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https://github.com/pydata/xarray/issues/1995#issuecomment-373579142 https://api.github.com/repos/pydata/xarray/issues/1995 373579142 MDEyOklzc3VlQ29tbWVudDM3MzU3OTE0Mg== 1217238 2018-03-16T01:55:44Z 2018-03-16T01:55:44Z MEMBER

Try: ```python import dask.array import numpy as np

def mulsum_chunk(a, b): return np.einsum('...i,...i', a, b)[..., np.newaxis]

def mulsum(a, b): # needs broadcasting/rechunking for a,b mapped = dask.array.map_blocks(mulsum_chunk, a, b, dtype=float, chunks=a.chunks[:-1] + (tuple(1 for _ in a.chunks[-1]),)) return dask.array.sum(mapped, axis=-1) ```

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