What are up_feat layers used for in class PWCDCNet class?

NVlabs / PWC-Net

PWC-Net: CNNs for Optical Flow Using Pyramid, Warping, and Cost Volume, CVPR 2018 (Oral)

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What are up_feat layers used for in class PWCDCNet class? #102

Open GtxMiracle opened 4 years ago

GtxMiracle commented 4 years ago

In line 204 of PWCNet.py, a up_feat layer is used for transforming the last feature x of optical flow estimator module into a 2 channels feature map. What does this mean? I couldn't find the corresponding function in the paper.