May I know how to create confusion matrix ?

[Hrishkesh]

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[Hrishkesh]

I could generate mAP and IOU but, I need a matrix to visualize how many true positives are detected.
So I can have it in my final report of my master thesis.
for example in my case, I have three classes to detect from a single image.
such as company name, date, and amount from the invoice image.
Such that I can an overview of how many times the company name, date, and amount is been detected in the test/valid data set.