rust-optimizer/CHANGELOG.md

Changelog

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

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

0.9.1 - 2026-02-12

Fixed

• Fix journal file handling to support both reading and writing modes

0.9.0 - 2026-02-12

Added

• Storage trait abstraction with pluggable backends
• JSONL journal storage backend for persistent studies (behind journal feature)
• Differential Evolution sampler
• Gaussian Process sampler with Expected Improvement acquisition function
• NSGA-III sampler for many-objective optimization with reference-point decomposition
• MOEA/D sampler for decomposition-based multi-objective optimization
• StudyBuilder for fluent study construction

Changed

• Move next_trial_id counter from Study into Storage trait
• Replace rand 0.10 with fastrand 2.3 for simpler, faster random number generation
• Remove visualization and fanova feature flags (now always available)
• Simplify CI test commands by removing feature matrix

Fixed

• Seed importance tests to eliminate flakiness
• Use atomic counter for temp paths in journal tests

Removed

• Reverted SQLite storage backend (may return in a future release)

0.8.1 - 2026-02-11

Fixed

• Resolve broken rustdoc intra-doc links for Error::NoCompletedTrials

0.8.0 - 2026-02-11

Added

• Multi-objective optimization with NSGA-II
• Multi-Objective TPE (MOTPE) sampler
• Pareto front analysis utilities
• CSV and JSON data export for visualization
• HTML visualization reports with Plotly.js charts
• fANOVA (functional ANOVA) parameter importance via random forest

Fixed

• Rename variable to pass typos check

0.7.2 - 2026-02-11

Changed

• Update nalgebra dependency to version 0.34
• Add advisory ignore for unmaintained transitive dependency

0.7.1 - 2026-02-11

Changed

• Update tracing dependency to version 0.1.29

0.7.0 - 2026-02-11

Added

• CMA-ES (Covariance Matrix Adaptation Evolution Strategy) sampler behind cma-es feature flag
• Sobol quasi-random sampler behind sobol feature flag
• BOHB (Bayesian Optimization with HyperBand) sampler for budget-aware optimization
• Parameter importance analysis via Spearman rank correlation
• Constraint handling with feasibility-aware trial ranking
• optimize_with_retries() for automatic retry of failed trials
• optimize_with_checkpoint() with atomic save writes for crash recovery
• Study::summary() and Display impl for study overview
• IntoIterator for &Study and iter() method
• Tracing integration behind tracing feature flag
• Serde serialization support behind serde feature flag
• Benchmark suite with criterion and standard test functions

0.6.0 - 2026-02-11

Added

• Pruning system with Pruner trait and NopPruner default implementation
• Intermediate value reporting on trials for pruner integration
• TrialPruned error variant and Pruned trial state
• ThresholdPruner for fixed-bound trial pruning
• MedianPruner for statistics-based trial pruning
• PercentilePruner for configurable percentile-based trial pruning
• PatientPruner for patience-based trial pruning
• SuccessiveHalvingPruner for SHA-based trial pruning
• HyperbandPruner for multi-bracket trial pruning
• WilcoxonPruner for statistics-based trial pruning
• Study::minimize() and Study::maximize() constructor shortcuts
• From<RangeInclusive> for FloatParam and IntParam
• Timeout-based optimization with optimize_until
• Study::top_trials(n) for retrieving the best N trials
• Ask-and-tell interface with ask() and tell() methods
• Trial user attributes for logging and analysis
• enqueue_trial() for pre-specified parameter evaluation

0.5.1 - 2026-02-10

Changed

• Update random number generation to use rand::make_rng() and upgrade rand to version 0.10

0.5.0 - 2026-02-06

Added

• Typed parameter API with FloatParam, IntParam, CategoricalParam, BoolParam, and EnumParam
• #[derive(Categorical)] proc macro for deriving categorical parameters from enums (behind derive feature)
• .name() builder method on all parameter types for custom labels
• CompletedTrial::get() for typed parameter access
• Display impl on ParamValue
• Prelude module at optimizer::prelude::*

Changed

• Reorganize sampler module structure and update imports
• Remove log dependency

0.4.0 - 2026-02-02

Added

• Multivariate TPE sampler for correlated parameter search
• Gamma strategies for TPE sampler (linear, sqrt, fixed) with examples
• Example: async API parameter optimization
• Example: ML hyperparameter tuning

Fixed

• Handle end value in suggest method to avoid panic on underflow

0.3.1 - 2026-01-31

Added

• Grid search sampler for exhaustive parameter exploration
• suggest_bool() method for boolean parameter suggestion
• SuggestableRange trait and suggest_range() method for parameter suggestion from ranges
• Documentation, keywords, categories, and readme fields in Cargo.toml

Changed

• Replace TpeError with unified Error type across the library
• Add permissions for read access to contents in CI and scheduled workflows

0.3.0 - 2026-01-30

Added

• Cross-target compilation checks in CI

Changed

• Internal code refactoring and cleanup

0.2.0 - 2026-01-30

Added

• CI step for unused dependencies check with cargo-machete
• CI step to publish to crates.io
• Default typo extension for 'Tpe'

Changed

• Remove serde dependency (was unused)
• Remove unused ordered-float dependency

0.1.1 - 2026-01-30

Fixed

• Minor release fixes

0.1.0 - 2026-01-30

Added

• Initial implementation of the optimization library
• TPE (Tree-structured Parzen Estimator) sampler with optional fixed bandwidth KDE
• Random sampler
• Async optimization support
• CI workflows for testing, coverage (Codecov), auditing, and publishing
• README with project overview, features, and quick start guide

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Release Workflow

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1. Write commits using Conventional Commits (feat:, fix:, refactor:, etc.).
2. Tag the release: git tag v0.X.0
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