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RDBStorage trial timestamps depend on process local timezone

bugIssue/PR about behavior that is broken. Not for typos/examples/CI/test but for Optuna itself.Issue/PR about behavior that is broken. Not for typos/examples/CI/test but for Optuna itself.

Status: Open.

#6708 In optuna/optuna;

· jchacks opened on Jun 5, 2026

BUG: NameError in _rank.py when neither plotly nor matplotlib is installed

Status: Open.

#6702 In optuna/optuna;

· devteamaegis opened on Jun 1, 2026

Support fundamental mutation algorithm in GA

featureChange that does not break compatibility, but affects the public interfaces.Change that does not break compatibility, but affects the public interfaces.

Status: Open.

#6695 In optuna/optuna;

· hrntsm opened on May 28, 2026

Why is GPSampler still experimental?

documentDocumentation related.Documentation related.

Status: Open.

#6692 In optuna/optuna;

· nabenabe0928 opened on May 27, 2026

Expose explicit lifecycle API for gRPC storage proxy server

Status: Open.

#6678 In optuna/optuna;

· nateGeorge opened on May 15, 2026

Pruning with multi-objective optimization and skorch

featureChange that does not break compatibility, but affects the public interfaces.Change that does not break compatibility, but affects the public interfaces.

Status: Open.

#6676 In optuna/optuna;

· weberscode opened on May 15, 2026

Add None for Suggest Int and Suggest Float

featureChange that does not break compatibility, but affects the public interfaces.Change that does not break compatibility, but affects the public interfaces.

Status: Open.

#6674 In optuna/optuna;

· PelinV opened on May 15, 2026

Merge order hints regarding the BruteForceSampler speedup PRs

documentDocumentation related.Documentation related.

Status: Open.

#6659 In optuna/optuna;

· nabenabe0928 opened on May 4, 2026

[Feature] Integration of Penta-V Kernel (PVK) for High-Dimensional Optimization Acceleration

featureChange that does not break compatibility, but affects the public interfaces.Change that does not break compatibility, but affects the public interfaces.

Status: Open.

#6658 In optuna/optuna;

· narukihto opened on May 4, 2026

Shouldn't BruteForceSampler have the option to exclude failed trials from the tree build?

documentDocumentation related.Documentation related.

Status: Open.

#6654 In optuna/optuna;

· nabenabe0928 opened on May 4, 2026

[TPE] Premature region abandonment due to unfair co-parameter evaluation in parallel optimization

featureChange that does not break compatibility, but affects the public interfaces.Change that does not break compatibility, but affects the public interfaces.

Status: Open.

#6623 In optuna/optuna;

· aditirani opened on Apr 11, 2026

Use fixed parameter information for acquisition function evaluations when usingPartialFixedSampler

featureChange that does not break compatibility, but affects the public interfaces.Change that does not break compatibility, but affects the public interfaces.

Status: Open.

#6620 In optuna/optuna;

· nabenabe0928 opened on Apr 8, 2026