Update hc4-corpus.py

hc4-corpus.py

@@ -34,6 +34,8 @@ _CITATION = '''
 }
 '''
 
+# Note: this dataset requires to download HC4 collection based on the requirement of ir-datasets
+
 import ir_datasets
 
 
@@ -93,4 +95,4 @@ class BeirCorpus(datasets.GeneratorBasedBuilder):
 
         dataset = ir_datasets.load(f'hc4/{lang}')
         for doc in dataset.docs_iter():
-              yield doc.docid, {'docid': doc.docid, 'title': doc.title, 'url': doc.url}
+              yield doc.doc_id, {'docid': doc.docid, 'title': doc.title, 'url': doc.url}