AttributeError: 'NoneType' object has no attribute 'parent' when implementig kd framework for mmfewshot about mmrazor HOT 5 CLOSED

# Copyright (c) OpenMMLab. All rights reserved.
from mmcv.cnn import MODELS
from mmcv.runner import BaseModule


class BaseArchitecture(BaseModule):
    """Base class for architecture.

    Args:
        model (:obj:`torch.nn.Module`): Model to be slimmed, such as
            ``DETECTOR`` in MMDetection.
    """

    def __init__(self, model, **kwargs):
        super(BaseArchitecture, self).__init__(**kwargs)
        #### modification code
        if isinstance(model,dict):
            self.model = MODELS.build(model)
        else:
            self.model = model
        

# Copyright (c) OpenMMLab. All rights reserved.
from mmrazor.models.builder import ARCHITECTURES
from mmfewshot.detection.models.builder import build_detector

@ARCHITECTURES.register_module()
class MMFewShotArchitecture(BaseArchitecture):
    """Architecture based on MMFewShot."""

    def __init__(self,**kwargs):

        #### This is for student model

        model = build_detector(kwargs["model"])
        super(MMFewShotArchitecture, self).__init__(model)

model = dict(
 type='TFA',
………………

from mmfewshot.detection.models import build_detector
@DISTILLERS.register_module()
class SingleTeacherDistiller(BaseDistiller):
    def __init__(self,
                 teacher,
                 teacher_trainable=False,
                 teacher_norm_eval=True,
                 components=tuple(),
                 **kwargs):
        super().__init__(**kwargs)
        self.teacher = self.build_teacher(teacher)
    def build_teacher(self, cfg):

       ###This is for teacher model

        """Build a model from the `cfg`."""
        teacher = build_detector(cfg)
        return teacher