demerge()

STensor syten::STensorImpl::demerge	(	STensor const &	in,
		SBasis const &	f1,
		SBasis const &	f2,
		Index	maxBlocksize = Maximum(),
		SRDef	ratio = 1.,
		Index	minBlocksize = 1,
		bool	ethereal = true,
		SourceLocation const &	loc = SourceLocation::current()
	)

Given a tensor and two bases, constructs the merged bases of the two and then splits that basis of the tensor in back into bases f1 and f2.

Remarks

This function is autodifferentiable but then requires explicit construction of the full demerging tensor.

References syten::STensorImpl::STensor::bi(), syten::STensorImpl::SBasis::dir(), gen_merge(), prod(), SYTEN_ASSERT_MSG, and SYTEN_PRETTY_SLOC.

Referenced by syten::T3N::Contraction::decontractToPhysicalBranching(), syten::T3N::Contraction::decontractToPhysicalPhysical(), syten::IPEPSv2::directional_qr(), syten::IPEPSv2::directional_svd(), syten::IPEPSv2::exp(), syten::IPEPSv2::expectation_value(), syten::IPEPSv2::full_update_apply_gate(), syten::IPEPSv2::full_update_gauge_fix(), syten::IPEPSv2::full_update_horizontal(), syten::IPEPSv2::full_update_pseudo_invert_r4(), syten::IPEPSv2::full_update_vertical(), syten::IPEPSv2::simple_update(), svd(), syten::T3N::TDVP::Worker::update_phys_branch_phys(), and syten::T3N::TDVP::Worker::update_phys_phys().

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