Frame selection algorithm

[Peight99]

Dear authors, first thing first, your job is amazing. Deep congratulations. I am studying your algorithm in order to use it on my project. I have one question: when searching for the frame selection part I am not able to find it. I looked in the class PretrainVisionTransformerEncoder inside the modeling_pretrain.py script. Can you tell me where I can find it? Thanks in advance!