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The readme for gtdb dataset states-
Chardata
denote the characters or symbols.1:Chardata, 2:Character ID, 3-6:Coordinates of the bounding box (left, top, right, bottom), 7:Text Mode (0:Ordinary text, 1:Math symbol), 8:Link label, 9:ID of parent character, 10:OCR code
earlier- if int (rcd[7]) == 1 : was checking the link label
To check for Math_symbol it should check in 6th index i.e. the 7th element " if int (rcd[6]) == 1 :"