module 'functools' has no attribute 'cached_property'

[olaviinha]

Second cell in Colab Notebook results in the following error.

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
[<ipython-input-2-152851d66c54>](https://localhost:8080/#) in <module>()
     14 import seqio
     15 import t5
---> 16 import t5x
     17 
     18 from mt3 import metrics_utils

4 frames
[/content/t5x/__init__.py](https://localhost:8080/#) in <module>()
     15 """Import API modules."""
     16 
---> 17 import t5x.adafactor
     18 import t5x.checkpoints
     19 import t5x.decoding

[/content/t5x/adafactor.py](https://localhost:8080/#) in <module>()
     61 import jax.numpy as jnp
     62 import numpy as np
---> 63 from t5x import utils
     64 from t5x.optimizers import OptimizerDef
     65 from t5x.optimizers import OptimizerState

[/content/t5x/utils.py](https://localhost:8080/#) in <module>()
     41 import numpy as np
     42 import seqio
---> 43 from t5x import checkpoints
     44 from t5x import optimizers
     45 from t5x import partitioning

[/content/t5x/checkpoints.py](https://localhost:8080/#) in <module>()
     50 from t5x import checkpoint_utils
     51 from t5x import optimizers
---> 52 from t5x import partitioning
     53 from t5x import state_utils
     54 from t5x import train_state as train_state_lib

[/content/t5x/partitioning.py](https://localhost:8080/#) in <module>()
     45   cached_property = property  # pylint: disable=invalid-name
     46 else:
---> 47   cached_property = functools.cached_property  # pylint: disable=invalid-name
     48 
     49 

AttributeError: module 'functools' has no attribute 'cached_property'

[trevorwelch]

My guess is that the t5x library needs to make an update for backwards compatibility like so: GEM-benchmark/GEM-metrics#69

This seems to be related to python 3.7 vs. 3.8, Colab is currently running 3.7

[trevorwelch]

Workaround:

1. Download a copy of the Colab notebook locally
2. Find the kernelspec around line 538, replace it like so:

    "kernelspec": {
      "name": "py38",
      "display_name": "Python 3.8"
    }

3. Upload/import the modified notebook
4. Add the following to the top of the notebook and run it:

!wget -O mini.sh https://repo.anaconda.com/miniconda/Miniconda3-py38_4.8.2-Linux-x86_64.sh
!chmod +x mini.sh
!bash ./mini.sh -b -f -p /usr/local
!conda install -q -y jupyter
!conda install -q -y google-colab -c conda-forge
!python -m ipykernel install --name "py38" --user

5. sys.version should now show '3.8.1 (default, Jan 8 2020, 22:29:32) \n[GCC 7.3.0]'

6. Under Runtime select Change runtime type and select Python3.8

The session fails to recognize GPU/TPU but everything else runs, transcription works

[olaviinha]

Awesome, thanks!

Another workaround appears to be adding the following line to the beginning of filet5x/partitioning.py:

# pylint: disable-next=unused-import

(...live in Colab after t5x installation.)

[olaviinha]

This problem seems to have magically disappeared without further need to perform either of the workarounds above. Closing.