Notebook for "Running the Demo App" fails

[Baschdl]

Description

Following the "Running the Demo App" description, I get the following error in the "01-Create-plan" notebook in execution cell 7:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-7-c3dd000bb342> in <module>
      6 batch_size = th.tensor([3.0])
      7 
----> 8 _ = training_plan.build(X, y, batch_size, lr, model_params, trace_autograd=True)

PyGrid/venv/lib/python3.8/site-packages/syft/execution/plan.py in build(self, trace_autograd, *args)
    271                 framework_kwargs[f_name] = wrap_framework_func(self.role)
    272 
--> 273         results = self.forward(*args, **framework_kwargs)
    274 
    275         # Register inputs in role

<ipython-input-6-fa8d649c2603> in training_plan(X, y, batch_size, lr, model_params)
      5 
      6     # forward pass
----> 7     logits = model.forward(X)
      8 
      9     # loss

<ipython-input-3-e527d4aba9da> in forward(self, x)
      6 
      7     def forward(self, x):
----> 8         x = self.fc1(x)
      9         x = nn.functional.relu(x)
     10         x = self.fc2(x)

PyGrid/venv/lib/python3.8/site-packages/torch/nn/modules/module.py in _call_impl(self, *input, **kwargs)
    720             result = self._slow_forward(*input, **kwargs)
    721         else:
--> 722             result = self.forward(*input, **kwargs)
    723         for hook in itertools.chain(
    724                 _global_forward_hooks.values(),

PyGrid/venv/lib/python3.8/site-packages/torch/nn/modules/linear.py in forward(self, input)
     89 
     90     def forward(self, input: Tensor) -> Tensor:
---> 91         return F.linear(input, self.weight, self.bias)
     92 
     93     def extra_repr(self) -> str:

PyGrid/venv/lib/python3.8/site-packages/syft/generic/frameworks/hook/hook.py in overloaded_func(*args, **kwargs)
    333                 handle_func_command = syft.framework.Tensor.handle_func_command
    334 
--> 335             response = handle_func_command(command)
    336 
    337             return response

PyGrid/venv/lib/python3.8/site-packages/syft/frameworks/torch/tensors/interpreters/autograd.py in handle_func_command(cls, command)
    292 
    293         if cmd is not None:
--> 294             return cmd(*args_, **kwargs_)
    295 
    296         # Replace all AutogradTensor with their child attribute

PyGrid/venv/lib/python3.8/site-packages/syft/frameworks/torch/tensors/interpreters/autograd.py in linear(*args)
    252                     Un-hook the function to have its detailed behaviour
    253                     """
--> 254                     return torch.nn.functional.native_linear(*args)
    255 
    256                 module.linear = linear

PyGrid/venv/lib/python3.8/site-packages/torch/nn/functional.py in linear(input, weight, bias)
   1668     tens_ops = (input, weight)
   1669     if not torch.jit.is_scripting():
-> 1670         if any([type(t) is not Tensor for t in tens_ops]) and has_torch_function(tens_ops):
   1671             return handle_torch_function(linear, tens_ops, input, weight, bias=bias)
   1672     if input.dim() == 2 and bias is not None:

PyGrid/venv/lib/python3.8/site-packages/syft/generic/frameworks/hook/hook.py in overloaded_func(*args, **kwargs)
    333                 handle_func_command = syft.framework.Tensor.handle_func_command
    334 
--> 335             response = handle_func_command(command)
    336 
    337             return response

PyGrid/venv/lib/python3.8/site-packages/syft/frameworks/torch/tensors/interpreters/autograd.py in handle_func_command(cls, command)
    303 
    304         # Send it to the appropriate class and get the response
--> 305         response = new_type.handle_func_command(new_command)
    306 
    307         # Put back AutogradTensor on the tensors found in the response

PyGrid/venv/lib/python3.8/site-packages/syft/execution/placeholder.py in handle_func_command(cls, command)
     77                 template_placeholder = arg
     78 
---> 79         placeholders = PlaceHolder.convert_to_placeholders(response, template_placeholder)
     80 
     81         if template_placeholder.tracing:

PyGrid/venv/lib/python3.8/site-packages/syft/execution/placeholder.py in convert_to_placeholders(response, template_placeholder)
     99         else:
    100             placeholders = PlaceHolder.create_from(
--> 101                 response, role=template_placeholder.role, tracing=template_placeholder.tracing
    102             )
    103 

AttributeError: 'NoneType' object has no attribute 'role'

System Information

• OS: macOS 10.15.6
• Language Version: Python 3.8.5
• Package Manager Version: pip 20.1.1