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data in that example is read from this csv file , which has letters for labels in the 1st column.

subtracting 'A' from those makes 0-based labels again, since: 'A' - 'A' = 0, 'B' - 'A' = 1, 'C' - 'A' = 2, etc.

data in that example is read from this csv file , which has letters for labels in the 1st column.

subtracting 'A' from those makes 0-based labels again, since:

'A' - 'A' = 0, 'B' - 'A' = 1, 'C' - 'A' = 2, etc.