CHANGELOG.md

Change Log

All notable changes to this project will be documented in this file.

Unreleased

v1.21.1- 2023-06-09

This release brings experimental async-evolution with other improvements.

Changed

• update dependencies
• fix documentation issues
• refactor HeuristicContext trait to avoid using HeuristicPopulation directly from it
• improve non-determinism based selectors logic

Added

• add experimental feature async-evolution

v1.21.0- 2023-04-27

This release brings hierarchical approach for local objective estimation. Additionally, it focuses on refactoring, mostly to avoid usafe code. In memory of..

Changed

• use hierarchical approach for local objective estimation
• avoid unsafe code project-wise:
  • apply #![forbid(unsafe_code)] directive for rosomaxa/vrp-core/vrp-pragmatic/vrp-scientific
  • apply #![deny(unsafe_code)] directive for vrp-cli (due to FFI which is only one exception)
  • allow unsafe code only when necessary in research crates which are not used anyhow in production code
• make pyo3 an optional dependency and wrap python bindings under py_bindings feature
• refactor Deref trait usage
• implement Debug for essential core types
• refactor job index to lower memory footprint for a large scale VRP (tested on 30k CVRP instance)
• use proper objective for tsplib format problems (CVRP)
• error handling types
• fix sort stability issue in elitism's improvement detection method
• switch rosomaxa learning rate to cosine annealing
• rename shiftTime limit to maxDuration

Added

• experimental compact-tour objective which tries to shape routes based on job neighbourhood.
• heuristic filtering extension
• simple tabu list implementation used by some ruin methods
• gene pool in rosomaxa to reintroduce some genes while search progresses

v1.20.0- 2023-04-01

This release is focused on removing unsafe code from the solver core.

Changed

• refactor RouteContext to avoid using Arc and unsafe code
• refactor Network to avoid using Arc/RwLock and, as result, unsafe code in consumers
• adapt core api to required safety changes

v1.19.2 - 2023-03-22

This release introduces improvements in rosomaxa-heuristic.

Added

• python binding with pyo3
• example how to use library with maturin

Changed

• cleaned area leftovers
• update dependencies
• update rust version on dev environment to 1.68
• fix clippy warnings
• bug fix in capacity feature
• change gsom compaction logic and adapt rosomaxa

v1.19.1 - 2022-12-14

Changed

• breaking: replace LegSelector with LegSelectionMode
• use different approach for leg selection: selection sampling search
• introduce initial weights in dynamic heuristic
• update dependencies
• update rust version on dev environment to the latest (1.65.0)

v1.19.0 - 2022-10-16

This release is focused on internal design improvements with some performance implications.

Changed

• breaking: combine objectives and constraint modules into feature concept
• improve ruin limits logic
• change insertion position evaluation logic to speedup analysis
• update dependencies
• update rust version used for development (1.64)

Removed

• breaking: remove area constraint as it needs rework

v1.18.4 - 2022-08-21

Changed

• breaking: simplify unassigned job reason model
• fix capacity violation issue related to reload feature

v1.18.3 - 2022-08-10

Added

• add shared resource constraint for vehicle reload. Essentially, it is a limit for amount of deliveries picked from specific reload places.

Changed

• improve obsolete reload removal logic
• improve groups constraint
• refactor heuristic research crate

v1.18.2 - 2022-07-12

Added

• RedistributeSearch heuristic
• diversify method to hyper-heuristics to increase population diversity when search stagnates

Changed

• use experimental mode to print dynamic heuristic statistics
• random trait internals
• refactor multi trip functionality
• use faster hash builders inside RouteState and Dimensions
• update dependencies

v1.18.1 - 2022-05-13

Added

• expose more than one reason of job unassignment. This should give more information why job was not assigned to existing tours.

Changed

• adapt weights in heuristics

v1.18.0 - 2022-05-07

This release focuses on performance improvements.

Changed

• adapt RosomaxaWeighted interface for weight caching
• modify MDP reward of heuristic based on its execution time
• breaking: use SmallRng as faster alternative to StdRng and avoid initialization on each usage
• improve slow search detection logic
• update dependencies

Fixed

• fix issue: telemetry metrics are not included in solution file
• fix issue: capacity violation in rare cases when multi-jobs are used

Added

• WorstRouteRemoval: removes routes with the smallest amount of jobs

Removed

• remove MultiSelective and use DynamicSelective by default

v1.17.0 - 2022-04-25

This release focuses on internal algorithm improvements in direction of predictability.

Changed

• upgrade to 1.60 rust
• fix tour order issue related to break/reload activities
• fix limit violation issue in specific use cases
• improve rosomaxa and customized GSOM implementation
• use a new Arc::new_cyclic method to bind multi-single jobs
• fix regression in runtime performance related to greediness of SWAP* heuristic implementation

Added

• heuristic research playground with algorithm visualizations capabilities

v1.16.1 - 2022-03-10

Added

• stopping by terminal signal
• minimize-arrival-time objective to prefer solutions where work is finished earlier.

v1.16.0 - 2022-03-03

Changed

• breaking: add required break functionality (experimental)
• update dependencies

v1.15.0 - 2022-02-15

Changed

• breaking: rework area constraint

v1.14.0 - 2022-01-23

Changed

• breaking: extract rosomaxa crate with generalized heuristic implementation
• update dependencies

v1.13.0 - 2021-12-05

Added

• add compatibility property to the job definition
• add new local search operator based on SWAP* algorithm

Changed

• migrate to 2021 edition
• update dependencies
• remove dependency on chrono in favor of time
• use variable strategy for leg insertion analysis
• adjust route removal ruin methods to limit a bit amount of removed jobs
• order of initial heuristics

v1.12.0 - 2021-11-16

Added

• a new local search operator: exchange sequence
• a vicinity job clustering: group close jobs in the same stop and visit them differently

Changed

• update dependencies
• bug fixes

v1.11.5 - 2021-09-27

Added

• a limited support for TSPLIB95 format
• more validation rules for objective usage

Changed

• change defaults for initial solution building logic
• improve rosomaxa algorithm
• improve tour order objective logic
• update dependencies

v1.11.4 - 2021-09-10

Changed

• fix a memory leak
• update dependencies

v1.11.3 - 2021-09-07

Added

• analyze clusters command to cli
• break policy property
• a penalty property for skipping break in maximize-value objective

Changed

• improve clustering removal heuristic
• enhance rules for slow search detection and reduce search radius in case of it
• improve unassigned jobs handling logic
• update dependencies

v1.11.2 - 2021-08-22

Added

• group constraint on job in pragmatic format

v1.11.1 - 2021-08-17

Added

• slice recreate method

Changed

• breaking: move tag from task to place level in pragmatic format
• breaking: adjust break definition to be consistent with job
• update dependencies

v1.11.0 - 2021-08-08

Added

• a metaheuristic which searches in infeasible solution space
• logic to swap objective with some small probability in rosomaxa algorithm

Changed

• refactor logging configuration
• change metaheuristic coefficients

v1.10.8 - 2021-07-21

Changed

• validation rule for any relation

v1.10.7 - 2021-07-12

Added

• export validation function

v1.10.6 - 2021-06-27

Added

• logging prefix in config

Changed

• minor changes in core logic

v1.10.5 - 2021-06-20

Changed

• finalize tour order implementation and make it work on job place level
• minor improvements in pragmatic format logic
• update dependencies

Removed

• undocumented hre format

v1.10.4 - 2021-05-15

Added

• pre/post processing steps for problem and solution
• optimization which moves backward departure time
• coefficient of variation termination criteria is extended to support time period

Changed

• do not always try to move forward departure time

v1.10.3 - 2021-05-03

Added

• new recreate method: RecreateWithSkipRandom

Changed

• min-cv can be used in exploration search phase
• improve rosomaxa algorithm

v1.10.2 - 2021-04-28

Changed

• introduce min-cv parameter instead of cost-variation
• improved stability of some tests
• bug fixes

Removed

• cost-variation parameter

v1.10.1 - 2021-04-20

Changed

• breaking: rename job's priority property to order
• change default objective behaviour when value property is used

v1.10.0 - 2021-04-02

This release has breaking changes in pragmatic format and internal apis.

Added

• new objectives: minimize-distance and minimize-duration
• new CLI option: init-size to control amount of initial solutions to be built built
• travelling duration scale on vehicle profile: it can be used to adjust durations for specific vehicle type

Changed

• optimize cluster ruin method
• improve unassigned code reason handling
• breaking: convert profile property on vehicle type to an object

Removed

• type property from matrix profile

v1.9.1 - 2021-03-24

Added

• maximize value objective

Changed

• build multiple initial solutions

v1.9.0 - 2021-03-19

Changed

• use dynamic hyper-heuristic by default
• flatten objective functions definition
• rebalance coefficients of recreate methods
• reduce default population selection size

v1.8.1 - 2021-02-26

Added

• a new ruin method which destroys closest routes
• more solution checker rules

Changed

• rebalance ruin methods

Fixed

• fix an issue with huge amount of possible permutations in multi job

v1.8.0 - 2021-02-07

Added

• a new mutation operator: decompose search which is used for bigger problem instances
• a new population type: greedy
• breaking: introduced hyper-heuristic model
• an experimental dynamic selective hyper-heuristic (WIP)

Changed

• speedup processing of unassigned jobs

v1.7.4 - 2021-01-23

Changed

• introduced parallelism control options (experimental).

v1.7.3 - 2021-01-08

Changed

• update hre format support to v2 version
• update dependencies

v1.7.2 - 2020-12-05

Changed

• update dependencies
• apply minor algorithm changes

v1.7.1 - 2020-11-29

This release focuses on improving performance and bug fixing.

Changed

• use stale flag internally to avoid route state updates on non-changed routes

Removed

• remove unstable push tour departure LS method

v1.7.0 - 2020-11-23

This release features a new solution space exploration algorithm called ROSOMAXA: Routing Optimizations with Self Organizing MAps and eXtrAs (pronounced as "rosomaha", from russian "росомаха" - "wolverine").

Added

• add and use by default rosomaxa algorithm
• add a new LS method to push tour departure in the future
• add a Local Search mutation
• add farthest insertion heuristic

Changed

• move Local Search out of Ruin Recreate mutation
• breaking: use string as unassigned job reason code

v1.6.4 - 2020-10-27

Added

• tour size constraint which limits amount of job activities per tour

v1.6.3 - 2020-10-21

Added

• introduce dispatch feature to support vehicle dispatching functionality (depot replacement)

Removed

• breaking: removed depot feature

Changed

• ExchangeIntraRouteRandom now removes and reinserts with noise a single random job

v1.6.2 - 2020-10-18

Changed

• breaking: job skills are now defined by allOf, oneOf and noneOf conditions
• use hashbrown library in pragmatic crate
• fixed minor bugs

Removed

• config property from pragmatic format

v1.6.1 - 2020-10-15

Added

• breaks property in minimize-unassigned objective
• dependencies audit by github actions

Changed

• break assignment is made less strict by default. User has certain control on its assignment by the objective
• replaced uniform_real(0., 1.) usage with is_hit method in Random trait
• default parameters of local search operators

Fixed

• minor tech debt

v1.6.0 - 2020-10-14

Added

• cargo features to build cli library without certain dependencies
• proper k-regret recreate method
• recreate-with-perturbation recreate method
• add local search operators to ruin recreate mutation:
  • inter route best
  • inter route random
  • intra route random

Changed

• renamed regret to skip-best method

Fixed

• some issues in init readers

v1.5.0 - 2020-09-07

Added

• accept location indices for routing matrix

Changed

• do not generate initial solutions when initial solution supplied

Fixed

• ruin bug with zero-cost jobs
• population size performance issue
• incorrect checker expectations regarding vehicleId template

v1.0.0 - 2020-04-09

• Initial public release

v0.0.1 - 2019-08-26

• Initial commit