NEW: recipe tutorial on how to calculate layer output dimensions

[loganthomas]

Fixes #2926 Replaces #2923 (accidental deletion)

Description

New recipe tutorial on how to calculate layer output dimensions

• How to transition from convolution and pooling layers to linear layers in a model
• How to manually calculate the output dimensions after applying a convolution or pooling layer
• How to print the shape of internal tensors for inspecting dimensionality changes in a model
• How to use the torchinfo package to show output dimensions for all layers in a model

Checklist

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

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2944

• :page_facing_up: Preview Python docs built from this PR

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:white_check_mark: No Failures

As of commit 6ce19d75c32cdbba7c8a6434787f79ecd8daaf4f with merge base 0740801fa8df2464f4d931d36a4bd7ada9cd0519 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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