dask 2021.10.0

ParametersReturnsBackRef
optimize_blockwise(graph, keys=())

For operations that have multiple Blockwise operations one after the other, like x.T + 123 we can fuse these into a single Blockwise operation. This happens before any actual tasks are generated, and so can reduce overhead.

This finds groups of Blockwise operations that can be safely fused, and then passes them to rewrite_blockwise for rewriting.

Parameters

graph : HighLevelGraph
keys : Iterable

The keys of all outputs of all collections. Used to make sure that we don't fuse a layer needed by an output

Returns

HighLevelGraph

High level optimization of stacked Blockwise layers

See Also

rewrite_blockwise

Examples

See :

Back References

The following pages refer to to this document either explicitly or contain code examples using this.

dask.blockwise.rewrite_blockwise

Local connectivity graph

Hover to see nodes names; edges to Self not shown, Caped at 50 nodes.

Using a canvas is more power efficient and can get hundred of nodes ; but does not allow hyperlinks; , arrows or text (beyond on hover)

SVG is more flexible but power hungry; and does not scale well to 50 + nodes.

All aboves nodes referred to, (or are referred from) current nodes; Edges from Self to other have been omitted (or all nodes would be connected to the central node "self" which is not useful). Nodes are colored by the library they belong to, and scaled with the number of references pointing them


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