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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
533462810 MDExOlB1bGxSZXF1ZXN0MzQ5NTMzMTYz 3597 Add Facetgrid.row_labels & Facetgrid.col_labels dcherian 2448579 closed 0     2 2019-12-05T16:35:38Z 2019-12-10T15:41:24Z 2019-12-10T15:41:21Z MEMBER   0 pydata/xarray/pulls/3597

This allows labels to be changed later using Facetgrid.set_titles. We now save handles in Facetgrid.row_labels and Facetgrid.col_labels. I also added some API docs for facetgrid.

Example g = darray.plot.imshow(row="row", col="col") g.set_titles("abc={value}")

before (see row labels; the column labels work because those are set using set_title. )

after

  • [x] Tests added
  • [x] Passes black . && mypy . && flake8
  • [x] Fully documented, including whats-new.rst for all changes and api.rst for new API
 
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     xarray 13221727 pull
533578755 MDU6SXNzdWU1MzM1Nzg3NTU= 3599 map_blocks graph construction bug dcherian 2448579 closed 0     0 2019-12-05T20:23:06Z 2019-12-07T04:30:19Z 2019-12-07T04:30:19Z MEMBER      

Just making a new issue for #3598

The tests for https://github.com/pydata/xarray/pull/3584 fail on dask == 2.8.1 with this interesting bug. Here's a reproducible example.

``` python import dask import xarray as xr

ds = xr.Dataset({'x': (('y',), dask.array.ones(10, chunks=(3,)))}) mapped = ds.map_blocks(lambda x: x) mapped.compute() # works

xr.testing.assert_equal(mapped, ds) # does not work xr.testing.assert_equal(mapped, ds.compute()) # works xr.testing.assert_equal(mapped.compute(), ds) # works xr.testing.assert_equal(mapped.compute(), ds.compute()) # works ```

The traceback is ``` ~/miniconda3/envs/dcpy/lib/python3.7/site-packages/dask/array/optimization.py in optimize(dsk, keys, fuse_keys, fast_functions, inline_functions_fast_functions, rename_fused_keys, **kwargs) 41 if isinstance(dsk, HighLevelGraph): 42 dsk = optimize_blockwise(dsk, keys=keys) ---> 43 dsk = fuse_roots(dsk, keys=keys) 44 45 # Low level task optimizations

~/miniconda3/envs/dcpy/lib/python3.7/site-packages/dask/blockwise.py in fuse_roots(graph, keys) 819 isinstance(layer, Blockwise) 820 and len(deps) > 1 --> 821 and not any(dependencies[dep] for dep in deps) # no need to fuse if 0 or 1 822 and all(len(dependents[dep]) == 1 for dep in deps) 823 ):

~/miniconda3/envs/dcpy/lib/python3.7/site-packages/dask/blockwise.py in <genexpr>(.0) 819 isinstance(layer, Blockwise) 820 and len(deps) > 1 --> 821 and not any(dependencies[dep] for dep in deps) # no need to fuse if 0 or 1 822 and all(len(dependents[dep]) == 1 for dep in deps) 823 ):

KeyError: 'lambda-6720ab0e3639d5c63fc06dfc66a3ce47-x' ```

This key is not in dependencies. From https://github.com/dask/dask/blob/67fb5363009c583c175cb577776a4f2f4e811410/dask/blockwise.py#L816-L826

python for name, layer in graph.layers.items(): deps = graph.dependencies[name] if ( isinstance(layer, Blockwise) and len(deps) > 1 and not any(dependencies[dep] for dep in deps) # no need to fuse if 0 or 1 and all(len(dependents[dep]) == 1 for dep in deps) ): new = toolz.merge(layer, *[layers[dep] for dep in deps]) new, _ = fuse(new, keys, ave_width=len(deps))

I'm not sure whether this is a bug in fuse_roots, HighLevelGraph.from_collections or in how map_blocks calls HighLevelGraph.from_collections here: https://github.com/pydata/xarray/blob/69c85b85a1ef5d13b6ca51b6b655a1f719cc5abf/xarray/core/parallel.py#L315

 
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   completed xarray 13221727 issue

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