The PR 1 is the overview of the version inside the DLCs. Meaning the container you use when running huggingface_estimator.fit(). In the notebook, you can install every version you want, but it makes most of the time sense to use the same version as you will in the HuggingFace estimator.
Thanks for finding the pip installation it should be datasets[s3] to make sure we install the S3 utils to push our datasets to s3.