[bot] Conversion to Parquet
The parquet-converter bot has created a version of this dataset in the Parquet format in the refs/convert/parquet branch.
What is Parquet?
Apache Parquet is a popular columnar storage format known for:
- reduced memory requirement,
- fast data retrieval and filtering,
- efficient storage.
This is what powers the dataset viewer on each dataset page and every dataset on the Hub can be accessed with the same code (you can use HF Datasets, ClickHouse, DuckDB, Pandas, PostgreSQL, or Polars, up to you).
You can learn more about the advantages associated with Parquet in the documentation.
How to access the Parquet version of the dataset?
You can access the Parquet version of the dataset by following this link: refs/convert/parquet
What if my dataset was already in Parquet?
When the dataset is already in Parquet format, the data are not converted and the files in refs/convert/parquet are links to the original files. This rule has an exception to ensure the dataset viewer API to stay fast: if the row group size of the original Parquet files is too big, new Parquet files are generated.
What should I do?
You don't need to do anything. The Parquet version of the dataset is available for you to use. Refer to the documentation for examples and code snippets on how to query the Parquet files with ClickHouse, DuckDB, Pandas or Polars.
If you have any questions or concerns, feel free to ask in the discussion below. You can also close the discussion if you don't have any questions.
Dear Professor,
My name is a graduate student from Wuhan, China. My research focuses on spectral unmixing. I noticed that your dataset matches my research direction perfectly. However, I find that only the mixed spectral data has been released, while the pure spectral data of the eight components is not publicly available.
Would you be kind enough to share the complete pure spectral data of these eight components with me? This dataset is crucial to my research and will largely determine the progress of my graduation work. I will duly cite your paper and dataset in my research publications.
You may reach me via my email: 2946118124@qq.com. I would highly appreciate your kind assistance and look forward to your reply.
Sincerely,
QianQian Li