What is the default weight mean?

[BebDong]

SegmenTron/segmentron/solver/loss.py

Line 79 in 4bc605e

weight = torch.FloatTensor([0.8373, 0.918, 0.866, 1.0345, 1.0166, 0.9969, 0.9754,

What is the default weight value mean and how did you get it?