.Path(__file__).resolve().parents[3] / (
"src/gps_denied_onboard/components/c2_vpr"
)
strategy_files = sorted(
p for p in component_dir.iterdir()
if p.is_file() and p.suffix == ".py" and p.stem in KNOWN_STRATEGIES
)
# If no strategy files exist yet, the check still passes — AC-10 is
# forward-looking; AZ-337/338/339/340 will be required to satisfy it
# when they ship.
for strategy_file in strategy_files:
tree = ast.parse(strategy_file.read_text(encoding="utf-8"))
# Find every class that defines a ``retrieve_topk`` method
for node in ast.walk(tree):
if not isinstance(node, ast.ClassDef):
continue
for member in node.body:
if not isinstance(member, (ast.FunctionDef, ast.AsyncFunctionDef)):
continue
if member.name != "retrieve_topk":
continue
# Drop optional docstring (Expr/Constant string) from
# the body before counting statements.
body = list(member.body)
if (
body
and isinstance(body[0], ast.Expr)
and isinstance(body[0].value, ast.Constant)
and isinstance(body[0].value.value, str)
):
body = body[1:]
# Assert
assert len(body) == 1, (
f"{strategy_file.name}::{node.name}.retrieve_topk "
f"must have exactly one statement after docstring; "
f"got {len(body)}"
)
assert isinstance(body[0], ast.Return), (
f"{strategy_file.name}::{node.name}.retrieve_topk "
f"single statement must be `return ...`; got "
f"{type(body[0]).__name__}"
)
# ---------------------------------------------------------------------------
# AC-11: per-strategy `descriptor_dim` carried through to candidates
# ---------------------------------------------------------------------------
def test_descriptor_dim_carried_through_to_each_candidate() -> None:
# Arrange — two bridges with different dims
descriptor_index = _FakeDescriptorIndex(results=_ten_canned_results())
fdr_client = _make_fdr_client()
clock = _StubClock()
bridge_ultra = _build_bridge(
descriptor_index=_FakeDescriptorIndex(results=_ten_canned_results()),
fdr_client=_make_fdr_client(),
clock=_StubClock(),
descriptor_dim=512,
)
bridge_netvlad = _build_bridge(
descriptor_index=_FakeDescriptorIndex(results=_ten_canned_results()),
fdr_client=_make_fdr_client(),
clock=_StubClock(),
descriptor_dim=4096,
)
# Act
ultra = bridge_ultra.retrieve(
_make_query(dim=512), k=10, backbone_label="ultra_vpr"
)
netvlad = bridge_netvlad.retrieve(
_make_query(dim=4096), k=10, backbone_label="net_vlad"
)
# Assert
assert all(c.descriptor_dim == 512 for c in ultra.candidates)
assert all(c.descriptor_dim == 4096 for c in netvlad.candidates)
# ---------------------------------------------------------------------------
# NFR-perf: bridge.retrieve overhead p95 ≤ 0.5 ms (excluding c6 time)
# ---------------------------------------------------------------------------
def test_bridge_retrieve_overhead_p95_under_500us() -> None:
# Arrange
descriptor_index = _FakeDescriptorIndex(results=_ten_canned_results())
fdr_client = _make_fdr_client()
# WallClock-equivalent fake — uses time.monotonic_ns so the
# measured latency is realistic, not stub-step driven.
@dataclass
class _WallStubClock:
fixed_time_ns: int = 1_715_600_000_000_000_000
def monotonic_ns(self) -> int:
return time.monotonic_ns()
def time_ns(self) -> int:
return self.fixed_time_ns
def sleep_until_ns(self, target_ns: int) -> None:
_ = target_ns
clock = _WallStubClock()
bridge = _build_bridge(
descriptor_index=descriptor_index, fdr_client=fdr_client, clock=clock
)
query = _make_query()
n = 1000
timings_ns: list[int] = []
# Act — measure outside the bridge so we capture wrapper + INV-4 +
# candidate construction + FDR enqueue + log emission overhead.
for _ in range(n):
# Drain the FDR queue so the next enqueue does not OVERRUN.
while fdr_client.pop_one() is not None:
pass
t0 = time.monotonic_ns()
bridge.retrieve(query, k=10, backbone_label="ultra_vpr")
t1 = time.monotonic_ns()
timings_ns.append(t1 - t0)
# Assert — p95 ≤ 500 µs
timings_ns.sort()
p95_us = timings_ns[int(n * 0.95)] / 1_000
assert p95_us <= 500.0, f"bridge.retrieve p95 = {p95_us:.1f}µs > 500.0µs"
# ---------------------------------------------------------------------------
# Constructor validation — descriptor_dim, threshold, debug flag types
# ---------------------------------------------------------------------------
@pytest.mark.parametrize(
"kwargs, match",
[
({"descriptor_dim": "512"}, "descriptor_dim must be a non-bool int"),
({"descriptor_dim": True}, "descriptor_dim must be a non-bool int"),
({"descriptor_dim": 0}, "descriptor_dim must be > 0"),
({"descriptor_dim": -1}, "descriptor_dim must be > 0"),
({"warn_top1_threshold": "0.5"}, "warn_top1_threshold must be a float"),
({"warn_top1_threshold": True}, "warn_top1_threshold must be a float"),
({"warn_top1_threshold": -0.01}, "warn_top1_threshold must be >= 0"),
({"debug_log_per_frame_distances": 1}, "debug_log_per_frame_distances must be a bool"),
],
)
def test_constructor_rejects_invalid_arguments(
kwargs: dict[str, object], match: str
) -> None:
base = {
"descriptor_index": _FakeDescriptorIndex(results=_ten_canned_results()),
"descriptor_dim": 512,
"warn_top1_threshold": 0.30,
"debug_log_per_frame_distances": False,
"fdr_client": _make_fdr_client(),
"logger": logging.getLogger("c2.faiss_bridge.test"),
"clock": _StubClock(),
}
base.update(kwargs)
expected_error: type[BaseException] = (
ValueError
if match.startswith(("descriptor_dim must be > 0", "warn_top1_threshold must be >= 0"))
else TypeError
)
with pytest.raises(expected_error, match=match):
FaissBridge(**base) # type: ignore[arg-type]
def test_retrieve_rejects_non_positive_k_and_empty_backbone_label() -> None:
# Arrange
bridge = _build_bridge(
descriptor_index=_FakeDescriptorIndex(results=_ten_canned_results()),
fdr_client=_make_fdr_client(),
clock=_StubClock(),
)
query = _make_query()
# Act + Assert
with pytest.raises(ValueError, match="k must be > 0"):
bridge.retrieve(query, k=0, backbone_label="ultra_vpr")
with pytest.raises(TypeError, match="k must be a non-bool int"):
bridge.retrieve(query, k=True, backbone_label="ultra_vpr") # type: ignore[arg-type]
with pytest.raises(ValueError, match="backbone_label must be a non-empty"):
bridge.retrieve(query, k=10, backbone_label="")