pre work
apex is need, and install it as follows:
$ git clone https://github.com/NVIDIA/apex
$ cd apex
$ pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" ./
$ cd ..
$ rm apexjupyter
conda install nb_conda --yes
conda install -c conda-forge jupyter_contrib_nbextensions --yes
history
2019-11-23 start paper
2019-10-9 add U-Net
2019-9-22 amp distributed
2019-9-19 auto-reset-lr