text: (depth is a tuple/list of integers) With the same input above, and if depth=(2, 3) the output will be a list of 4 string tensors: [[b'1_X_2'], [b'4_X_5']], [[b'2_X_3'], [b'5_X_6']], [[b'3_X_1'], [b'6_X_4']], [[b'1_X_2_X_3'], [b'4_X_5_X_6']]