code: def filter(self, arr):
      return (self * arr).coef[: -len(self.coef)]
  
file_path: statsmodels/statsmodels/examples/tsa/lagpolynomial.py
imports: import numpy
  from numpy import polynomial
label_desc: Use image node_id 5 for calling the LagPolynomial obj's underlying member method code with example usage: obj.filter(arr) and returns: unknown