'Learner' object has no attribute 'val_losses' in TrackerCallback

Part 1 (2019) Advanced (Part 1 v3)
1

Hello fastai fellows,

I am trying to re-run a notebook that was running successfully in September but now I am having an error in the TrackCallback:

‘Learner’ object has no attribute ‘val_losses’

This is the output of the command: fastai.utils.collect_env.show_install(1)

=== Software === 
python        : 3.6.9
fastai        : 1.0.59
fastprogress  : 0.1.22
torch         : 1.3.1
nvidia driver : 418.67
torch cuda    : 10.1.243 / is available
torch cudnn   : 7603 / is enabled

=== Hardware === 
nvidia gpus   : 1
torch devices : 1
  - gpu0      : 7611MB | Tesla P4

=== Environment === 
platform      : Linux-4.14.137+-x86_64-with-Ubuntu-18.04-bionic
distro        : Ubuntu 18.04 bionic
conda env     : Unknown
python        : /usr/bin/python3
sys.path      : 
/env/python
/usr/lib/python36.zip
/usr/lib/python3.6
/usr/lib/python3.6/lib-dynload
/usr/local/lib/python3.6/dist-packages
/usr/lib/python3/dist-packages
/usr/local/lib/python3.6/dist-packages/IPython/extensions
/root/.ipython

Sun Dec 29 16:58:29 2019       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 440.44       Driver Version: 418.67       CUDA Version: 10.1     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  Tesla P4            Off  | 00000000:00:04.0 Off |                    0 |
| N/A   54C    P0    24W /  75W |   1033MiB /  7611MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
+-----------------------------------------------------------------------------+
2

@jeremy We are having problem while running a pikle file.
We are using Roberta for sentiment analysis, we have build a model and saved it in pkl file, but after loading, it is giving error “AttributeError: ‘TransformersVocab’ object has no attribute ‘tokenizer’”.
Can you help me with this?

3

@SylwiaOliwia We are using Roberta for sentiment analysis, we have build a model and saved it in pkl file, but after loading, it is giving error “AttributeError: ‘TransformersVocab’ object has no attribute ‘tokenizer’”.
Can you help me with this?
I am using this thread: