code: def evaluate(data_path: str) -> None:
      """
      Evaluate the performance of an existing machine learning model
      """
      Igel(cmd="evaluate", data_path=data_path)
  
imports: import logging
  import os
  import subprocess
  from pathlib import Path
  import click
  import igel
  import pandas
  from igel import Igel, metrics_dict
  from igel.constants import Constants
  from igel.servers import fastapi_server
  from igel.utils import print_models_overview, show_model_info, tableize
label_desc: Use image node_id 4 for calling a global function with example usage: evaluate(data_path) without return types