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updated yolov3 readme

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Aladdin Persson
2021-02-22 17:25:54 +01:00
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ML/Pytorch/object_detection/YOLOv3/README.md
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@@ -9,14 +9,15 @@ $ git clone https://github.com/aladdinpersson/Machine-Learning-Collection
$ cd ML/Pytorch/object_detection/YOLOv3/
$ pip install requirements.txt
```
### Download pretrained weights on Pascal-VOC
Available on Kaggle: coming soon
### Download Pascal-VOC dataset
Download the preprocessed dataset from [this](www.kaggle.com/aladdinpersson/pascalvoc-yolo-works-with-albumentations). Just unzip this in the main directory.
### Download Pascal VOC dataset
Download the preprocessed dataset from [link](www.kaggle.com/aladdinpersson/pascalvoc-yolo-works-with-albumentations). Just unzip this in the main directory.
### Download MS-COCO dataset
Download the preprocessed dataset from [this](www.kaggle.com/aladdinpersson/mscoco-yolo-works-with-albumentations). Just unzip this in the main directory.
### Download MS COCO dataset
Download the preprocessed dataset from [link](www.kaggle.com/aladdinpersson/mscoco-yolo-works-with-albumentations). Just unzip this in the main directory.
### Training
Edit the config.py file to match the setup you want to use. Then run train.py
@@ -29,6 +30,14 @@ Edit the config.py file to match the setup you want to use. Then run train.py
The model was evaluated with confidence 0.2 and IOU threshold 0.45 using NMS.
### Things I'm unsure of
From my understanding YOLOv3 labeled targets to include an anchor on each of the three different scales. This leads to a problem where we will have multiple
predictions of the same object and I think the idea is that we rely more on NMS. The probability of an object in loss function should correspond to the IOU
with the ground truth box, this should also alleviate with multiple bounding boxes prediction for each ground truth (since obj score is lower). When loading the
original weights for YOLOv3 I good mAP results but the object score, no object score seems to be a bit different because the accuracy on those aren't great.
This suggests there's something wrong with the two implementations, but not sure what it could be. Both seems to work at least. The original YOLOv3 paper also used
BCE loss for class labels since some datasets are multi-label, however I thought it was more natural to use CrossEntropy because both Pascal and COCO just have a single label.
## YOLOv3 paper
The implementation is based on the following paper: