Omkar2118/datasets huggingface dataset:
Signal-1M

The Signal Media One-Million News Articles Dataset dataset by Signal Media was released to facilitate researching news articles. It can be used for submissions to the NewsIR'16 workshop, but it is intended to serve the community for research on news retrieval in general.
AskUbuntu

AskUbuntu question dataset is a preprocessed collection of questions taken from the AskUbuntu.com 2014 corpus dump. It also comes with 400*20 manual annotations, marking pairs of questions as "similar" or "non-similar".