[GitHub] kohr-h opened a new pull request #13094: WIP: Simplifications and some fun stuff for the MNIST Gluon tutorial

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kohr-h opened a new pull request #13094: WIP: Simplifications and some fun stuff for the MNIST Gluon tutorial
URL: https://github.com/apache/incubator-mxnet/pull/13094
 
 
   ## Description ##
   
   This PR removes some of the (IMO) unnecessary complexity from the tutorial (one of the first that new users click on) by *always* using 1 GPU or 1 CPU. This makes the MLP training code much more straightforward (no splitting, no inner loop).
   I also think that there was too much staccato of obvious comments in that part, while the truly non-obvious parts were left uncommented (e.g., what is `ag.record()`?). I tried to straighten up that part a bit, although I think some comments are still a bit on the obvious side.
   
   Furthermore, I added a small section where some of the mislabeled (apparently it's one "l", need to fix that) images are plotted together with the predicted and true labels. I think that's more fun than just looking at an accuracy score.
   
   I'm not finished with the whole tutorial yet, so it's WIP, but I'd like to know what you think before I put more work into this PR.
   
   **Note:** I've included the 2 new images in the same directory as the tutorial for convenience, they would obviously need to go somewhere else.
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [ ] Changes are complete (i.e. I finished coding on this PR)
   

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