Fix inference: write class id as int.

tools/test_generate_result_pre-consensus.py

@@ -221,7 +221,7 @@ def main():
                     class_id = -1
                     dropped += 1
             total += 1
-            f.write(f'{obs_id},{float(class_id):.1f}\n')
+            f.write(f'{obs_id},{int(class_id):.1f}\n')
 
     print(f'dropped {dropped} out of {total}')