Learning PyTorch with Examples Audit

[jiannanWang]

Fixes T237454989.

Description

This PR removes the empty "Example" sections from the tutorial. These sections were intended to be redundant, but currently contain no content, as shown below. This PR deletes them since they do not provide any additional value.

It also adds requirement for torch and numpy packages.

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3600

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

✅ No Failures

As of commit ade91f7 with merge base f526f25 ():
💚 Looks good so far! There are no failures yet. 💚

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[svekars]

I think those shouldn't be deleted. you can remove :hidden: from the toctrees so the list of sections appear.

[jiannanWang]

I think those shouldn't be deleted. you can remove :hidden: from the toctrees so the list of sections appear.

Got it. I reverted the sections and removed :hidden: from the section.

[svekars]

Did you have a chance to go over all the sections under Learning PyTorch with Examples:

https://docs-preview.pytorch.org/pytorch/tutorials/3600/beginner/pytorch_with_examples.html

[jiannanWang]

Did you have a chance to go over all the sections under Learning PyTorch with Examples:

https://docs-preview.pytorch.org/pytorch/tutorials/3600/beginner/pytorch_with_examples.html

I ran all the code examples listed on the page, including:

beginner_source/examples_tensor/polynomial_numpy.py
beginner_source/examples_tensor/polynomial_tensor.py
beginner_source/examples_autograd/polynomial_autograd.py
beginner_source/examples_autograd/polynomial_custom_function.py
beginner_source/examples_nn/dynamic_net.py
beginner_source/examples_nn/polynomial_module.py
beginner_source/examples_nn/polynomial_module.py
beginner_source/examples_nn/polynomial_optim.py

All code ran successfully, with no deprecation warnings or errors.

The links to other pages are initially hidden. I reviewed them and noticed that the documentation uses pi instead of \pi in several places, which causes display errors. I have corrected these typos.