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Could the kernel parameter prior be better?

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

needs-discussionIssue/PR which needs discussion.Issue/PR which needs discussion.

Status: Open.

#6255 In optuna/optuna;

· nabenabe0928 opened on Aug 20, 2025

NSGAII Sampler Pareto Front Logic inconsistency

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.

#6242 In optuna/optuna;

· dan8239 opened on Aug 8, 2025

<code>GPSampler</code> suddenly slows down once <code>n_trials</code> hits exactly 100

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.

#6230 In optuna/optuna;

· nabenabe0928 opened on Aug 1, 2025

Filter out incompatible hyperparameters

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

Status: Open.

#6212 In optuna/optuna;

· fabiom91 opened on Jul 22, 2025

Explain how the penalization of constriant-violating trial works

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

Status: Open.

#6196 In optuna/optuna;

· 1kastner opened on Jul 8, 2025

Save used sampler for each parameter in Trial

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

Status: Open.

#6185 In optuna/optuna;

· 1kastner opened on Jun 29, 2025

Improve CI/CD by migrating config files to pyproject.toml

code-fixChange that does not change the behavior, such as code refactoring.Change that does not change the behavior, such as code refactoring.

Status: Open.

#6173 In optuna/optuna;

· ParagEkbote opened on Jun 20, 2025

GPSampler crashes when torch default device is cuda

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.

#6113 In optuna/optuna;

· argusdusty opened on May 31, 2025

The test <code>test_parallel_optimize_with_sleep</code> eventually fails

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.

#6095 In optuna/optuna;

· HideakiImamura opened on May 27, 2025

Feature Request: Add Dark Mode Toggle to Documentation

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

Status: Open.

#6093 In optuna/optuna;

· Ashish-Pandey62 opened on May 26, 2025

Support Multi-Node DDP with Lightning

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

Status: Open.

#6091 In optuna/optuna;

· LarsKue opened on May 25, 2025

RetryFailedTrialCallback not working?

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.

#6085 In optuna/optuna;

· Sebastian-0 opened on May 22, 2025