Performs directional finite-chain two-site DMRG updates. More...

#include <uni20/async/debug_scheduler.hpp>
#include <uni20/common/performance_measurements.hpp>
#include <uni20/core/math.hpp>
#include <uni20/core/numeric_limits.hpp>
#include <uni20/core/scalar_concepts.hpp>
#include <uni20/krylov/block_tensor_vector.hpp>
#include <uni20/symmetry/block_tensor_contract.hpp>
#include <uni20/tensor_network/dmrg_lanczos.hpp>
#include <uni20/tensor_network/environment_cache.hpp>
#include <uni20/tensor_network/two_site_effective_hamiltonian.hpp>
#include <uni20/tensor_network/two_site_split.hpp>
#include <algorithm>
#include <cmath>
#include <concepts>
#include <cstddef>
#include <functional>
#include <optional>
#include <stdexcept>
#include <string_view>
#include <type_traits>
#include <utility>
#include <vector>

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Classes
struct	uni20::tensor_network::TwoSiteDmrgOptions< Real >
	Numerical policies for one finite-chain two-site DMRG update. More...

struct	uni20::tensor_network::TwoSiteDmrgRunOptions< Real >
	Policies for an alternating finite-chain two-site DMRG run. More...

struct	uni20::tensor_network::TwoSiteDmrgRunResult< Real >
	Result of an alternating finite-chain two-site DMRG run. More...

struct	uni20::tensor_network::TwoSiteDmrgStepResult< Real, InstalledBond >
	Diagnostics and selected bond data from one DMRG bond update. More...

struct	uni20::tensor_network::TwoSiteDmrgSweepSummary< Real >
	Aggregate diagnostics for one completed directional DMRG sweep. More...

Namespaces
namespace	uni20

namespace	uni20::tensor_network

Typedefs
using	uni20::tensor_network::DetailedTwoSiteDmrgPerformanceMeasurements = performance::DetailedMeasurements< TwoSiteDmrgPerformanceEvent, static_cast< std::size_t >(TwoSiteDmrgPerformanceEvent::count)>
	Detailed DMRG measurements including per-sector block-SVD batch timings.

using	uni20::tensor_network::TwoSiteDmrgPerformanceMeasurements = performance::DurationMeasurements< TwoSiteDmrgPerformanceEvent, static_cast< std::size_t >(TwoSiteDmrgPerformanceEvent::count)>
	Coarse inclusive wall-duration measurements for two-site DMRG phases.

Enumerations
enum class	uni20::tensor_network::TwoSiteDmrgPerformanceEvent { uni20::tensor_network::run , uni20::tensor_network::sweep , uni20::tensor_network::bond_update , uni20::tensor_network::center_construction , uni20::tensor_network::local_eigensolver , uni20::tensor_network::effective_hamiltonian_application , uni20::tensor_network::krylov_vector_allocation , uni20::tensor_network::krylov_vector_update , uni20::tensor_network::krylov_reduction , uni20::tensor_network::block_svd , uni20::tensor_network::svd_sector_batch , uni20::tensor_network::state_selection , uni20::tensor_network::factor_materialization , uni20::tensor_network::environment_update , uni20::tensor_network::count }
	Stable phase identifiers for two-site DMRG performance measurements. More...

Functions
template<class MpsChain , class MpoChain , SparseBlockStorage EnvironmentStorage, class Measurements , BlockTensorStorage CenterStorage = typename MpsChain::storage_policy> requires detail::TwoSiteCenterStorageFor<CenterStorage, typename MpsChain::value_type> && performance::DurationMeasurementPolicy<Measurements, TwoSiteDmrgPerformanceEvent>
auto	uni20::tensor_network::optimize_two_site_dmrg_bond (MpsChain &mps, MpoChain const &mpo, MpoEnvironmentCache< MpsChain, MpoChain, EnvironmentStorage > &cache, std::size_t first_site, MpsSweepDirection direction, TwoSiteDmrgOptions< make_real_t< typename MpsChain::value_type > > const &options, Measurements &measurements, CenterStorage center_storage={})
	Optimize and replace one adjacent MPS pair with a measured ground-state DMRG step.

template<class MpsChain , class MpoChain , SparseBlockStorage EnvironmentStorage, BlockTensorStorage CenterStorage = typename MpsChain::storage_policy> requires detail::TwoSiteCenterStorageFor<CenterStorage, typename MpsChain::value_type>
auto	uni20::tensor_network::optimize_two_site_dmrg_bond (MpsChain &mps, MpoChain const &mpo, MpoEnvironmentCache< MpsChain, MpoChain, EnvironmentStorage > &cache, std::size_t first_site, MpsSweepDirection direction, TwoSiteDmrgOptions< make_real_t< typename MpsChain::value_type > > const &options={}, CenterStorage center_storage={})
	Optimize and replace one adjacent MPS pair without performance measurements.

template<class MpsChain , class MpoChain , SparseBlockStorage EnvironmentStorage, class Measurements , BlockTensorStorage CenterStorage = typename MpsChain::storage_policy> requires detail::TwoSiteCenterStorageFor<CenterStorage, typename MpsChain::value_type> && performance::DurationMeasurementPolicy<Measurements, TwoSiteDmrgPerformanceEvent>
auto	uni20::tensor_network::run_two_site_dmrg (MpsChain &mps, MpoChain const &mpo, MpoEnvironmentCache< MpsChain, MpoChain, EnvironmentStorage > &cache, TwoSiteDmrgRunOptions< make_real_t< typename MpsChain::value_type > > const &options, Measurements &measurements, CenterStorage center_storage={})
	Run measured alternating directional sweeps until terminal-energy convergence.

template<class MpsChain , class MpoChain , SparseBlockStorage EnvironmentStorage, BlockTensorStorage CenterStorage = typename MpsChain::storage_policy> requires detail::TwoSiteCenterStorageFor<CenterStorage, typename MpsChain::value_type>
auto	uni20::tensor_network::run_two_site_dmrg (MpsChain &mps, MpoChain const &mpo, MpoEnvironmentCache< MpsChain, MpoChain, EnvironmentStorage > &cache, TwoSiteDmrgRunOptions< make_real_t< typename MpsChain::value_type > > const &options={}, CenterStorage center_storage={})
	Run alternating directional sweeps without performance measurements.

template<class MpsChain , class MpoChain , SparseBlockStorage EnvironmentStorage, class Measurements , BlockTensorStorage CenterStorage = typename MpsChain::storage_policy> requires detail::TwoSiteCenterStorageFor<CenterStorage, typename MpsChain::value_type> && performance::DurationMeasurementPolicy<Measurements, TwoSiteDmrgPerformanceEvent>
auto	uni20::tensor_network::sweep_two_site_dmrg (MpsChain &mps, MpoChain const &mpo, MpoEnvironmentCache< MpsChain, MpoChain, EnvironmentStorage > &cache, MpsSweepDirection direction, TwoSiteDmrgOptions< make_real_t< typename MpsChain::value_type > > const &options, Measurements &measurements, CenterStorage center_storage={})
	Traverse every adjacent bond once in one measured two-site DMRG direction.

template<class MpsChain , class MpoChain , SparseBlockStorage EnvironmentStorage, BlockTensorStorage CenterStorage = typename MpsChain::storage_policy> requires detail::TwoSiteCenterStorageFor<CenterStorage, typename MpsChain::value_type>
auto	uni20::tensor_network::sweep_two_site_dmrg (MpsChain &mps, MpoChain const &mpo, MpoEnvironmentCache< MpsChain, MpoChain, EnvironmentStorage > &cache, MpsSweepDirection direction, TwoSiteDmrgOptions< make_real_t< typename MpsChain::value_type > > const &options={}, CenterStorage center_storage={})
	Traverse every adjacent bond once without performance measurements.

constexpr auto	uni20::tensor_network::two_site_dmrg_performance_event_name (TwoSiteDmrgPerformanceEvent event) noexcept -> std::string_view
	Return the stable display name of one DMRG performance event.

Detailed Description

Performs directional finite-chain two-site DMRG updates.

Classes

Namespaces

Typedefs

Enumerations

Functions

Detailed Description