code: def diff(base_df, test_csv):
      base_models = base_df["model"].values
      test_df = pd.read_csv(test_csv)
      test_models = test_df["model"].values
  
      rank_diff = np.zeros_like(test_models, dtype="object")
      top1_diff = np.zeros_like(test_models, dtype="object")
      top5_diff = np.zeros_like(test_models, dtype="object")
  
      for rank, model in enumerate(test_models):
          if model in base_models:
              base_rank = int(np.where(base_models == model)[0])
              top1_d = (
                  test_df["top1"][rank] - base_df["top1"][base_rank]
              )
              top5_d = (
                  test_df["top5"][rank] - base_df["top5"][base_rank]
              )
  
              # rank_diff
              if rank == base_rank:
                  rank_diff[rank] = f"0"
              elif rank > base_rank:
                  rank_diff[rank] = f"-{rank - base_rank}"
              else:
                  rank_diff[rank] = f"+{base_rank - rank}"
  
              # top1_diff
              if top1_d >= 0.0:
                  top1_diff[rank] = f"+{top1_d:.3f}"
              else:
                  top1_diff[rank] = f"-{abs(top1_d):.3f}"
  
              # top5_diff
              if top5_d >= 0.0:
                  top5_diff[rank] = f"+{top5_d:.3f}"
              else:
                  top5_diff[rank] = f"-{abs(top5_d):.3f}"
  
          else:
              rank_diff[rank] = ""
              top1_diff[rank] = ""
              top5_diff[rank] = ""
  
      test_df["top1_diff"] = top1_diff
      test_df["top5_diff"] = top5_diff
      test_df["rank_diff"] = rank_diff
  
      test_df["param_count"] = test_df["param_count"].map(
          "{:,.2f}".format
      )
      test_df.sort_values(
          ["top1", "top5", "model"],
          ascending=[False, False, True],
          inplace=True,
      )
      test_df.to_csv(test_csv, index=False, float_format="%.3f")
  
label_desc: Use image node_id 1 for calling a global function with example usage: diff(base_df, test_csv) without return types