Questions tagged [yolo]
"You Only Look Once", a Deep Learning-based object recognition algorithm available in several different software implementations.
7
questions
27
votes
5answers
40k views
Yolo Loss function explanation
I am trying to understand the Yolo v2 loss function:
\begin{align}
&\lambda_{coord} \sum_{i=0}^{S^2}\sum_{j=0}^B \mathbb{1}_{ij}^{obj}[(x_i-\hat{x}_i)^2 + (y_i-\hat{y}_i)^2 ] \\&+ \lambda_{...
1
vote
1answer
2k views
How to calculate the class probability of a grid cell in YOLO object detection algorithm?
I am going through the YOLO paper by Redmon, Divvala, Girshick & Farhadi (2015),
"You Only Look Once: Unified, Real-Time Object Detection" (arXiV page here )
On the fourth page it mentions the ...
7
votes
1answer
2k views
On Yolo, and its loss function
I'm having a hard time understanding some on the inner-working of YOLO, especially the loss function depicted in this seminal paper. Bear in mind that I'm nowhere closed to being a specialist in deep ...
3
votes
0answers
961 views
What is the need of multiple Bounding Boxes per grid cell in YOLO v1?
This question is regarding YOLO v1 architecture as in here.
I am confused as to why authors have used 2 bounding boxes per grid cell for training.
Assuming there can be only one object per grid cell. ...
2
votes
2answers
3k views
How does the YOLO network create boundaries for object detection?
I'm not sure I understood how the YOLO network works. If you look at the description, https://pjreddie.com/darknet/yolo/, it appears to me that all is done thanks to convolution only. You end up with ...
1
vote
0answers
52 views
yolo v1: how gradients in grids with no objects overpower
I am reading yolo v1 paper. I am having confusion while trying to understand this:
"Also, in every image many grid cells do not contain any
object. This pushes the “confidence” scores of those ...
1
vote
0answers
402 views
The reason for multiple bounding boxes use for each grid cell - YOLO
I'm not quite sure what is the main reason why YOLO uses multiple bounding boxes for a grid cell. An answer I can find on web is for multiple aspect ratio in the prediction. However I don’t think it’s ...
