code: def smooth_lowess(
      array: np.ndarray, frac: float, it: int, delta: float
  ) -> np.ndarray:
      return sm.nonparametric.lowess(
          array,
          np.linspace(0, 1, len(array)),
          frac=frac,
          it=it,
          delta=delta,
      )[:, 1]
  
imports: import numpy
  import statsmodels.api
label_desc: Use image node_id 15 for calling a global function with example usage: smooth_lowess(array, frac, it, delta) and returns: sm