Optional topics: where are their slides?

Hi, I have downloaded all slides for MLS but I found some optional topics don’t have their slides in the downloads. For instance c3w2 slides are missing the principle component analysis part. I also remember in one of the previous courses the back prop optional topic didn’t come with their pages in the course PDF files. Did I miss anything or it was just not uploaded by deep learning.ai?

Thanks.

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The PCA materials were added much later, after the courses were created. There are no published slides for this added material.

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