fix(server): map GroundingDINO detections back onto the caller's labels

[krisztian-gajdar]

Summary

GroundingDINO's post-processor decodes, per box, the prompt tokens above text_threshold, so a caller's label comes back lowercased and possibly as a fragment or a span merged across two labels (leather handbag for Red Leather Handbag). A caller that matches detections against the labels it sent then finds none of them.

Each decoded phrase is now mapped back onto the caller's label it overlaps most: the share of the label's words the phrase contains first, then how many of the phrase's words the label explains (red handbag beats handbag for the phrase red handbag), with the earlier label breaking a full tie. The phrase is kept verbatim only when no label shares a word with it, which is the free-text instruction prompt case or a decode the caller never asked for. A caller sending Red Leather Handbag gets Red Leather Handbag back.

Verification

• packages/sie_server/tests/adapters/test_grounding_dino.py: 24 passed, two of them new (a multi-word caller label is preserved; an instruction prompt keeps the decoded phrase).
• ruff format --check and ruff check clean on both files.

Summary by CodeRabbit

• Bug Fixes

  • Improved object detection label matching for partial and multi-word phrases.
  • Detection results now more reliably preserve the labels provided in prompts, including labels with repeated words.
  • Unmatched phrases continue using decoded detection text.
  • Instruction-only prompts continue displaying decoded detection phrases when no matching label is found.

• Tests

  • Added coverage for multi-word label matching, repeated words, unmatched phrases, and instruction-based prompts.

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• packages/sie_server/src/sie_server/adapters/grounding_dino/adapter.py
• packages/sie_server/tests/adapters/test_grounding_dino.py

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• packages/sie_server/tests/adapters/test_grounding_dino.py
• packages/sie_server/src/sie_server/adapters/grounding_dino/adapter.py

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📝 Walkthrough

Walkthrough

GroundingDINO detections now map decoded phrases to caller-provided labels using regex tokenization and word-overlap scoring. Both detection paths pass labels through post-processing. Tests cover matching, duplicate words, punctuation, and fallback behavior.

Changes

GroundingDINO label mapping

Layer / File(s)	Summary
Canonical label matching packages/sie_server/src/sie_server/adapters/grounding_dino/adapter.py, packages/sie_server/tests/adapters/test_grounding_dino.py	_canonical_label tokenizes phrases and selects the caller label with the strongest deduplicated word coverage. Unmatched phrases and missing labels retain decoded text.
Detection pipeline mapping packages/sie_server/src/sie_server/adapters/grounding_dino/adapter.py, packages/sie_server/tests/adapters/test_grounding_dino.py	Both detection paths pass caller labels through _detect_batch and _results_to_objects. Post-processing applies canonical labels while instruction-only prompts retain decoded phrases. Tests cover fragmented and lowercased decoded phrases.

Sequence Diagram(s)

sequenceDiagram
  participant Caller
  participant _detect_batch
  participant _results_to_objects
  participant _canonical_label
  Caller->>_detect_batch: provide images and original labels
  _detect_batch->>_results_to_objects: pass decoded results and labels
  _results_to_objects->>_canonical_label: canonicalize decoded phrase
  _canonical_label-->>_results_to_objects: return matching label or decoded phrase
  _results_to_objects-->>Caller: return detection objects

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Suggested reviewers: dragosboca

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to aa5e0

Caller-provided labels are consistently retained in detection results, while unmatched free-text phrases continue to be returned unchanged. No actionable current-head risk remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 62.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: mapping GroundingDINO detections back to the caller’s labels.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/grounding-dino-caller-labels

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Actionable comments posted: 1

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Inline comments:
In `@packages/sie_server/src/sie_server/adapters/grounding_dino/adapter.py`:
- Around line 75-79: Update the label-word matching logic around
`_WORD_RE.findall` so repeated words in each label are counted only once when
computing `matched` and the score. Preserve the existing label iteration and
tie-breaking behavior, while ensuring duplicate tokens cannot inflate the match
count.

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Configuration used: Organization UI

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📒 Files selected for processing (2)

• packages/sie_server/src/sie_server/adapters/grounding_dino/adapter.py
• packages/sie_server/tests/adapters/test_grounding_dino.py

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