Papers › Query2Label: A Simple Transformer Way to Multi-Label Classification
Query2Label: A Simple Transformer Way to Multi-Label Classification
Shilong Liu, Lei Zhang, Xiao Yang, Hang Su, Jun Zhu
This paper presents a simple and effective approach to solving the multi-label classification problem. The proposed approach leverages Transformer decoders to query the existence of a class label. The use of Transformer is rooted in the need of extracting local discriminative features adaptively for different labels, which is a strongly desired property due to the existence of multiple objects in one image. The built-in cross-attention module in the Transformer decoder offers an effective way to use label embeddings as queries to probe and pool class-related features from a feature map computed by a vision backbone for subsequent binary classifications. Compared with prior works, the new framework is simple, using standard Transformers and vision backbones, and effective, consistently outperforming all previous works on five multi-label classification data sets, including MS-COCO, PASCAL VOC, NUS-WIDE, and Visual Genome. Particularly, we establish 91.3% mAP on MS-COCO. We hope its compact structure, simple implementation, and superior performance serve as a strong baseline for multi-label classification tasks and future studies. The code will be available soon at https://github.com/SlongLiu/query2labels.
In Syntology Open this paper in Syntology's Atlas, the map of the papers in Syntology's graph and their citations.
For agents, Syntology's MCP tool lists every function and class Syntology harvested from this paper and whether it ran (how to connect): get_harvested_code_for_paper(arxiv_id="2107.10834")
Code
Syntology Ran 2 of 2 code samples harvested from 1 repository linked to this paper; 0 have no recorded run. Of those that ran: 1 ran · honoured contract; 1 ran · fixture could not drive it.
By repository: official repository: 2 samples from 1 repository, 2 ran. The run record, sample by sample. “Ran” means executed on a synthesized input, not that the code is correct or reproduces the paper.
Repository list and official/mentioned flags are the archive's, frozen 2025-07-28. Reachability, where shown, is from one Syntology probe window (2026-09-16 to 2026-09-18); repositories not probed show nothing. GitHub stars are not tracked.
Code Syntology ran Syntology
2 samples harvested; 2 ran; 1 honoured the contract we drafted; 0 have no recorded run. Read from Syntology's graph 2026-09-24; that is when this build read the record, not when the samples ran.
Licence: 0 of the 2 samples are pointer only, meaning Syntology does not serve that copy's text. This page shows no code text for any sample; each one links to its file in the repository.
Harvested from SlongLiu/query2labels. “Ran” means the sample executed on a synthesized input. It does not mean the output is correct, and nothing here reproduces the paper's results. “Honoured” and “violated” refer to a contract Syntology drafted from the code itself; “our draft was wrong” and “fixture could not drive it” are failures of Syntology's instrument, not of the code.
Each sample ends with its code_sha256, Syntology's identity for that exact code. An agent fetches the stored sample with Syntology's MCP tool get_code(code_sha256="…") (how to connect); click an identity to copy that call.
Repository labels, per sample. official repository: The archive marks this repository official for the paper. named in the paper: The archive records that the paper mentions this repository; it is not marked official. community (archive-listed): In the archive's code links for this paper, not marked official and not recorded as mentioned in the paper. found in paper text by Syntology: Syntology found this repository in the paper's own text; whether it is the authors' implementation is not asserted. community: Not in the archive's code links for this paper; a community repository Syntology harvested. Samples from a repository marked official are listed first. Licence labels name the repository's licence as recorded at harvest. “Pointer only” means Syntology does not serve that copy's text, for one of four reasons: no licence file was found; the licence was not identified; the licence is recorded as permissive but that copy's record is not marked cleared; or the licence is outside the permissive list Syntology serves text under (MIT, Apache-2.0, BSD and similar). Some licences outside that list permit redistribution, such as WTFPL, and GPL-3.0 under its conditions; they are simply not on the list. Hover a licence label for the reason. File links open the file on GitHub at the default branch, which may have changed since the harvest.
6840401a1f3d4796 · report
5aa56052c6f9f021 · report
Tasks
Results from the paper archive 2025-07-28
| Task | Dataset | Model | Metric | Value | Rank at snapshot | Leaderboard | Report |
|---|---|---|---|---|---|---|---|
| Multi-Label Classification | MS-COCO | Q2L-CvT(ImageNet-21K pretraining, resolution 384) | mAP | 91.3 | #5 of 34 | Archive leaderboard | report |
| Multi-Label Classification | MS-COCO | Q2L-SwinL(ImageNet-21K pretraining, resolution 384) | mAP | 90.5 | #8 of 34 | Archive leaderboard | report |
| Multi-Label Classification | MS-COCO | Q2L-TResL(ImageNet-21K pretraining, resolution 640) | mAP | 90.3 | #9 of 34 | Archive leaderboard | report |
| Multi-Label Classification | MS-COCO | Q2L-R101(resolution 448) | mAP | 84.9 | #25 of 34 | Archive leaderboard | report |
| Multi-Label Classification | NUS-WIDE | Q2L-CvT(resolution 384, ImageNet-21K pretrained) | MAP | 70.1 | #1 of 9 | Archive leaderboard | report |
| Multi-Label Classification | NUS-WIDE | Q2L-TResL(resoluition 448) | MAP | 66.3 | #3 of 9 | Archive leaderboard | report |
| Multi-Label Classification | NUS-WIDE | Q2L-R101(resolution 448) | MAP | 65.0 | #5 of 9 | Archive leaderboard | report |
| Multi-Label Classification | PASCAL VOC 2007 | Q2L-CvT(ImageNet-21K pretrained, resolution 384) | mAP | 97.3 | #1 of 17 | Archive leaderboard | report |
| Multi-Label Classification | PASCAL VOC 2007 | Q2L-TResL(ImageNet-21K pretrained, resolution 448) | mAP | 96.9 | #2 of 17 | Archive leaderboard | report |
| Multi-Label Classification | PASCAL VOC 2007 | Q2L-TResL(resolution 448) | mAP | 96.1 | #6 of 17 | Archive leaderboard | report |
| Multi-Label Classification | PASCAL VOC 2012 | Q2L-TResL(448 resolution) | mAP | 96.2 | #1 of 3 | Archive leaderboard | report |
Ranks are positions in the archive's leaderboards as they stood at the 2025-07-28 snapshot. Results published since then are not among these rows, so a rank here is not a current standing.
Methods
Report a problem or propose a change · a person checks every report against the paper or source before anything changes; decisions are listed on /corrections