The parquet file is now a flat column layout, with all features as top-level columns. Add a sequence feature, rename feature names and update some features. Participants should refer to the updated demo_1000.parquet and this README.md for the latest schema and data details.

A sample dataset containing 1000 user-item interaction… See the full description on the dataset page: https://huggingface.co/datasets/yujian888/data_sample_1000.