fix: the exception not using default topk argument

inference.py

@@ -119,8 +119,8 @@ def main():
     with open(os.path.join(args.output_dir, './topk_ids.csv'), 'w') as out_file:
         filenames = loader.dataset.filenames(basename=True)
         for filename, label in zip(filenames, topk_ids):
-            out_file.write('{0},{1},{2},{3},{4},{5}\n'.format(
-                filename, label[0], label[1], label[2], label[3], label[4]))
+            out_file.write('{0},{1}\n'.format(
+                filename, ','.join([ str(v) for v in label])))
 
 
 if __name__ == '__main__':