Co-authored-by: Nswsong <swsong@stratosphere.mobi>

* Update requirements.txt

I found that if we would like to calculate FLOPS in this project, we must install thop.
but there's no thop package inside the requirements.txt

https://github.com/ultralytics/yolov3/blob/master/utils/torch_utils.py#L108

* Update requirements.txt
Co-authored-by: NGlenn Jocher <glenn.jocher@ultralytics.com>

Co-authored-by: NPriteshkumar Bharatbhai Gohil <pgohil@assystemtechnologies.com>

The correct command for downloading coco dataset 2014 is supposed to be "!bash yolov3/data/get_coco2014.sh"

Signed-off-by: NGlenn Jocher <glenn.jocher@ultralytics.com>

Signed-off-by: NGlenn Jocher <glenn.jocher@ultralytics.com>