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Research map / Vision-language and multimodal / CLIP and zero-shot

Cross-Modal Representation Learning for Zero-Shot Action Recognition

CVPR 2022 · Vision-language and multimodal › CLIP and zero-shot · approach: Attribute-based zero-shot learning · 0 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
jointly train visual classification and masked language modeling, then transfer semantic relatedness into visual prototypes (ablation)ResT · UCF101 0/50top-1 accuracy (%): 48.9 -> 54.7Helped
add masked language modeling to the classification task (ablation)ResT · UCF101 0/50top-1 accuracy (%): 47.4 -> 48.9Helped
use cross-modal attention in the classification task instead of visual-only attention (ablation)ResT · UCF101 0/50top-1 accuracy (%): 54.7 -> 39.0Hurt
replace the Transformer with an RNN (ablation)ResT · UCF101 0/50top-1 accuracy (%): 54.7 -> 28.2Hurt
replace the Transformer with an LSTM (ablation)ResT · UCF101 0/50top-1 accuracy (%): 54.7 -> 29.7Hurt
use R(2+1)D as the feature encoder instead of a 2D backbone (ablation)ResT · UCF101 0/50top-1 accuracy (%): 52.5 -> 59.5Helped
reduce inference from 25 clips to 1 clip (ablation)ResT 18 · UCF101 0/50top-1 accuracy (%): 54.7 -> 54.0No clear effect
use ResNet-101 with 4 frames rather than ResNet-18 with 16 frames (ablation)ResT · UCF101 0/50top-1 accuracy (%): 54.7 -> 57.0Helped
classify in visual space using semantic transfer rather than map into semantic space (ablation)ResT · UCF101 0/50top-1 accuracy (%): 48.9 -> 54.7Helped
fine-tune pretrained C3D features end-to-end (ablation)ResT with C3D · UCF101top-1 accuracy (%): 40.5 -> 52.7Helped
use ResNet-101 instead of ResNet-18 (ablation)ResT · UCF101 50% classestop-1 accuracy (%): 54.7 ± 2.3 -> 58.7 ± 3.3Helped
use ResNet-101 instead of ResNet-18 (ablation)ResT · HMDB51 50% classestop-1 accuracy (%): 39.3 ± 3.5 -> 41.1 ± 3.7Helped

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