Update pubchem_selfies.py

pubchem_selfies.py

@@ -473,7 +473,7 @@ 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(rows):
+                for key, row in enumerate(f):
                     data = json.loads(row)
                     properties = data["molecules"][0]["properties"]
                     yield key, {