Week 4, "Optional Reading: Feedforward Neural Networks in Depth-Part 1"


Hello, would you mind asking a question how (13) and (14) are derived? It is hard to understand where the index i came from and how a_{k,i}[1] corresponds to z_{j,i}[2]/w_{j,k}[3] in (13). Thank you for your patience.


  1. l ↩︎

  2. l ↩︎

  3. l ↩︎