pseudo_invert()

std::tuple< SRDef, STensor > syten::STensorImpl::pseudo_invert

(

STensor const &

in

)

Inverts the tensor using a SVD and returns the condition number of the result, which is obtained as the ratio of the largest and smallest inverted singular value.

Remarks

This function is not autodifferentiable.

References syten::STensorImpl::STensor::autodiff_enabled(), syten::STensorImpl::STensor::b(), syten::STensorImpl::SBasis::f(), syten::STensorImpl::STensor::get_fermionic_order(), if_constexpr, std::move(), syten::STensorImpl::STensor::rank(), SYTEN_ASSERT, SYTEN_TENSOR_RANK, and syten::STensorImpl::STensor::visnz().

Referenced by syten::STensorImpl::Autodiff::qr_adjoint_evaluator().

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