PyTorch Docker Env

Location of Python is /opt/conda/bin/python,

Features

By default a docker conatiner only has 48 MB shared memory. To use multi-processes, (for instance, multiple works in PyTroch dataloader), set shm_size: '64gb' in the docker-compose serveice.
A known bug bewteen docker-compose and PyCharm is that the latest docker-compose installed from Docker official channel cannot received signals from PyCharm so that the running container can not be stopped.
- As suggested in the youtrack issue, install docker-compose from pip by sudo will overwrite the official docker-compose and the pip one actually works with PyCharm for unknown reason.
- It can be achieved as follows:
```
docker-compose --version
docker-compose version 1.27.4, build 40524192
sudo pip3 install docker-compose
docker-compose -v
docker-compose version 1.29.2, build unknown
```