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Confusion matrix weird results #2964
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@constantinfite That's interesting, but it doesn't make much sense. |
@xinxin342 yes I checked again and got the same result ... |
This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. |
I have the same confusion. What a confusion matrix! |
@zxcamazing i understand the confusion here. It seems like you're experiencing unexpected results with the generated confusion matrix. The change you made to the When considering a confidence score threshold, it's important to note that this would impact the number of true positives, false positives, etc., as detections below the set threshold would not be accounted for. To fully understand the issue and provide the best guidance, I'd recommend taking a step back and reconsidering the modifications made to the In case you need further assistance, our comprehensive documentation at https://docs.ultralytics.com/yolov5/ can be helpful for reference. Let me know how it goes! |
❔Question
Hi, I remove the line
array = self.matrix / (self.matrix.sum(0).reshape(1, self.nc + 1) + 1E-6) # normalize
at the line 164 in the file metrics.py to obtain the real number of true positive, true negative ...When I don't set the confidence score threshold it gives me this confusion matrix
These results match with my data I have 613 objects (sharks) to detect ( 551 are detected (TP) and 62 are not detected (FN))
Now when I set the confidence score threshold at 0.7
![confusion_matrix](https://user-images.githubusercontent.com/57963890/116415027-505ff400-a839-11eb-8391-54491e00e7be.png)
--conf 0.7
it gives me this matrixWhat I don't understand is that when I sum the TP and the TN for the class shark this time it gives me 448+39 = 487 and not 613.
Do you have any idea why it returns this result ?
Thanks!
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