On loading a metric from datasets, I get the following error
MEMBER
Hi ! We support only pyarrow > 0.17.1 so that we have access to the `PyExtensionType` object.
Could you update pyarrow and try again ?
```
pip install --upgrade pyarrow
```
2020-11-09T09:12:35Z
https://github.com/huggingface/datasets/issues/805#issuecomment-723878040
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2020-11-09T09:12:35Z
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`from datasets import load_metric`

`metric = load_metric('bleurt')`

Traceback:
210 class _ArrayXDExtensionType(pa.PyExtensionType):
    211 
    212     ndims: int = None

AttributeError: module 'pyarrow' has no attribute 'PyExtensionType'

Any help will be appreciated. Thank you. 