Во время первой публикации (в году) YOLO имела передовую mAP (mean весов из оригинальной тренированной модели YOLO в Darknet. added correct calculation of mAP, F1, IoU, Precision-Recall using command darknet detector map added drawing of chart of average loss during training; added. собственную разработку, написанную на языке C – Darknet . В качестве метрики была использована mAP с порогом IOU, равным.
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Any advice would be greatly appreciated. Regards, Setnug. SetNug SetNug 2 2 silver badges 11 11 bronze badges. Add a comment. Active Oldest Score. Yes, this is the way to do what you wanted. Venkatesh Wadawadagi Venkatesh Wadawadagi 2, 16 16 silver badges 28 28 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. A collaborative hub for infrastructure as code.
Featured on Meta. New post summary designs on site home pages and greatest hits now; everywhere Changes to answer sorting menu: moving menu, "Newest" sort option, renaming Outdated answers: up next, changes to sorting menu. This would ensure that you are as tight as possible around the image boundaries and that you are keeping the grey area to minimum. I will try to fix this code and PR once I get to training myself. Other than different aspect ratios, something else that should be taken into account to get performance comparable to Darknet training is different resolutions.
When training YOLOv3 using darknet - not only image AR is changed but the actual final image resolution is also changed i. A training YOLOv3 model naturally supports every image for which both height and width are multiples of This is used during training to get better robustness to varying object sizes.
This is also the reason the original YOLOv3 model is the same one for all three resolutions in the paper , , When training using Darknet it would seem the model both upscales and downscales both height and width to achieve this. I am in the process of implementing this but I wonder if anyone else already did it. This is also useful but should be performed regardless and after what I just described.
I have an implementation of this commented out currently in train. If these lines are uncommented then each epoch will train on a random image size from - Aspect ratio is different though, this should always be constant.
The bigger question is what effect this has on the mAP at , etc. I use multi-scale training like glenn-jocher nirbenz :. The torch. I can still update weights every 16 images, though two changes make the training take about 2X longer. Darknet changes the image size throughout the training according to the following rule. So up to the last batches the image size changes for every 10 batches. The image size is kept same x for the last batches.
I thought changing the image size every 10 batches prevents the model to overfit a particular image size. However, your method might work as well imo. In order to deal with different image sizes, the layers are resized as follows:. In practice, images with different aspect ratio are padded to the same aspect ratio to train on gpu.
You should follow similar steps for your dataset. Actually i want to know if this code is useful for my small dataset, because there are many troubles you guys met. I used it for the xView challenge this summer. The latest commit produces 0.
Darknet reported mAP is 0. I have not tried to train fully with --multi-scale enabled however, or perhaps to simply train at --img-size And yes this is on COCO you mentioned. So the proper comparison is darknet With COCO14 there is a roughly split, so common practice is to merge them and choose a small subset for test.
This is what 5k. But because of that, evaluating YOLOv3 using original weights must be done on the 5k split performed by the author. Otherwise you are probably testing on some of the train-set. Thanks for sharing this repo. Only when the best anchor in all 9 anchors is at the current yolo layer the prediction joins training.
In short, a target is only assigned to 1 yolo layer, 1 anchor. In this repo, a target can be assigned to multiple yolo layers, and all of them calculate loss and gradients, which could affect the training significantly. This is a tunable parameter that I set a while back after some trial and error, though the repo was in a substantially different state at the time, so perhaps it needs retuning.
You are also correct that this means that an object can be assigned to multiple anchors, perhaps even 3 times, one in each layer. I did not know darknet was only assigning an object to one of the 9 layers. This would be difficult to replicate in this repo as each of the yolo layers creates its own independent loss function, though you could try to do this, and to tune the rejection threshold I would vary it between 0.
Unfortunately I only have one GPU and limited resources to devote to further improving the repo. Any help is appreciated! See 71 comment for more info. Skip to content.
Darknet calculate map правда и ложь о марихуанеWhat is Mean Average Precision (mAP)?
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