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c5fa13aa - [Pipelines] Add a section on generating captions and embeddings for Pix2Pix Zero (#2395)

[Pipelines] Add a section on generating captions and embeddings for Pix2Pix Zero (#2395) * add: section on generating embeddings. * Apply suggestions from code review Co-authored-by: Pedro Cuenca <pedro@huggingface.co> * apply changes from code review. --------- Co-authored-by: Pedro Cuenca <pedro@huggingface.co>