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◆ cost_function()

SRDef syten::IPEPS::FullUpdate::cost_function ( Tensor< 4 >  n,
Tensor< 4 >  gab,
Tensor< 3 >  a,
Tensor< 3 >  b 
)

Internal cost function to measure the convergence of the full-update ALS scheme.

References syten::abs(), syten::IPEPS::FullUpdate::cost_function(), syten::sqrt(), and syten::YesNo< struct _prod_conj >::y().

Referenced by syten::IPEPS::FullUpdate::apply_op(), and syten::IPEPS::FullUpdate::cost_function().

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