code: def test_sammon_circle() -> None:
      func = problems.SammonMapping.from_2d_circle().copy()
      assert np.max(func._proximity) <= 2.0
  
file_path: nevergrad/nevergrad/functions/mlda/test_problems.py
imports: from unittest.mock import patch
  import numpy
  import pandas
  from ...common import testing
  from .None import problems
label_desc: Use image node_id 6 for calling a global function with example usage: test_sammon_circle() without return types