Heey, I have a bit of a tough time of understanding you. Please answer the following

How many classes do you have?
Do you want to pair up one image to one class? Otherwise, explain what you want to do
How many images do you have in total? How many of them are currently used as training images?
What do you mean with multi-class conf_matrix? Edit: Ah I see now, all the medium articles are for binary problems. Here is one example 2 for multi class

If possible, I’d use a graph plotting tool like plotly or matplotlib to plot the confusion matrix as heatmaps. You can use the sklearn implementation of a confusion matrix to get this to work quite easily