Update pdf/pdf_extractor.py

pdf/pdf_extractor.py

@@ -49,4 +49,7 @@ class PDFExtractor(Extractor):
                     feature = Feature.metadata({"type": "table", "page": int(page)})
                     contents.append(Content(content_type="application/json", data=json.dumps(content), features=[feature]))
 
-        return contents
+        return contents
+
+    def sample_input(self) -> Content:
+        return self.sample_scientific_pdf()