unique keys

pubchem_selfies.py

@@ -16,6 +16,7 @@
 import json
 import glob
 import gzip
+import os
 
 import datasets
 
@@ -473,9 +474,10 @@ class PubchemSelfies(datasets.GeneratorBasedBuilder):
         # The `key` is for legacy reasons (tfds) and is not important in itself, but must be unique for each example.
         for filepath in subdirs:
             with gzip.open(open(filepath, "rb"), "rt", encoding="utf-8") as f:
-                for key, row in enumerate(f):
+                for row_idx, row in enumerate(f):
                     data = json.loads(row)
                     properties = data["molecules"][0]["properties"]
+                    key = f"{os.path.basename(filepath)}_{row_idx}"
                     yield key, {
                         "PUBCHEM_COMPOUND_CID": properties["PUBCHEM_COMPOUND_CID"],
                         "PUBCHEM_OPENEYE_CAN_SMILES": properties[