How many characters does ch_ptocr_v2_rec_infer model support?

[memofemanon]

Hi,
I am checking how many Chinese characters ch_ptocr_v2_rec_infer supports and what are they. I noticed that the final layer of the model has 6625 channels, while there are only 6623 characters in the dictionary file ppocr_keys_v1.txt.
If I consider the blank, there is still 1 class missing, what is that?

[tink2123]

Yes ppocr_keys_v1.txt supports 6623 characters， the final layer of the model has 6625 channels because of the CTC needs an extra meaningless link characters " - ".