code: def deceptiveillcond(x: np.ndarray) -> float:
      """An extreme ill conditioned functions. Most algorithms fail on this.
  
      The condition number increases to infinity as we get closer to the optimum.
      """
      assert len(x) >= 2
      return float(
          max(
              np.abs(np.arctan(x[1] / x[0])),
              np.sqrt(x[0] ** 2.0 + x[1] ** 2.0),
              1.0 if x[0] > 0 else 0.0,
          )
          if x[0] != 0.0
          else float("inf")
      )
  
imports: from math import exp, sqrt, tanh
  import numpy
  import nevergrad.common.typing
  from nevergrad.common.decorators import Registry
label_desc: Use image node_id 26 for calling a global function with example usage: deceptiveillcond(x) and returns: float