About the args of vq_option

[hu394854434]

I see in the code in "data/t2m_dataset.py/Motiondataset", in the init func.
Why do that?

        if opt.is_train:
            # root_rot_velocity (B, seq_len, 1)
            std[0:1] = std[0:1] / opt.feat_bias
            # root_linear_velocity (B, seq_len, 2)
            std[1:3] = std[1:3] / opt.feat_bias
            # root_y (B, seq_len, 1)
            std[3:4] = std[3:4] / opt.feat_bias

what is opt.feat_bias for?