Can't pickle weakref objects

I am going to build my project and data is fetched from my database with specific Project_id. and then train my model using LSTM. Epochs are clearly running but after that, It shows an Internal Server Error


admin.py

 def build(self, request, queryset):
        count = 0

        for p in queryset:
            if build_id(p.project_management.id):
                count += 1
            else:
                messages.warning(request, f"Could not build model for {p}")

        messages.success(
            request, f"Successfully built models for {count} projects")

    build.short_description = "Build models for selected Projects"

bild.py
here the model is built via a specific Project_id. Model store only model.pkl data but not completed. And other files scalar_in and scalar_out do not save in a specific folder.

def build_id(project_id):
    # get directory path to store models in
    path = fetch_model_path(project_id, True)

    # train model
    model, scaler_in, scaler_out = train_project_models(project_id)

    # ensure model was trained
    if model is None:
        return False

    # store models
    store_model(f'{path}/model.pkl', model)
    store_model(f'{path}/scaler_in.pkl', scaler_in)
    store_model(f'{path}/scaler_out.pkl', scaler_out)

    # clear current loaded model from memory
    keras_clear()

    return True

utils.py

    with open(path, 'wb') as f:
        model_file = File(f)
        pickle.dump(model, model_file)

when I Comment on the pickle.dump(model,model_file) then model.pkl, scalar_in.pkl, and scalar_out.pkl save files with 0 kb data. If pkl files exist already with data then it removes and builds the project successfully. I debug this code and the Django debuger_tool shows that the page is temporarily moved.


output

Epoch 1/4
11/11 [==============================] - 9s 302ms/step - loss: 0.4594 - val_loss: 0.2777
Epoch 2/4
11/11 [==============================] - 2s 177ms/step - loss: 0.1039 - val_loss: 0.0395
Epoch 3/4
11/11 [==============================] - 2s 170ms/step - loss: 0.0545 - val_loss: 0.0361
Epoch 4/4
11/11 [==============================] - 2s 169ms/step - loss: 0.0414 - val_loss: 0.0551
Internal Server Error: /turboai/turboAI/jaaiparameters/
Traceback (most recent call last):
  File "E:\.Space\project\venv\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
    response = get_response(request)
  File "E:\.Space\project\venv\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "E:\.Space\project\venv\lib\site-packages\django\contrib\admin\options.py", line 616, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "E:\.Space\project\venv\lib\site-packages\django\utils\decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "E:\.Space\project\venv\lib\site-packages\django\views\decorators\cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "E:\.Space\project\venv\lib\site-packages\django\contrib\admin\sites.py", line 232, in inner
    return view(request, *args, **kwargs)
  File "E:\.Space\project\venv\lib\site-packages\django\utils\decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "E:\.Space\project\venv\lib\site-packages\django\utils\decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "E:\.Space\project\venv\lib\site-packages\django\contrib\admin\options.py", line 1723, in changelist_view
    response = self.response_action(request, queryset=cl.get_queryset(request))
  File "E:\.Space\project\venv\lib\site-packages\django\contrib\admin\options.py", line 1408, in response_action
    response = func(self, request, queryset)
  File "E:\.Space\project\TurboAnchor\turboAI\admin.py", line 125, in build
    if build_id(p.project_management.id):
  File "E:\.Space\project\TurboAnchor\turboAI\build.py", line 48, in build_id
    store_model(f'{path}/model.pkl', model)
  File "E:\.Space\project\TurboAnchor\turboAI\utils.py", line 154, in store_model
    pickle.dump(model, model_file)
TypeError: can't pickle weakref objects
[29/Oct/2021 17:50:31] "POST /turboai/turboAI/jaaiparameters/ HTTP/1.1" 500 126722

Please look at:

I suggest to test this with TF 2.6.x or TF 2.7rc