I found an Error or Typo in the Book — what now?

Excellent – well… in any case, please let me know so that I can add it to the list of errata and fix it in a future edition of the book. There are two ways for doing this:

• Alternative 1: send me an e-mail with a brief description of the problem: mds-book ∂ proton.proton.me
  
• Alternative 2: Go to the book's GitHub repository and create an "issue" consisting of a short title (e.g., "typo in chapter 8") and a description (e.g., "equation 3 on page 33 should start with a capital X").
  
  
  Note that for submitting a GitHub issue you need to be logged in to your Github account.

List of Errata

Below are the most important corrections:

• page 48: Within "Definition 3.11 (Specific data record or data point)", in the sentence "The record number i consists of the input data x_j = ..." should be "....x_i =..."
  [found by GitHub user zym10031]
• page 103: John von Neumann died in 1957 (and not 1857)
  [thanks to GitHub user Meisenbart]
• page 451: Example 16.3 last line: "Therefore, it has slightly...:" should be removed
  [found by GitHub user IAS-DW]
• page 503-504 [spotted by GitHub user IAS-DW]:
  • $\partial J/\partial b_3$ ? from the bias of the last layer is missing in the text;
  • $b_3$ to be added to eq. 18.7, 18.14 ; in eq. 18.9 the bias $b_3$ is included.
  • equation 18.39: it should be $W^{(k)T}$ transposed and also in its later occurrence (eq. 18.47) $\partial J/\partial y_i^{(k-1)}=\partial J/\partial y_r^{(k)} w_{ir}^{(k)} $ in index notation
  • equation 18.51: the derivative of the activation function got lost...