code: def _call(self, m: int, x: np.ndarray) -> float:
      if m == 1:
          return np.sin(x * np.pi / 2.0)[:-1].prod()
  
      if m == self.n_objectives:
          return np.cos(x[0] * np.pi / 2.0)
  
      return np.sin(x * np.pi / 2.0)[
          : self.n_objectives - m
      ].prod() * np.cos(x[self.n_objectives - m] * np.pi / 2.0)
  
imports: import abc
  import numpy
label_desc: Use image node_id 1 for calling the ConcaveShapeFunction obj's underlying member method code with example usage: obj._call(m, x) and returns: unknown, np, np