Package jline.solvers.tr

Class ChainsStrategy

java.lang.Object

jline.solvers.tr.ChainsStrategy

All Implemented Interfaces:

TransformSolve.Strategy

public class ChainsStrategy
extends Object
implements TransformSolve.Strategy

Chain-aggregation strategy for TransformSolve.

Collapses every chain onto a single class, class switching disappearing with it, solves that model with the CALLER'S OWN solver, and maps the chain metrics back onto the classes through alpha, the per-station share of the chain's visits each class carries.

WHAT IS TRADED. The aggregation is EXACT on a product-form model: the chain is the unit MVA and convolution already solve in, and the deaggregation is the same alpha-weighted split those solvers apply. It is an APPROXIMATION otherwise, because one aggregate service law, fitted to the alpha-weighted first two moments, replaces the per-class ones. A caller who needs the exact multiclass answer leaves the transform off and pays the state space.

SINGLE PASS: one solve of the aggregate determines the answer, so the context is not iterated and couple/converged are never called.

Mirrors MATLAB solver_tr_chains_analyzer.m and python transform_driver._chains_strategy.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	ChainsStrategy.ChainsContext	Carries what the deaggregation needs from the aggregation.

Constructor Summary

Constructors

Constructor	Description
ChainsStrategy()

Method Summary

Modifier and Type	Method	Description
boolean	converged(TransformSolve.Expanded ctx, List<TransformSolve.Inner> res, int it)	True when the sweep may stop.
TransformSolve.Expanded	couple(TransformSolve.Expanded ctx, List<TransformSolve.Inner> res, int e)	Updates the subproblems from the sweep so far.
TransformSolve.Expanded	expand(Network model, NetworkStruct sn, SolverOptions options)	Builds the subproblems and the context the lift will need.
TransformSolve.Lifted	lift(TransformSolve.Expanded ctx, List<TransformSolve.Inner> res)	Maps the subproblem metrics back onto the original model.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ChainsStrategy

public ChainsStrategy()

Method Details

expand

public TransformSolve.Expanded expand(Network model,
 NetworkStruct sn,
 SolverOptions options)

Description copied from interface: TransformSolve.Strategy

Builds the subproblems and the context the lift will need.

Specified by:

expand in interface TransformSolve.Strategy

lift

public TransformSolve.Lifted lift(TransformSolve.Expanded ctx,
 List<TransformSolve.Inner> res)

Description copied from interface: TransformSolve.Strategy

Maps the subproblem metrics back onto the original model.

Specified by:

lift in interface TransformSolve.Strategy

couple

public TransformSolve.Expanded couple(TransformSolve.Expanded ctx,
 List<TransformSolve.Inner> res,
 int e)

Description copied from interface: TransformSolve.Strategy

Updates the subproblems from the sweep so far. Called only by an iterated strategy, immediately after each subproblem's solve, which is what makes the coupling Gauss-Seidel.

Specified by:

couple in interface TransformSolve.Strategy

converged

public boolean converged(TransformSolve.Expanded ctx,
 List<TransformSolve.Inner> res,
 int it)

Description copied from interface: TransformSolve.Strategy

True when the sweep may stop. Called only by an iterated strategy.

Specified by:

converged in interface TransformSolve.Strategy