fix loading script

protein_ligand_contacts.py

@@ -81,6 +81,7 @@ class ProteinLigandContacts(datasets.ArrowBasedBuilder):
                 "contacts_5A": datasets.Sequence(datasets.Value('int64')),
                 "contacts_8A": datasets.Sequence(datasets.Value('int64')),
                 "contacts_11A": datasets.Sequence(datasets.Value('int64')),
+                "contacts_15A": datasets.Sequence(datasets.Value('int64')),
                 # These are the features of your dataset like images, labels ...
             }
         )