directional_svd()

std::tuple< STensor, STensor, SBasis > syten::IPEPSv2::directional_svd	(	STensor const &	in,
		SBasisId const &	aux,
		SBasisId const &	phy
	)

Like directional_qr, decomposes the state tensor into a rank-3 tensor with auxiliary basis aux and the physical basis phy, but does so using a truncating SVD.

References syten::STensorImpl::STensor::b(), syten::STensorImpl::demerge(), syten::STensorImpl::SBasis::dir(), syten::STensorImpl::flip_on_tensor(), syten::IdentityDenseTensorImpl::merge(), std::move(), syten::STensorImpl::SBasis::name(), syten::STensorImpl::snorm(), syten::sqrt(), syten::STensorImpl::svd(), SYTEN_ASSERT, and SYTEN_SMALL_THRESHOLD.

Referenced by full_update_horizontal(), and full_update_vertical().

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