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You also evaluate your model on the test set, and find the following:

Human-level performance 0.1% Training set error 2.0% Dev set error 2.1% Test set error 7.0% What does this mean? (Check the two best options.)

  1. You have underfit to the dev set.

  2. You should get a bigger test set.

  3. You should try to get a bigger dev set.

  4. You have overfit to the dev set.

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I think answer are options 3) and 4)

Clearly there seems to be overfiting towards dev set as the dev set error is low and almost equal to training set error.

And increasing the number of samples helps minimizing overfiting problem..

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