[Bug]: Gemini evaluation: string format error and missing class definition

[pepecura]

File Name

https://github.com/GoogleCloudPlatform/generative-ai/blob/main/gemini/evaluation/get_started_with_genai_model_eval_service.ipynb

What happened?

1. The string prompt_end gives an error in "Evaluate prompt engineering using locally-defined custom metrics" section. The fix: Add f at the beginning of first prompt_end and delete the fourth quotation mark at the end of the second prompt_end.
2. Cosmetics: Delete from BUCKET_URI definition.
3. Metric list gives an error in "Validate prompt by comparing LLM 1 with LLM 2". The fix: Delete rouge_1 and rouge_2 from metrics.
4. class EvaluationTextSummarizationSpec in "Using Vertex AI Model Evaluation Computation-based metrics" is not imported from language_models and gives an error. It doesn't exist in this version of the module (it is in preview).
   Thanks!

Relevant log output

No response

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