def test_annotation_pack_unpack():
layer = MaterializedLayer({"n": 42}, annotations={"workers": ("alice", )})
packed_anno = layer.__dask_distributed_annotations_pack__()
annotations = {}
Layer.__dask_distributed_annotations_unpack__(annotations, packed_anno,
layer.keys())
assert annotations == {"workers": {"n": ("alice", )}}
def test_materializedlayer_cull_preserves_annotations():
layer = MaterializedLayer(
{
"a": 42,
"b": 3.14
},
annotations={"foo": "bar"},
)
culled_layer, _ = layer.cull({"a"}, [])
assert len(culled_layer) == 1
assert culled_layer.annotations == {"foo": "bar"}
def _rename_layer(layer, keymap, salt):
"""Rename a single layer in a :class:`dask.highlevelgraph.HighLevelGraph`."""
if type(layer) is Blockwise:
new_indices = tuple(
(_rename_key(name, salt) if ind is not None else name, ind)
for name, ind in layer.indices)
sub_keymap = {key: _rename_key(key, salt) for key in layer.dsk}
kwargs = {}
# The available arguments depend on the Dask version.
sig = inspect.signature(Blockwise)
for arg_name in ['output_blocks', 'annotations']:
if arg_name in sig.parameters:
kwargs[arg_name] = getattr(layer, arg_name)
if 'io_deps' in sig.parameters:
kwargs['io_deps'] = {
_rename_key(key, salt): value
for key, value in layer.io_deps.items()
}
return Blockwise(
_rename_key(layer.output, salt), layer.output_indices,
_rename_layer(layer.dsk, sub_keymap, salt), new_indices, {
_rename_key(name, salt): value
for name, value in layer.numblocks.items()
}, layer.concatenate, layer.new_axes, **kwargs)
elif type(layer) is MaterializedLayer:
mapping = {
keymap[key]: _rename(value, keymap)
for (key, value) in layer.mapping.items()
}
return MaterializedLayer(mapping, layer.annotations)
else:
return {
keymap[key]: _rename(value, keymap)
for (key, value) in layer.items()
}
async def test_annotation_pack_unpack(c, s, a, b):
hlg = HighLevelGraph({"l1": MaterializedLayer({"n": 42})}, {"l1": set()})
packed_hlg = hlg.__dask_distributed_pack__(c, ["n"])
annotations = {"workers": ("alice",)}
unpacked_hlg = HighLevelGraph.__dask_distributed_unpack__(packed_hlg, annotations)
annotations = unpacked_hlg["annotations"]
assert annotations == {"workers": {"n": ("alice",)}}
def _build_map_layer(
func: Callable,
prev_name: str,
new_name: str,
collection,
dependencies: tuple[Delayed, ...] = (),
) -> Layer:
"""Apply func to all keys of collection. Create a Blockwise layer whenever possible;
fall back to MaterializedLayer otherwise.
Parameters
----------
func
Callable to be invoked on the graph node
prev_name : str
name of the layer to map from; in case of dask base collections, this is the
collection name. Note how third-party collections, e.g. xarray.Dataset, can
have multiple names.
new_name : str
name of the layer to map to
collection
Arbitrary dask collection
dependencies
Zero or more Delayed objects, which will be passed as arbitrary variadic args to
func after the collection's chunk
"""
if _can_apply_blockwise(collection):
# Use a Blockwise layer
try:
numblocks = collection.numblocks
except AttributeError:
numblocks = (collection.npartitions, )
indices = tuple(i for i, _ in enumerate(numblocks))
kwargs = {
"_deps": [d.key for d in dependencies]
} if dependencies else {}
return blockwise(
func,
new_name,
indices,
prev_name,
indices,
numblocks={prev_name: numblocks},
dependencies=dependencies,
**kwargs,
)
else:
# Delayed, bag.Item, dataframe.core.Scalar, or third-party collection;
# fall back to MaterializedLayer
dep_keys = tuple(d.key for d in dependencies)
return MaterializedLayer({
replace_name_in_key(k, {prev_name: new_name}): (func, k) + dep_keys
for k in flatten(collection.__dask_keys__())
if get_name_from_key(k) == prev_name
})
async def test_pack_MaterializedLayer_handles_futures_in_graph_properly(
c, s, a, b):
fut = c.submit(inc, 1)
hlg = HighLevelGraph(
{
"l1": MaterializedLayer({
"x": fut,
"y": (inc, "x"),
"z": (inc, "y")
})
},
{"l1": set()},
)
# fill hlg.key_dependencies cache. This excludes known futures, so only
# includes a subset of all dependencies. Previously if the cache was present
# the future dependencies would be missing when packed.
hlg.get_all_dependencies()
packed = hlg.__dask_distributed_pack__(c, ["z"], {})
unpacked = HighLevelGraph.__dask_distributed_unpack__(packed)
assert unpacked["deps"] == {"x": {fut.key}, "y": {fut.key}, "z": {"y"}}
def test_highlevelgraph_dicts_deprecation():
with pytest.warns(FutureWarning):
layers = {"a": MaterializedLayer({"x": 1, "y": (inc, "x")})}
hg = HighLevelGraph(layers, {"a": set()})
assert hg.dicts == layers
