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Support CuPy-backed arrays in DaskManager #11383

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1a03e39
Support CuPy-backed arrays in DaskManager.from_array method
weiji14 Jun 13, 2026
4465ea4
Fix no-untyped-call
weiji14 Jun 13, 2026
16009ee
Merge branch 'main' into dask_with_cupy
weiji14 Jun 14, 2026
b77cc57
Implement __array_namespace__ method on NDArrayMixin
weiji14 Jun 15, 2026
558f171
Merge branch 'main' into dask_with_cupy
weiji14 Jun 17, 2026
286053f
Fix repls for LazilyIndexedArray, MemoryCachedArray and IndexingAdapter
weiji14 Jun 17, 2026
551abe8
Fix mypy unused-ignore
weiji14 Jun 17, 2026
ba652b8
Merge branch 'main' into dask_with_cupy
weiji14 Jun 18, 2026
7132f73
Put __array_namespace__ on ImplicitToExplicitIndexingAdapter instead
weiji14 Jun 18, 2026
3980fcb
Merge branch 'main' into dask_with_cupy
keewis Jun 18, 2026
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4 changes: 3 additions & 1 deletion xarray/compat/array_api_compat.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
from types import ModuleType

import numpy as np

from xarray.namedarray.pycompat import array_type
Expand Down Expand Up @@ -46,7 +48,7 @@ def result_type(*arrays_and_dtypes, xp) -> np.dtype:
return _future_array_api_result_type(*arrays_and_dtypes, xp=xp)


def get_array_namespace(*values):
def get_array_namespace(*values) -> ModuleType:
def _get_single_namespace(x):
if hasattr(x, "__array_namespace__"):
return x.__array_namespace__()
Expand Down
6 changes: 5 additions & 1 deletion xarray/core/formatting.py
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,8 @@
from xarray.core.indexing import (
BasicIndexer,
ExplicitlyIndexed,
IndexingAdapter,
LazilyIndexedArray,
MemoryCachedArray,
)
from xarray.core.options import OPTIONS, _get_boolean_with_default
Expand Down Expand Up @@ -700,7 +702,9 @@ def short_data_repr(array):

if isinstance(array, np.ndarray):
return short_array_repr(array)
elif is_duck_array(internal_data):
elif not isinstance(
internal_data, (LazilyIndexedArray, MemoryCachedArray, IndexingAdapter)

@dcherian dcherian Jun 17, 2026

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Suggested change
internal_data, (LazilyIndexedArray, MemoryCachedArray, IndexingAdapter)
internal_data, ExplicitlyIndexed

is usually the way to do it

@weiji14 weiji14 Jun 18, 2026 •
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Excellent hint, but actually, not needed anymore. I talked to @keewis on the Pangeo call just now, and figured out the right-level of abstraction is to put the __array_namespace__ method in ImplicitToExplicitIndexingAdapter instead of NDArrayMixin (commit 7132f73). So we won't need to change this repr stuff anymore.

@weiji14 weiji14 Jun 18, 2026 •
edited
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Oh wait, commit 7132f73 might not be correct either 😅 I'll actually need to use your suggestion here, and really should write a proper test for this first...

@dcherian dcherian Jun 18, 2026 •
edited
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Here github still has the version of the notebook:L https://github.com/dcherian/cupy-xarray/blob/kvikio-entrypoint/docs/source/kvikio.ipynb

Doesn't work: Chunk with dask is the section

And this is the issue:
https://github.com/dask/dask/blob/cbbac094376f03d4d3fb933a6f115e3416981263/dask/array/core.py#L120-L144

Today, that np.asarray is what triggers a concrete read in to memory. If you advertise array-namespace and thus satisfy is_arraylike that read isn't triggered. we could add a patch to dask to hardcode support for xarray classes and call .get_duck_array (i bet this is fine).

My bigger concern is that advertising array api compliance will break random downstream code in a similar way somehow (but maybe not).

) and is_duck_array(internal_data):
return limit_lines(repr(array.data), limit=40)
elif getattr(array, "_in_memory", None):
return short_array_repr(array)
Expand Down
2 changes: 1 addition & 1 deletion xarray/core/indexing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -687,7 +687,7 @@ def __array__(
else:
return np.asarray(self.get_duck_array(), dtype=dtype)

def get_duck_array(self):
def get_duck_array(self) -> duckarray:
return self.array.get_duck_array()

def __getitem__(self, key: Any):
Expand Down
5 changes: 5 additions & 0 deletions xarray/core/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -704,6 +704,11 @@ def dtype(self: Any) -> np.dtype:
def shape(self: Any) -> tuple[int, ...]:
return self.array.shape

def __array_namespace__(self: Any) -> ModuleType:
from xarray.compat.array_api_compat import get_array_namespace

return get_array_namespace(self.array)

def __getitem__(self: Any, key):
return self.array[key]

Expand Down
2 changes: 1 addition & 1 deletion xarray/namedarray/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -843,7 +843,7 @@ def chunk(
# Using OuterIndexer is a pragmatic choice: dask does not yet handle
# different indexing types in an explicit way:
# https://github.com/dask/dask/issues/2883
ndata = ImplicitToExplicitIndexingAdapter(data_old, OuterIndexer) # type: ignore[assignment]
ndata = ImplicitToExplicitIndexingAdapter(data_old, OuterIndexer)

if is_dict_like(chunks):
chunks = tuple(starmap(chunks.get, enumerate(ndata.shape)))
Expand Down
5 changes: 3 additions & 2 deletions xarray/namedarray/daskmanager.py
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Original file line number Diff line number Diff line change
Expand Up @@ -68,8 +68,9 @@ def from_array(
import dask.array as da

if isinstance(data, ImplicitToExplicitIndexingAdapter):
# lazily loaded backend array classes should use NumPy array operations.
kwargs["meta"] = np.ndarray
# lazily loaded backend array classes should use NumPy or CuPy array operations.
xp = data.__array_namespace__()
kwargs["meta"] = xp.ndarray

return da.from_array(
data,
Expand Down
2 changes: 1 addition & 1 deletion xarray/namedarray/pycompat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -140,7 +140,7 @@ def to_duck_array(data: Any, **kwargs: dict[str, Any]) -> duckarray[_ShapeType,
return loaded_data

if isinstance(data, ExplicitlyIndexed | ImplicitToExplicitIndexingAdapter):
return data.get_duck_array() # type: ignore[no-untyped-call, no-any-return]
return data.get_duck_array()
elif is_duck_array(data):
return data
else:
Expand Down
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