problem of train.py

[kkhuang1990]

In line 223 of train.py file. input and target should be both out[0] and label[0] if we want to use data after multi-scale fusion for training.

[kkhuang1990]

Also for esize_label_batch() function in train.py, instead of UpsamplingBilinear2d but UpsamplingNearest2d should be used for resizing labels since labels can only be integer, converting float to int may cause mis-labeling for ground truth labels