code: def pareto_by_task_tooltip(row: pd.Series) -> str:
      """For one row of a dataframe, computes a tooltip description.
  
      Args:
        row: A Pandas Series, one row of a dataframe containing some specific
          cumulative sum columns.
  
      Returns:
        A string to show as the tooltip for a pareto curve.
      """
      return (
          f"{row['task cumsum order'] * 100:.2f}% of regions "
          f"account for {row['task cumsum fraction'] * 100:.2f}% of "
          f"the runtime in task {row['Task']}"
      )
  
imports: from typing import Dict, Sequence, List, Tuple, Text, Union
  from absl import app
  from absl import flags
  import altair
  import pandas
  import tensorflow
  from third_party.nucleus.io import sharded_file_utils
  from deepvariant import dashboard_utils
label_desc: Use image node_id 8 for calling a global function with example usage: pareto_by_task_tooltip(row) and returns: unknown, str, unknown, str, row