I realize I was ignorant of 2 things since posting this question,
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There is a datasets forum that this question should probably have been posted to.
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In the time-series-transformer blog post and demo notebook, the instructions point to GluonTS and converting data from a pandas dataframe into a proper dataset.
I still haven’t figured it out yet but I am posting a more clear question in the Datasets section, with the promise that if someone gives me a solution, I will share 2-3 years of M5 price data for every equity in the SP500 to the hub, public for anyone to use. I have this data already. It usually costs money for people to get, but I harvested it from different APIs and its in CSV format.