BUG/ENH: Einsum optimization path updates and bug fixes. #11491
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* Minor tweaks to the optimal path based on opt_einsum * Updates greedy path to current opt_einsum tech * Reworks einsum broadcasting vs dot tech and can_dot logic * MAINT: Fix typo in comment. * BUG: Fix bad merge fixup.
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Backport of #11345.
Syncs einsum path optimization tech between
numpyandopt_einsum. In particular, thegreedypath has received many enhancements by @jcmgray. A full list of issues fixed in this PR are:greedypath. Fixes einsum_path greedy optimize ignores memory limit in some cases #11210.can_dotfunctionality that previous missed an edge case (part of einsum optimization failure and inconsistency #11308).