Computer scienceData scienceMachine learningIntroduction to deep learning

Basics of neural network architecture

Theory

The mysterious digit

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Suppose we have a neural network that can recognize a digit, but the number of recognized digits is limited — we can only tell if the number is 0, 3, 6, or 9. We've fed some mysterious picture to the network, and the output layer is presented below:

A synthetic neural network that accepts an image and has 4 classes[0, 3, 6, 9] on output with probabilities [0.05, 0.2, 0.7, 0.05]

If we are to trust the model's prediction, which digit is pictured in the input?

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