Evaluation metric example: Correctness (judged by AI)

Description

AI evaluation in n8n

This is a template for n8n's evaluation feature.

Evaluation is a technique for getting confidence that your AI workflow performs reliably, by running a test dataset containing different inputs through the workflow.

By calculating a metric (score) for each input, you can see where the workflow is performing well and where it isn't.

How it works

This template shows how to calculate a workflow evaluation metric: whether an output matches an expected output (i.e. has the same meaning).

The workflow takes questions about the causes of historical events and compares them with the reference answers in the dataset.

We use an evaluation trigger to read in our dataset
It is wired up in parallel with the regular chat trigger so that the workflow can be started from either one. More info
If we're evaluating (i.e. the execution started from the evaluation trigger), we calculate the correctness metric using AI
We pass this information back to n8n as a metric
If we're not evaluating we avoid calculating the metric, to reduce cost