Papers › Weakly supervised temporal action localization with actionness-guided false positive...
Weakly supervised temporal action localization with actionness-guided false positive suppression
Zhilin Li, Zilei Wang
Weakly supervised temporal action localization aims to locate the temporal boundaries of action instances in untrimmed videos using video-level labels and assign them the corresponding action category. Generally, it is solved by a pipeline called “localization-by-classification”, which finds the action instances by classifying video snippets. However, since this approach optimizes the video-level classification objective, the generated activation sequences often suffer interference from class-related scenes, resulting in a large number of false positives in the prediction results. Many existing works treat background as an independent category, forcing models to learn to distinguish background snippets. However, under weakly supervised conditions, the background information is fuzzy and uncertain, making this method extremely difficult. To alleviate the impact of false positives, we propose a new actionness-guided false positive suppression framework. Our method seeks to suppress false positive backgrounds without introducing the background category. Firstly, we propose a self-training actionness branch to learn class-agnostic actionness, which can minimize the interference of class-related scene information by ignoring the video labels. Secondly, we propose a false positive suppression module to mine false positive snippets and suppress them. Finally, we introduce the foreground enhancement module, which guides the model to learn the foreground with the help of the attention mechanism as well as class-agnostic actionness. We conduct extensive experiments on three benchmarks (THUMOS14, ActivityNet1.2, and ActivityNet1.3). The results demonstrate the effectiveness of our method in suppressing false positives and it achieves the state-of-the-art performance. Code: https://github.com/lizhilin-ustc/AFPS.
Code
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
Not run by Syntology. Nothing on this page verifies that the listed code works.
Tasks
Results from the paper archive 2025-07-28
| Task | Dataset | Model | Metric | Value | Rank at snapshot | Leaderboard | Report |
|---|---|---|---|---|---|---|---|
| Weakly Supervised Action Localization | ActivityNet-1.2 | AFPS | Mean mAP | 29.9 | #3 of 19 | Archive leaderboard | report |
| Weakly Supervised Action Localization | ActivityNet-1.2 | AFPS | mAP@0.5 | 48.6 | #3 of 19 | Archive leaderboard | report |
| Weakly Supervised Action Localization | ActivityNet-1.3 | AFPS | mAP@0.5 | 43.9 | #4 of 17 | Archive leaderboard | report |
| Weakly Supervised Action Localization | ActivityNet-1.3 | AFPS | mAP@0.5:0.95 | 27.3 | #4 of 17 | Archive leaderboard | report |
| Weakly Supervised Action Localization | THUMOS 2014 | AFPS | mAP@0.1:0.5 | 59.1 | #6 of 30 | Archive leaderboard | report |
| Weakly Supervised Action Localization | THUMOS 2014 | AFPS | mAP@0.1:0.7 | 48.5 | #6 of 30 | Archive leaderboard | report |
| Weakly Supervised Action Localization | THUMOS 2014 | AFPS | mAP@0.5 | 41.0 | #6 of 30 | 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.
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