The Importance of Evaluation
Evaluators are essential tools for measuring LLM output quality. When you have a reliable way to measure quality, it becomes much easier to:- Compare different LLM models
- Test prompt variations
- Validate feature additions
- Ensure quality remains consistent during upgrades
Types of Evaluators
On the video, a few evaluators are introduced:Exact Match Evaluator (0:56)
The simplest form of evaluation, perfect for classification tasks:- Compares LLM output directly with expected output
- Uses straightforward string matching
- Ideal for categorical outputs where precision is crucial
- Works well when you need strict matching
Answer Correctness Evaluator (4:44)
Comparison with golden answers for factual accuracy:- Uses another LLM to assess if answers are factually equivalent
- Looks beyond exact wording to evaluate semantic meaning
- Particularly useful for QA systems and knowledge-based tasks
- Can handle variations in phrasing while maintaining accuracy checking
LLM as Judge Evaluator (7:01)
Flexible evaluation for custom criteria:- Allows custom prompts to define evaluation criteria
- Useful when you donβt have expected outputs
- Can evaluate subjective qualities (conciseness, tone, style)
- Returns boolean (true/false) or scored (0-1) results
Working with Evaluators
Setting Up Evaluators (1:32)
To implement an evaluator:- Drag and drop the desired evaluator onto your workflow
- Connect appropriate inputs (output from LLM, expected output from dataset)
- Configure any additional parameters or criteria
- Run evaluation on individual examples or full test sets
Running Evaluations (2:28)
The evaluation process:- Select your test dataset
- Choose appropriate evaluator
- Run evaluation across all test examples
- Review accuracy scores and individual results
Improving Results (9:14)
After setting up evaluation:- Make incremental changes to your workflow
- Test impact immediately through re-evaluation
- Track improvements in accuracy scores
- Iterate on prompts and parameters based on results
Summary
- Choose evaluators that match your quality criteria
- Use multiple evaluators for different aspects of quality
- Start with simple evaluators before moving to complex ones
- Consider both strict and semantic matching depending on your use case
- Use evaluation results to guide optimization efforts