🚀 Feature

Add --cache-images option to detect.py like train.py

Motivation

There R about 300k images in my--source directory, when i run detect.py, I noticed that it seems like load and test images one by one , and my pc sound "pew-pew-pew-pew..." like a rushing laser weapon, maybe the disk is trembling. And it consumes a long time.

Maybe cached option（read from disk, and test direct in RAM） can speedup ? Or yolov5 has integrated this featue and just not provide visible option for users?

Pitch

Add --cache-images option to detect.py like train.py

Alternatives

Maybe add a script that make a big cache file from --src imgs?

Additional context

None.