issue_comments: 1526240154

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https://github.com/pydata/xarray/issues/7764#issuecomment-1526240154 https://api.github.com/repos/pydata/xarray/issues/7764 1526240154 IC_kwDOAMm_X85a-JOa 2448579 2023-04-27T19:25:29Z 2023-04-27T19:25:29Z MEMBER

numpy.einsum has some version of opt_einsum implemented under the optimize kwarg. IIUC this is False by default because it adds overhead to small problems (comment)

The complete overhead for computing a path (parsing the input, finding the path, and organization that data) with default options is about 150us. Looks like einsum takes a minimum of 5-10us to call as a reference. So the worst case scenario would be that the optimization overhead makes einsum 30x slower. Personally id go for turning optimization off by default and then revisiting if someone tackles the parsing issue to reduce the overhead.

 
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