pull_requests: 447356800

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id node_id number state locked title user body created_at updated_at closed_at merged_at merge_commit_sha assignee milestone draft head base author_association auto_merge repo url merged_by
447356800 MDExOlB1bGxSZXF1ZXN0NDQ3MzU2ODAw 4214 closed 0 Add initial cupy tests 1610850 Added some initial unit tests for cupy. Mainly to create a place for cupy tests to go and to check some basic functionality. I've created a fixture which constructs the dataset from the Toy weather data example and converts the underlying arrays to cupy. Then I've added a test which checks that after calling operations such as `mean` and `groupby` the resulting DataArray is still backed by a cupy array. The main penalty with working on GPUs is accidentally shunting data back and forth between the GPU and system memory. Copying data over the PCI bus is slow compared to the rest of the work so should be avoided. So this first test is checking that we are leaving things on the GPU. Because this data copying is so expensive cupy have intentionally broken the `__array__` method and introduced a `.get` method instead. This means that users have to be explicit in converting back to numpy and copying back to the main memory. Therefore we will need to add some logic to xarray to use `.get` in appropriate situations such as plotting. - [x] Releated to #4212 - [x] Tests added - [x] Passes `isort -rc . && black . && mypy . && flake8` 2020-07-10T10:20:33Z 2020-07-13T16:32:35Z 2020-07-13T15:07:45Z 2020-07-13T15:07:44Z 52043bc57f20438e8923790bca90b646c82442ad     0 cff60a17ee7a5e05033711578e28ed94acb73121 7bf9df9d75c40bcbf2dd28c47204529a76561a3f CONTRIBUTOR   13221727 https://github.com/pydata/xarray/pull/4214  

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