update docs and wbceloss function

bob/ip/binseg/configs/models/driu.py

bob/ip/binseg/configs/models/driuj01.py

bob/ip/binseg/configs/models/hed.py

bob/ip/binseg/configs/models/m2unet.py

bob/ip/binseg/configs/models/m2unetj01.py

bob/ip/binseg/configs/models/resunet.py

bob/ip/binseg/configs/models/resunetj01.py

bob/ip/binseg/configs/models/unet.py

bob/ip/binseg/configs/models/unetj01.py

bob/ip/binseg/data/__init__.py

bob/ip/binseg/data/binsegdataset.py

bob/ip/binseg/data/transforms.py

bob/ip/binseg/engine/adabound.py

bob/ip/binseg/engine/inferencer.py

bob/ip/binseg/engine/trainer.py

bob/ip/binseg/modeling/driu.py

bob/ip/binseg/modeling/hed.py

bob/ip/binseg/modeling/losses.py

bob/ip/binseg/modeling/m2u.py

bob/ip/binseg/modeling/make_layers.py