No, they are not different classes. Hope below sample structure explains it better.
Transaction_Data/
              ---Customer1/
                          --- day1
                          --- day2
                          .
                          --- dayN
              ---Customer2/
                          --- day1
                          --- day2
                          .
                          --- dayN
             ---CustomerN/
                          --- day1
                          --- day2
                          .
                          --- dayN


Lets assume these are clean data and each customer is like an individual data frame (days represent rows).
I want to load these data in batches (probably 5 customers at once - can fit into memory) and train DL model using torch. What is the efficient way to load these?
Thank you very much in advance!