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How does confusion matrix table work on 60 class or more

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Abdullah 2022-8-13

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评论： Abdullah 2022-8-14

i wont do onfusion matrix for 60 class or more like this picture To find out TP,TN,FP,FN

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Walter Roberson 2022-8-13

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confusionchart perhaps

Abdullah 2022-8-13

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It works on a few class

i have 60 class or more

Walter Roberson 2022-8-13

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在 MATLAB Online 中打开

Ran in:

confusionchart can handle those sizes.

confusionchart(randi(20,60,60))

Abdullah 2022-8-13

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Is it possible to make it look like this or no?

Walter Roberson 2022-8-13

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https://www.mathworks.com/help/deeplearning/ref/plotconfusion.html#mw_6e69e9bc-83d4-415a-b1af-471779286b0d perhaps

Abdullah 2022-8-13

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THANK YOU IT'S THE SAME NOT WORK

Walter Roberson 2022-8-13

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The example at that link shows 10 classes being plotted in the format you asked for. What happens when you do your 60 classes?

Abdullah 2022-8-13

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Walter Roberson 2022-8-13

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@Abdullah

You are using confusionchart() rather than the plotconfusion() that I posted the more recent link to.

Abdullah 2022-8-13

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Walter Roberson 2022-8-13

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Ran in:

That looks to me as if it is working. Just enlarge your plot area.

You want to be able to have outputs such as '46.2%' . You can't really read anything less than 8 point font, which is going to need 26 pixels wide for that character string (and more space would be preferred.) That would take at least

26*60
ans = 1560

1560 pixels wide, plus some more for the ticks and the axes labels; those class labels would take at least 32 pixels wide. So you are probably looking at around 1650 or more pixels wide to be readable.

Abdullah 2022-8-13

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its 60 classes Each of them has 20 elements

Walter Roberson 2022-8-13

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Yes?

Your sample plot has a '51.6%' in the middle of it. After having reduced down to 8 pixel font instead of the default 10 pixel font, the string '51.6%' takes 26 pixels width. You have 60 classes, so you need to allow space for (60 copies of 26 pixels) = 1560 pixels wide for the percentages drawn in the boxes. You have to allow 32 pixels for the '200170' class label. You need to allow 8 pixels for the sideways 'Output Class' label. That is a minimum of 1600 pixels width you need in order to be able to draw that chart -- probably more. If your window is not at least that wide then you will get overlap of characters.

Abdullah 2022-8-13

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It's not enough for thes big dataset

In addition to casia v4 which contains 1000 class

Walter Roberson 2022-8-13

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Okay, suppose that you are dealing with a chart with 1000 classes. And suppose that you have an Apple Retina display, 2880 x 1800 pixels. Then at best you can allocate each class 2.88 pixels of width. You wish to display 3 numeric characters plus a symbol, (such as 51.6%) so you can afford to allocate 2.88/4 = 0.72 pixels per character at best.

Are you able to read characters that are 0.72 pixels wide?

What is your plan to be able to display 1000 classes in a single chart? How many pixels per box were you thinking of allocating? Do you have a display that is 1000 times that number wide?

Abdullah 2022-8-13

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I just want to have a table that contains TP,TN,FP,FN like this picture

Walter Roberson 2022-8-13

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编辑：Walter Roberson 2022-8-13

在 MATLAB Online 中打开

Ran in:

@Abdullah

Yes, and you want to have that for 1000 classes. That table is 2 classes plus a marginal value, and is (2+1) boxes wide by (2+1) boxes high. For 1000 classes you would have (1000+1) boxes wide by (1000+1) boxes high. Each box needs at least 28 pixels wide if an 8 point font is used, and the class label takes 32 pixels, so you need a display that is at least

(1000+1)*28 + 32
ans = 28060

over 28 thousand pixels wide.

Unless, that is, you want MATLAB to generate

1000 * (1000-1)/2
ans = 499500

close to half a million different 3 x 3 graphs, each comparing exactly two classes against each other ? Like one for class 17 vs 83, one for 17 vs 84, one for 83 vs 717, and so on ?? You might be able to fit 3 of those comfortably across, so it would only take about

200 * (499500/3)  %pixels high times graphs required divided by graphs wide
ans = 33300000

33 million or so pixels high.

Abdullah 2022-8-13

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This is impossible.

thank you very much sir

Walter Roberson 2022-8-14

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@Abdullah

MATLAB can generate the graph, and you can see the details if you zoom in enough, probably about 28:1

Abdullah 2022-8-14

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yes, you're right

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How does confusion matrix table work on 60 class or more

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