There are a number of points in this course where issues around needing more data of particular types come up, but this course (and the whole DLS specialization) are not really about how to acquire and prepare data. That is a separate area altogether and falls under the heading of “data science” as opposed to “deep learning”. Data science is a huge and important area. If you want to look into that, Deeplearning.AI offers a Practical Data Science Specialization. I have not personally looked at any of those courses yet, but I’m sure anything from Deeplearning.AI is worth a look.
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