## load_pkg_chemical_hierarchy()


Load chemical class hierarchy from a TSV file.


Usage

``` python
load_pkg_chemical_hierarchy(file_path="scratch/wikidata_classes_taxonomy.tsv")
```


The file should have at least 3 columns, where: - Column 2 (index 1): Class URI - Column 3 (index 2): Parent URI


## Parameters


`file_path: str | Path = ``"scratch/wikidata_classes_taxonomy.tsv"`  
Default is 'scratch/wikidata_classes_taxonomy.tsv'.


## Returns


`dict[str, list[str]]`  
URIs.


## Raises


`DataLoadingError`  
If the file cannot be read or parsed.