          self.style = {} if style is None else style
          self.allow_null = allow_null
  
          # These are set up by `.bind()` when the field is added to a serializer.
          self.field_name = None
          self.parent = None
  
 
</s> remove         self.validators = validators[:] or self.default_validators[:]
 </s> add  </s> remove         self.fields = BindingDict(self)
        for key, value in self._get_base_fields().items():
            self.fields[key] = value

        self.validators = getattr(getattr(self, 'Meta', None), 'validators', [])

    def _get_base_fields(self):
 </s> add  </s> remove     def __init__(self, *args, **kwargs):
        super(Serializer, self).__init__(*args, **kwargs)

 </s> add     @property
    def fields(self):
        if not hasattr(self, '_fields'):
            self._fields = BindingDict(self)
            for key, value in self.get_fields().items():
                self._fields[key] = value
        return self._fields

    def get_fields(self): </s> remove     def __init__(self, *args, **kwargs):
        super(ModelSerializer, self).__init__(*args, **kwargs)
        if 'validators' not in kwargs:
            validators = self.get_default_validators()
            if validators:
                self.validators.extend(validators)
                self._kwargs['validators'] = validators

 </s> add 
        if validators is not None:
            self.validators = validators[:]

          self.style = {} if style is None else style
          self.allow_null = allow_null
  
        if validators is not None:
            self.validators = validators[:]

          # These are set up by `.bind()` when the field is added to a serializer.
          self.field_name = None
          self.parent = None
  
keep keep add keep keep keep keep
 Lazy loading of fields and validators. Closes #1963. 
rest_framework/fields.py