download and return R dataset
Parameters: | dataname : str
package : str
cache : bool or str
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Returns: | dataset : Dataset instance
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Notes
If the R dataset has an integer index. This is reset to be zero-based. Otherwise the index is preserved. The caching facilities are dumb. That is, no download dates, e-tags, or otherwise identifying information is checked to see if the data should be downloaded again or not. If the dataset is in the cache, it’s used.