Why the `nyu40id2class` of Scan2Cap is different with that of these detection methods?

[linhaojia13]

## VoteNet
(Pdb) DC18.nyu40id2class
{3: 0, 4: 1, 5: 2, 6: 3, 7: 4, 8: 5, 9: 6, 10: 7, 11: 8, 12: 9, 14: 10, 16: 11, 24: 12, 28: 13, 33: 14, 34: 15, 36: 16, 39: 17}
(Pdb) len(DC18.nyu40id2class)
18
(Pdb) 

## Scan2Cap
(Pdb) self.dataset_config.nyu40id2class
{5: 2, 23: 17, 8: 5, 40: 17, 9: 6, 7: 4, 39: 17, 18: 17, 11: 8, 29: 17, 3: 0, 14: 10, 15: 17, 27: 17, 6: 3, 34: 15, 35: 17, 4: 1, 10: 7, 19: 17, 16: 11, 30: 17, 33: 14, 37: 17, 21: 17, 32: 17, 25: 17, 17: 17, 24: 12, 28: 13, 36: 16, 12: 9, 38: 17, 20: 17, 26: 17, 31: 17, 13: 17}
(Pdb) len(self.dataset_config.nyu40id2class)
37
(Pdb)