class_docstr: The pseudo-Huber penalty.
class_docstr_tok: ["The","pseudo-Huber","penalty","."]
code: def deriv2(self, params):
      v = np.power(1 + (params / self.dlt) ** 2, -3 / 2)
      return self.weights * self.alpha * v
  
imports: import numpy
label_desc: Use image node_id 4 for calling the PseudoHuber obj's underlying member method code with example usage: obj.deriv2(params) and returns: unknown