Train an NN using SIFT information

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I have keypoint information using the SIFT descriptor for an image dataset/s. I need to train a network to predict the characteristic scales (labels) of the keypoints. My question is regarding the input data to the network. How can I feed the input image and the keypoint information (datapoint) with the corresponding label into the network? Can I make use of the coordinates of the keypoint as an anchor point in an image? and if yes, how?

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