🛠️ fix incorrect COCO class id loading

[SkalskiP]

Description

Draft of PR fixing issues mentioned #150. It is an alternative to the #169 solution.

[SkalskiP]

Hi, @hardikdava 👋🏻 did you have a chance to test this?

[hardikdava]

@SkalskiP Let me test and confirm your fix.

[hardikdava]

@SkalskiP Test summary:

Case-1: from_coco() -> to_coco()
Works fine if image_id and labels_id starts with 0

Case-2: from_yolo() -> to_coco()
image_id and labels_id starts with 0 after saving as coco format. But no mixed up in categories.

[SkalskiP]

@hardikdava, as for case 2, do you think we would like image_id and labels_id to start from 1?

[hardikdava]

@SkalskiP Yes, based on my research and description from coco, opencv, etc it is their standard format to start image-id and label-id starting from 1. Once this is fixed then we are good to go.

[hardikdava]

Please make this small changes and we can close this.

[SkalskiP]

@hardikdava, that should be easy. I'll update .to_coco logic before merging.

[SkalskiP]

@hardikdava given the fact that @yclicc tested the code and it works as expected. (read more here #150) I'll probably close #169. Is it okey with you?

[hardikdava]

@SkalskiP Yes, please mark it as completed.