# Can deep learning be a good way to learn a “High-quality” simple functions for images? For example, identical transformation, rotation, translation. [closed]

Can deep learning be a good way to learn a "High-quality" simple functions for images? For example, identical transformation, rotation, translation, even a linear mapping.

## closed as unclear what you're asking by YiFan, NCh, Lee David Chung Lin, Lord Shark the Unknown, LeucippusMar 25 at 5:22

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• What does "learn a 'high-quality' simple functions for images" even mean? Can you please clarify? – YiFan Mar 22 at 8:36
• @YiFan sure, I think how to define "high-quality" accurately is a difficult problem. There is an easy way to do it: for example, we already have an identical transformation f. First, let's make a transformation f for cifar10， then test whether there is a huge difference between the classification results and result about the data without f for the same model. – Z.Huang Mar 23 at 9:26

The question is interesting , but vague , so may answer inherits the last property. In deep learning the models are highly nonlinear functions with lots of parameters . One consequence is that this models are very flexible - in the limit they can approximate anything, including any kind of linear mappings . However ,even if the data has a linear dependency , what you probably get after training such a model is a complicated non-linear function (but the quality of the predictions can be good ).

If you know that the data comes from a linear model, it is probably best to try to learn such a model using a more specific algorithm ( a random example: On Learning Rotations - Raman Arora ).

• Thanks, I try to define a rule (about classification results) on this problem as shown in the comments section above. – Z.Huang Mar 23 at 9:30