issue_comments: 651796020

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html_url issue_url id node_id user created_at updated_at author_association body reactions performed_via_github_app issue
https://github.com/pydata/xarray/pull/4060#issuecomment-651796020 https://api.github.com/repos/pydata/xarray/issues/4060 651796020 MDEyOklzc3VlQ29tbWVudDY1MTc5NjAyMA== 10194086 2020-06-30T13:37:19Z 2020-06-30T13:37:19Z MEMBER

You could go for something like this:

```python output_sizes_renamed = dict() for key, value in output_sizes.items():

if key not in signature.output_core_dims:
    raise ValueError("dimension name in 'output_sizes' must correspond to output_core_dims")
output_sizes_renamed[signature.dims_map[key]] = value

```

Instead of python output_sizes = { signature.dims_map[key]: value for key, value in output_sizes.items() }

 
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