How to pip install ray or spark extra using a Git URL

[touma-I]

In the new release, all the transforms and library are delivered as a single package with extra for dev, ray, spark, and later on for kfp. In almost all cases, users should install from pypi. Another, although unsupported method, developers can use a git URL to do the same. The following below to install the ray extra for the latest release.
pip install 'data-prep-toolkit[ray] @ git+https://github.com/IBM/data-prep-kit.git#subdirectory=data-processing-lib/'

or using a requirements.txt file with the following line to do the same:
data-prep-toolkit[ray] @ git+https://github.com/IBM/data-prep-kit.git#subdirectory=data-processing-lib/

This approach does not currently work for the transforms as they currently follow a flat structure.