C2W3_Lab_01_Model_Evaluation_and_Selection for Neural Network

Course Q&A Machine Learning Specialization Advanced Learning Algorithms
1

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Please, how do you come up with the number of layers and unit per layers?

2

Is this from a quiz, or just a general question?

If the latter, it’s based on your experience and experimentation. The goals are to get good enough results while minimizing the computational cost of training.

3

The latter. Thanks! But it there some general rule of thumb to select the initial number of layers and nodes? Will I learn that in week 4? If yes, sorry if I am jumping ahead.

4

Nothing concrete. Just guidance like this:

  • Start with one hidden layer.
  • Adjust the number of units to see if you get “good enough” performance.
  • If you don’t get good enough performance, considering adding another hidden layer.
5

Thanks!