See how to use the images in CNTK Wiki.
The following tags default to images based on ubuntu:16.04 (CPU) and nvidia/cuda:9.0-runtime-ubuntu16.04 (v.2.x GPU).
GPU (NVIDIA Docker is required)
2.5-rc0.dev{yyyyMMdd}-gpu-python3.5-cuda9.0-cudnn7.0
,latest
(/ubuntu-16.04/version_2/gpu/runtime/python-3/Dockerfile)
CPU
2.5-rc0.dev{yyyyMMdd}-cpu-python3.5
(/ubuntu-16.04/version_2/cpu/runtime/python-3/Dockerfile)
GPU (NVIDIA Docker is required)
2.5-rc0.dev{yyyyMMdd}-gpu-python2.7-cuda9.0-cudnn7.0
(/ubuntu-16.04/version_2/gpu/runtime/python-2/Dockerfile)
CPU
2.5-rc0.dev{yyyyMMdd}-cpu-python2.7
(/ubuntu-16.04/version_2/cpu/runtime/python-2/Dockerfile)