Why set: 'upsample.upconv.weight': None in keypoint net?

[lilichu]

Why set 'upsample.upconv.weight': None? In this way we can not load upsample.upconv.weight when load ckpt. but why? thanks!

Detectron.pytorch/lib/modeling/keypoint_rcnn_heads.py

Line 70 in 8315af3

 'upsample.upconv.weight': None,  # 0: don't load from or save to checkpoint 

        if self.upsample_heatmap:
            blob_name = 'kps_score_lowres'
            detectron_weight_mapping.update({
                'upsample.upconv.weight': None,  # 0: don't load from or save to checkpoint
                'upsample.upconv.bias': None
})