issue_comments: 592101136
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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/issues/3698#issuecomment-592101136 | https://api.github.com/repos/pydata/xarray/issues/3698 | 592101136 | MDEyOklzc3VlQ29tbWVudDU5MjEwMTEzNg== | 1312546 | 2020-02-27T18:13:28Z | 2020-02-27T18:13:28Z | MEMBER | It looks like xarray is getting a bad task graph after the optimize. ```python In [1]: import xarray as xr import dask In [2]: import dask In [3]: a = dask.array.ones((10,5), chunks=(1,3)) ...: a = dask.optimize(a)[0] In [4]: da = xr.DataArray(a.compute()).chunk({"dim_0": 5}) ...: da = dask.optimize(da)[0] In [5]: dict(da.dask_graph()) Out[5]: {('xarray-<this-array>-e2865aa10d476e027154771611541f99', 1, 0): (<function _operator.getitem(a, b, /)>, 'xarray-<this-array>-e2865aa10d476e027154771611541f99', (slice(5, 10, None), slice(0, 5, None))), ('xarray-<this-array>-e2865aa10d476e027154771611541f99', 0, 0): (<function _operator.getitem(a, b, /)>, 'xarray-<this-array>-e2865aa10d476e027154771611541f99', (slice(0, 5, None), slice(0, 5, None)))} ``` Notice that are references to If we manually insert that, you'll see things work ```python In [9]: dsk['xarray-<this-array>-e2865aa10d476e027154771611541f99'] = da._to_temp_dataset()[xr.core.dataarray._THIS_ARRAY] In [11]: dask.get(dsk, keys=[('xarray-<this-array>-e2865aa10d476e027154771611541f99', 1, 0)]) Out[11]: (<xarray.DataArray \<this-array> (dim_0: 5, dim_1: 5)> dask.array<getitem, shape=(5, 5), dtype=float64, chunksize=(5, 5), chunktype=numpy.ndarray> Dimensions without coordinates: dim_0, dim_1,) ``` |
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