problems about feature extraction models

[kuzra]

Hi,tgc! I tried using Torch's fasterrcnn_resnet50_fpn pre-trained model to extract the region_features of the video, but found that the feature shapes I extracted were only [823, 4], which is far from [26, 36, 2048] and [26, 36, 5] in the dataset you provided. What does the extra dimension mean, or what do these three dimensions mean respectively?
I wonder that is it feasible to use Torchvision's fasterrcnn_resnet50_fpn model to extract features without using caffe's Fast R-CNN model?The sizeof features extracted using Torchvision's fasterrcnn_resnet50_fpn model is significantly insufficient.How can I extract more features and accurate feature dimensions that meet the requirements?