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I have given with a image dataset of 1000 classes , each class has 100 images. Now My requirement is to train a model which will take a image as input, and it should answer whether the image is present or not, there is no need to specify which class it is.. It just has to say yes or no.

I thought of using a CNN with a sigmoid function at last layer, but not able to connect the dots.

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There is an example of classification in this repository:
DogVsCat

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It sounds like you want to do this: https://en.wikipedia.org/wiki/Object_detection. Without more information on your specific problem, there's not much more I can say, but suggest you start there.

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  • $\begingroup$ This is one of the interview question asked to me, Let's say we are given with CIFAR dataset, consider the dataset contains only dogs and cats of different types total divided into classes. Now our requirement is , to train a model which can take a new image as input and should tell whether it is from one of the trained classes or not. $\endgroup$ – GOPI M Apr 2 at 7:20
  • $\begingroup$ Iam still learning ML and Deep learning concepts,Only one thing that came to my mind is to use a CNN network with a sigmoid layer at output. $\endgroup$ – GOPI M Apr 2 at 7:21

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