issues: 573972855

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
573972855 MDExOlB1bGxSZXF1ZXN0MzgyMzgyODA5 3818 map_blocks: Allow passing dask-backed objects in args 2448579 closed 0     7 2020-03-02T13:26:12Z 2020-06-11T18:22:42Z 2020-06-07T16:13:35Z MEMBER   0 pydata/xarray/pulls/3818
  • [x] Tests added
  • [x] Passes isort -rc . && black . && mypy . && flake8
  • [x] Fully documented, including whats-new.rst for all changes and api.rst for new API

It parses args and breaks any xarray objects into appropriate blocks before passing them on to the user function.

e.g. ```python da1 = xr.DataArray( np.ones((10, 20)), dims=["x", "y"], coords={"x": np.arange(10), "y": np.arange(20)} ).chunk({"x": 5, "y": 4}) da1

def sumda(da1, da2): #print(da1.shape) #print(da2.shape) return da1 - da2

da3 = (da1 + 1).isel(x=1, drop=True).rename({"y": "k"}) mapped = xr.map_blocks(sumda, da1, args=[da3]) xr.testing.assert_equal(da1-da3, mapped) # passes ```

 
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