[Feature] Hi im thinking of outputing features in npy format using I3D models , but dont really know which part of teh code should i change

CHIATEEHENG

### What is the problem this feature will solve? im currently using --dump.result.pkl which is the pickle format , but i want to amend the code to make it generate npy file ### What is the feature? im currently using --dump.result.pkl which is the pickle format , but i want to amend the code to make it generate npy file ### What alternatives have you considered? _No response_