code: def step(s: float) -> float:
      if s == 0.0:
          s = np.nextafter(0.0, 1.0)
      return float(np.exp(int(np.log(s))))
  
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 14 for calling a global function with example usage: step(s) and returns: float