Answers.Body: <p>It's an uppercase &quot;J&quot; from the math calligraphy alphabet, i.e. <code>\mathcal{J}</code> in latex.</p>
  <p><span class="math-container">$\mathcal{J}$</span></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-11-03T15:33:24.543Z
Answers.LastActivityDate: 2021-11-04T13:14:53.130Z
Answers.LastEditDate: 2021-11-04T13:14:53.130Z
Answers.UserDisplayName: Taw
Body: <p>What is the name of this letter <span class="math-container">$\mathcal{J}$</span> in the following deep learning equation? And what alphabet it is from?</p>
  <p><span class="math-container">$$\mathcal{J} = \frac{1}{m} \sum_{i=1}^m \mathcal{L}^{(i)}$$</span></p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-11-05T01:03:04.557Z
Comments.Text: I’m voting to close this question because it seems to me that it belongs to https://tex.stackexchange.com/.
Comments.UserDisplayName: hanugm
Tags: <deep-learning><notation><loss>
Title: What is the name of this letter $\mathcal{J}$?
UserDisplayName: Paul Reiners
ThreadText: # What is the name of this letter $\mathcal{J}$?
  
  (Asked by: username_0 on 2021-11-03)
  
  What is the name of this letter $\mathcal{J}$ in the following deep learning equation? And what alphabet it is from?
  
  $$\mathcal{J} = \frac{1}{m} \sum\_{i=1}^m \mathcal{L}^{(i)}$$
  
  **Tags:** deep-learning, notation, loss
  
  > **Comments:**
  > **username_1**: I’m voting to close this question because it seems to me that it belongs to https://tex.stackexchange.com/.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2021-11-03. Score: 5 | Accepted answer
  
  It's an uppercase "J" from the math calligraphy alphabet, i.e. `\mathcal{J}` in latex.
  
  $\mathcal{J}$
  
  
  ---
  
  