docker folder doesn't exist for pretrain

[usuyama]

docker folder for docker file and instruction to use Azure Container Registry

https://github.com/microsoft/AzureML-BERT/blob/master/pretrain/PyTorch/README.md

It seems the custom image is not needed from this commit d49e7cd , but would be great to know which Dockerfile was used for creating the public image.

@aashnamsft

[usuyama]

From the name, this (https://github.com/Azure/AzureML-Containers/blob/master/base/gpu/openmpi3.1.2-cuda10.0-cudnn7-ubuntu16.04/Dockerfile ) looks like the base image; however, it seems there're additional steps for the AzureML-BERT image.

Still looking for the Dockerfile.