Papers › Timeception for Complex Action Recognition
Timeception for Complex Action Recognition
Noureldien Hussein, Efstratios Gavves, Arnold W. M. Smeulders
This paper focuses on the temporal aspect for recognizing human activities in videos; an important visual cue that has long been undervalued. We revisit the conventional definition of activity and restrict it to Complex Action: a set of one-actions with a weak temporal pattern that serves a specific purpose. Related works use spatiotemporal 3D convolutions with fixed kernel size, too rigid to capture the varieties in temporal extents of complex actions, and too short for long-range temporal modeling. In contrast, we use multi-scale temporal convolutions, and we reduce the complexity of 3D convolutions. The outcome is Timeception convolution layers, which reasons about minute-long temporal patterns, a factor of 8 longer than best related works. As a result, Timeception achieves impressive accuracy in recognizing the human activities of Charades, Breakfast Actions, and MultiTHUMOS. Further, we demonstrate that Timeception learns long-range temporal dependencies and tolerate temporal extents of complex actions.
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Code
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Tasks
Results from the paper archive 2025-07-28
| Task | Dataset | Model | Metric | Value | Rank at snapshot | Leaderboard | Report |
|---|---|---|---|---|---|---|---|
| Action Classification | Charades | Timeception (R3D) | MAP | 41.1 | #30 of 49 | Archive leaderboard | report |
| Action Classification | Charades | Timeception (I3D) | MAP | 37.2 | #38 of 49 | Archive leaderboard | report |
| Action Classification | Charades | Timeception (R2D) | MAP | 31.6 | #41 of 49 | Archive leaderboard | report |
| Long-video Activity Recognition | Breakfast | Timeception (I3D-K400-Pretrain-feature) | mAP | 61.82 | #7 of 8 | Archive leaderboard | report |
| Video Classification | Breakfast | Timeception | Accuracy (%) | 71.3 | #8 of 9 | 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
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