"torch.backends.opt_einsum.enabled" is "True". By default,
   torch.einsum will try the "auto" strategy, but the "greedy" and
   "optimal" strategies are also supported. Note that the "optimal"
   strategy is factorial on the number of inputs as it tries all
   possible paths. See more details in opt_einsum's docs (https
   ://optimized-einsum.readthedocs.io/en/stable/path_finding.html).
torch.backends.xeon