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Start with the examples, and don't even think about markets until you can explain all of those examples.
Answers
An ID column is an Identifier column, it does not get used in learning.
A Label column contains what is to be learnt.
Hope that is clear.
what u mean by not used in learning? i mean if i have stock-id, date, which of them is best to be used as column-id?
do i must use close filed as label?
BR