Clean up installation instructions

[larryv]

This is in response to a user (@monacv) who had to ask the #bash Freenode IRC channel for help with your instructions.

[monacv]

Thanks so much! #bash IRC channel is definitely on the list of top 10 IRC channel

[ZainKhalidOfficial]

I want to run your code on my system. But the Installation Instructions are unclear.

README.md

And i really need your help.

(1)
For example, Their is no requirements.txt file within your code file that will help install all necessary modules & packages.

pip3 install -r requirements.txt

Problem: Without the requirements.txt file & thus not installed modules the code keeps running into errors.

(2) To Evaluate Performance V-COCO & HICO-DET Dataset is needed to be downloaded.
By your instructions we install cocoapi.

Then you direct us to another Project to download V-COCO & HICO-DE Dataset & set evaluation.

Problem: Their is a lot of confusion about where to put downloaded images.. (In cocoapi or the reference paper downloaded dataset files. Where to put images folders inside the coco folder & run setups as per the instructions in cocoapi dataset folder or the reference paper coco dataset folder. etc. ).

(3) Download trained model from your gdrive.

Problem: You asked us to put it into relevent weights folder. But their is non in your code.

(4) To run
python3 test_HOI.py ctdet --exp_id coco_hg --fix_res --arch hourglass --flip_test --load_model /path/to/model/weights

Problem: What is what?