[modeller_usage] help--model-segment.py

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Hi:
  I want to use a part structure of template which belongs GPCR family. I write
'model-segment.py' scripts to model, the following is the scripts:

from modeller import *
log.verbose()
class mymodel(automodel):
  def selection_atoms(self):
      self.pick_atoms(selection_segment=('37:A','63:A'),
                      selection_search='segment',pick_atoms_set=1,
                      res_types='all',atom_types='all',
                      selection_from='all',selection_status='initialize')
      self.pick_atoms(selection_segment=('74:A','96:A'),
                      selection_search='segment',pick_atoms_set=2,
                      res_types='all',atom_types='all',
                      selection_from='all',selection_status='initialize')
      self.pick_atoms(selection_segment=('111:A','133:A'),
                      selection_search='segment',pick_atoms_set=3,
                      res_types='all',atom_types='all',
                      selection_from='all',selection_status='initialize')
      self.pick_atoms(selection_segment=('153:A','173:A'),
                      selection_search='segment',pick_atoms_set=4,
                      res_types='all',atom_types='all',
                      selection_from='all',selection_status='initialize')
      self.pick_atoms(selection_segment=('203:A','224:A'),
                      selection_search='segment',pick_atoms_set=5,
                      res_types='all',atom_types='all',
                      selection_from='all',selection_status='initialize')
      self.pick_atoms(selection_segment=('250:A','274:A'),
                      selection_search='segment',pick_atoms_set=6,
                      res_types='all',atom_types='all',
                      selection_from='all',selection_status='initialize')
      self.pick_atoms(selection_segment=('287:A','308:A'),
                      selection_search='segment',pick_atoms_set=7,
                      res_types='all',atom_types='all',
                      selection_from='all',selection_status='initialize')
env=environ()
env.io.atom_files_directory='./:../atom_files'
env.edat.nonbonded_sel_atoms=2
a=mymodel(env,
          alnfile='1u19-tm.ali',
	  knows='1u19',
	  sequence='mrg-tm')
a.starting_model=1
a.ending_model=1
a.make()  

But when I run the mod9v1, there appears some errors:
Traceback (most recent call last):
  File "model-segment.py", line 3, in ?
    class mymodel(automodel):
NameError: name 'automodel' is not define
How to define the 'automodel', please?
thanks a lot!!