Hi,
this week’s release of datasets will add support for directly pushing a Dataset/DatasetDict object to the Hub. In the meantime, you can use a to_{format} method, where format is one of ["csv", "json", "txt", "parquet"] on each split of the DatasetDict object and push the generated files to the Hub (follow the docs here 1 for more information). Also note that this requires the master version of the library, which you can install with:
pip install git+https://github.com/huggingface/datasets.git

Without the master version, you’ll have to specify a list of files to load each split separately (docs on that are here 1).