Wandb + fastai + RCNN error

🐛 Bug

Describe the bug An error is raised (strack trace below) when training a rcnn model with fastai and wandb.

To Reproduce Train a RCNN model with fastai and the WandbCallback.

Expected behavior A clear and concise description of what you expected to happen.

Why is this happening I believe the RCNNCallback and the WandbCallback are in conflict somehow. This error does not happen if the WandbCallback is used or if efficientdet is used instead of rcnn.

Stack Trace

/usr/local/lib/python3.6/dist-packages/torch/nn/modules/module.py in _call_impl(self, *input, **kwargs)
    734                 else:
--> 735                     var = var[0]
    736             grad_fn = var.grad_fn

TypeError: 'ImageList' object does not support indexing
...

During handling of the above exception, another exception occurred:

/usr/local/lib/python3.6/dist-packages/fastcore/foundation.py in __getattr__(self, k)
    157         if self._component_attr_filter(k):
    158             attr = getattr(self,self._default,None)
--> 159             if attr is not None: return getattr(attr,k)
    160         raise AttributeError(k)
    161     def __dir__(self): return custom_dir(self,self._dir())

AttributeError: 'Learner' object has no attribute 'smooth_loss'

[FraPochetti]

I will make sure to take a look at it before tomorrow’s chat 😉

[FraPochetti]

Is it ok if I look into this one as well (before diving together into KeyPoint detection)? I see it is already assigned to you @lgvaz