code: def ellipsoid(x: np.ndarray) -> float:
      """Classical example of ill conditioned function.
  
      The other classical example is cigar.
      """
      dim = x.size
      weights = 10 ** np.linspace(0, 6, dim)
      return float(weights.dot(x**2))
  
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 16 for calling a global function with example usage: ellipsoid(x) and returns: float