code: def from_binary(cls, pst, filename):
          
          m = Matrix.from_binary(filename).to_dataframe()
  
          return ParameterEnsemble.from_dataframe(df=m, pst=pst)
docs: instantiate an parameter obsemble from a jco-type file
  
          Parameters
          ----------
          pst : pyemu.Pst
              a Pst instance
          filename : str
              the binary file name
  
          Returns
          -------
          pe : ParameterEnsemble