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test.py

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+import os
+
+def count_pdfs_in_dir(root_dir):
+    pdf_count = 0
+    for dirpath, dirnames, filenames in os.walk(root_dir):
+        for filename in filenames:
+            if filename.lower().endswith('.pdf'):
+                pdf_count += 1
+    return pdf_count
+
+if __name__ == "__main__":
+    dataset_path = './nature_papers'
+    total_pdfs = count_pdfs_in_dir(dataset_path)
+    print(f"Total number of PDF files in '{dataset_path}': {total_pdfs}")