University of Michigan - Ann Arbor

We don't count the input layer and the number of layers is defined as the number of hidden layers plus one for the output layer.
For example, in the following MLP, there are two layers.

Number of Layers in a Feed Forward Neural Network

Machine Learning Yearning, a free ebook from Andrew Ng, teaches you how to structure Machine Learning projects.
https://www.deeplearning.ai/machine-learning-yearning/

Note: The content of the book is aligned with the Coursera Deeplearning.ai specialization.  https://www.deeplearning.ai/deep-learning-specialization/ 

Machine Learning Yearning (Deeplearning.ai)

Which of the following statements is true about layers of a deep neural network?

- Single layer NN
- 2-layer NN
- N-layer NN

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