The `explanation` field in `EvaluationResult` is surfaced in the Phoenix UI as part of the evaluation results for experiments and annotations. When you run experiments or log evaluations, the UI displays the explanation alongside the label and score for each evaluated example, allowing users to drill down into individual cases and understand why a particular label was assigned by the evaluator. This is visible in the experiment results table and in the detailed view for each example or span in the UI, as shown in the <https://arize.com/docs/phoenix/evaluation/evals-with-explanations|Phoenix documentation> and confirmed by the <https://github.com/Arize-ai/phoenix/blob/main/docs/user-guide.md|user guide>.
Would you like more detail on how to access or visualize these explanations in the UI?
Sources:
- <https://github.com/Arize-ai/phoenix/blob/main/docs/user-guide.md|user guide>
