<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _init_composite_fields(self):
 """ Setup the forms and formsets. """

        # The base_composite_fields class attribute is the *class-wide*
        # definition of fields. Because a particular *instance* of the class
        # might want to alter self.composite_fields, we create
        # self.composite_fields here by copying base_composite_fields.
        # Instances should always modify self.composite_fields; they should not
        # modify base_composite_fields.
        self.composite_fields = copy.deepcopy(self.base_composite_fields)
        self.forms = OrderedDict()
        self.formsets = OrderedDict()
        for name, field in self.composite_fields.items():
            self._init_composite_field(name, field)