How to evaluate GenAI Summarization results

Hello Testers!  Below, I used LLM to summarize our discussion thread.  How would you rate the LLM summary ?
 

Evaluating GenAI summarization results is a complex task due to the lack of definitive "correct" answers. However, several common evaluation metrics and approaches are used to assess the quality and effectiveness of AI-generated summaries:

Automated Metrics

ROUGE (Recall-Oriented Understudy for Gisting Evaluation)

• Measures overlap between generated and reference summaries using n-grams and sequences.
• ROUGE-N focuses on exact matches, while ROUGE-L evaluates sequence similarity considering sentence structure.

BLEU (Bilingual Evaluation Understudy)

• Originally designed for machine translation, it measures n-gram precision.
• Useful for short texts but struggles with synonyms and paraphrasing.

BERTScore

• Uses contextual embeddings to assess semantic similarity between generated and reference summaries.
• Captures meaning better than surface-level metrics like ROUGE and BLEU.

METEOR

• Considers synonyms and linguistic variations, offering better semantic evaluation than BLEU.

Human Evaluation

Human evaluation remains crucial for assessing subjective aspects of summaries:

• Judges fluency, relevance, conciseness, and faithfulness.
• Provides nuanced insights but can be time-consuming.

Other Evaluation Approaches

QuestEval

• Assesses how well the summary answers questions derived from the source.
• Useful for evaluating faithfulness and informativeness.

Factual Consistency Checks

• Measures the accuracy of factual information retained from the source content.
• Tools like QuestEval and FactCC can assist with this process.

Length-based Metrics

• Evaluates whether the summary adheres to a desired length or compression ratio.

Novelty and Redundancy Analysis

• Assesses whether the summary introduces unnecessary information or repeats content excessively.

Domain-specific Metrics

• Customized metrics for specialized use cases (e.g., legal or medical summaries).

Frameworks and Tools

RAGAS Framework

• Compares AI-generated summaries to ideal answers (Ground Truth).
• Evaluates both retrieval and generation components of the model.
• Key metrics: Answer Relevancy, Accuracy, Completeness, and Harmfulness.

NLGEval and EvalSumm

• Frameworks to streamline evaluations across multiple metrics.

Best Practices

• Combine multiple metrics for a balanced evaluation.
• Use both automated metrics and human evaluation for comprehensive assessment.
• Adjust metrics based on specific use cases and priorities (e.g., accuracy for legal documents, readability for blog summaries).
• Implement regular health checks for LLM and data drift.
• Consider user feedback for iterative improvement.

By utilizing a combination of these metrics and approaches, testers can effectively evaluate GenAI summarization outputs, ensuring both technical quality and user-centric value.

Good stuff, Michael.  How do you some tests for correctness with an automated tool/metric?

I don’t understand the question, nor the context that it would need for an answer.