Question about comparative experiment

[hrtan]

Hello

ConvCRF is an amazing work.

I have a question about the experiment on ConvCRF and CRFasRNN. In general, DenseCRF can increase MIoU by 3%, Which means that even without end-to-end jointly fine tuning, the CNN-DenseCRF system can achieve a better MIoU than the unary (CNN). But I notice that in this paper, MIoU of FCN-ResNet101-CRFasRNN is about 69, lower than the raw MIoU of its unary module FCN-ResNet101 (about 71).

What happends to DenseCRF that makes its accuracy declining so hard?