feat(genai): Update tuning samples to include automatic evaluations

[lakeyk]

feat(genai): Update tuning samples to include automatic evaluations

Description

Fixes #430697448

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• Please merge this PR for me once it is approved

[gemini-code-assist]

Summary of Changes

Hello @lakeyk, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the 'create tuning job' functionality by integrating automatic evaluation capabilities. It introduces new parameters for validation datasets and evaluation configurations, allowing users to define metrics and output destinations for automated model performance assessment. The API version has also been updated to v1beta1 to support these new features.

Highlights

• Automatic Evaluation: Enabled automatic evaluation for tuning jobs by introducing evaluation_config.
• Validation Dataset Support: Added support for specifying a validation_dataset during tuning job creation.
• API Version Upgrade: Migrated the API client version from v1 to v1beta1 to access newer features.
• Configurable Metrics: Allowed definition of evaluation metrics, such as 'FLUENCY', within the evaluation_config.
• GCS Output for Evaluation: Configured the output of evaluation results to a specified GCS bucket.

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[gemini-code-assist]

Code Review

This pull request updates the tuning job creation samples to include automatic evaluation. The changes introduce new functionality, but I've found a couple of critical issues in both modified files that would prevent the code from running: a missing import for the Metric class and an undefined USER_GCS_FOLDER variable. I've also left a minor comment about indentation to improve code style according to PEP 8. Please address these points to ensure the samples are correct and runnable.

[inardini]

LGTM

[msampathkumar]

LGTM