Update marker/markdown_extractor.py

marker/markdown_extractor.py

@@ -33,4 +33,7 @@ class MarkdownExtractor(Extractor):
             feature = Feature.metadata(value=out_meta, name="text")
             contents.append(Content.from_text(full_text, features=[feature]))
 
-        return contents
+        return contents
+
+    def sample_input(self) -> Content:
+        return self.sample_scientific_pdf()