code: def cigar(x: np.ndarray) -> float:
      """Classical example of ill conditioned function.
  
      The other classical example is ellipsoid.
      """
      return float(x[0]) ** 2 + 1000000.0 * sphere(x[1:])
  
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 10 for calling a global function with example usage: cigar(x) and returns: unknown