Evaluations Metric: Answer Similarity

Description

This n8n template demonstrates how to calculate the evaluation metric "Similarity" which in this scenario, measures the consistency of the agent.

The scoring approach is adapted from the open-source evaluations project RAGAS and you can see the source here https://github.com/explodinggradients/ragas/blob/main/ragas/src/ragas/metrics/_answer_similarity.py

How it works
This evaluation works best where questions are close-ended or about facts where the answer can have little to no deviation.
For our scoring, we generate embeddings for both the AI's response and ground truth and calculate the cosine similarity between them.
A high score indicates LLM consistency with expected results whereas a low score could signal model hallucination.

Requirements
n8n version 1.94+
Check out this Google Sheet for a sample data https://docs.google.com/spreadsheets/d/1YOnu2JJjlxd787AuYcg-wKbkjyjyZFgASYVV0jsij5Y/edit?usp=sharing