Migrating the Keras backend to PyTorch

[cantordust]

Moving to PyTorch as the Keras backend.

Closes #602

[github-actions]

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🔍 Inspect the changes: https://github.com/carpentries-lab/deep-learning-intro/compare/md-outputs..md-outputs-PR-624

The following changes were observed in the rendered markdown documents:

 1-introduction.md | 12 ++++++++----
 2-keras.md        | 40 +++++++++++++++++++++-------------------
 md5sum.txt        |  6 +++---
 setup.md          | 45 ++++++++++++++++++++++-----------------------
 4 files changed, 54 insertions(+), 49 deletions(-)

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⏱️ Updated at 2025-12-09 15:41:19 +0000

[carschno]

Good start, thanks!
I would prefer to not change the X_train and X_test capitalization here because there are many other places in the lesson and in the slides which use it, and they should remain consistent.

[carschno]

I would prefer X_train/X_test to remain consistent with the capitalization across all episodes.

[carschno]

Suggested change

	It is a standalone python package that supports multiple deep learning frameworks as backends, and it can be imported using `import keras`.
	It is a Python package that supports multiple deep learning frameworks as backends, and it can be imported using `import keras`.

[ashwinvis]

Also no need to change this. This is how "macOs" is written, at least nowadays.

[ashwinvis]

Nice catch. Clearly some of the narrative has to be changed too!