Vol2 hpo

[aaronkl]

Description of changes:

Add initial set of notebooks for the HPO chapter: index, intro, api, hyperband, async RS, async SH.

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[d2l-bot]

Job d2l-en/PR-2372/61 is complete.
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[mseeger]

OK, I am signing off. This should go through now, and if not, nothing I can do

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[astonzhang]

Thanks for all your amazing work! To save everyone's time I've added my edits directly on the PR. In the future (including the following TODO), please raise PR directly on the master branch.

TODO @mseeger (by EOD today. Time estimation: ~15 mins)

For each notebook: please create a discussion post under category "English Version - pytorch" (you'll need to sign up an account) at https://discuss.d2l.ai/c/english-version/5 and add that post at the end of the corresponding notebook

Example:

At the end of https://raw.githubusercontent.com/d2l-ai/d2l-en/master/chapter_linear-classification/softmax-regression-scratch.md

we add (plz remove the [topic name] in the URL: discuss.d2l.ai/t/[topic name]/[topic id] -> discuss.d2l.ai/t/[topic id])

:begin_tab:`pytorch`
[Discussions](https://discuss.d2l.ai/t/51)
:end_tab:

where https://discuss.d2l.ai/t/softmax-regression-implementation-from-scratch/51 was created correspondingly

TODOs @aaronkl (next week if possible)

• Add exercises for every notebook
• Fig 19.3.1, 19.5.1, 19.5.2: Apply correct font size in https://github.com/d2l-ai/d2l-en/blob/master/STYLE_GUIDE.md#figure. Use transparent background. Upload graffle files to graffle/hpo/ on d2l-en repo.
• Need more space efficient display of tuner.run() output INFO:XXX in rs-async and sh-async, and tuner.run(number_of_trials=30) output plots in sh-intro
• sh.svg cannot display properly in html so I used sh.png tentatively. We'll still need svg for this figure (need to troubleshoot).

[mseeger]

Somehow, I cannot sign up for an account for comments. Says that there were too many accesses from my IP address?

[AnirudhDagar]

Weird! Can you please try with your mobile network?

[mseeger]

OK, I have an account. I suppose I need to create a separate discussion topic for each section?
I posted one, but it needs to be reviewed. When trying to post another one, the system blocked me.

Leaving this for later.

[AnirudhDagar]

Approved!

[mseeger]

OK, I created 4 topics, but now I am blocked again. How urgent is this?

I created a new branch, which does two things:

• Reduce log output for tuner.run()
• Add these discussion things at the end (except for one notebook)

Do you want me to create a PR with this now, or can this wait until I maybe thought about some exercises?