Use new merge_chunks function in reduction
#256
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using `map_direct` rather than using `rechunk`, and is therefore amenable to blockwise fusion.
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Fixes #221
The key idea here is that
merge_chunksis implemented usingmap_directrather than usingrechunk, and is therefore amenable to blockwise fusion.Here are the before/after plans for
lithops-matmul-random.py- note that there are 5 arrays to compute, rather than 7:There are 20% fewer tasks too, which makes the computation run faster