Add deprecation warning in script

pmc_open_access.py

@@ -15,6 +15,7 @@
 """PMC Open Access Subset."""
 
 import datetime
+import warnings
 
 import pandas as pd
 
@@ -85,6 +86,10 @@ class PmcOpenAccess(datasets.GeneratorBasedBuilder):
     DEFAULT_CONFIG_NAME = "all"
 
     def _info(self):
+        warnings.warn(
+            "Dataset 'pmc_open_access' is deprecated and will be deleted. Use 'pmc/open_access' instead.",
+            FutureWarning,
+        )
         return datasets.DatasetInfo(
             description=_DESCRIPTION,
             features=datasets.Features(