The Tone Evaluator is a specialized tool designed to assess the similarity in tone and style between an actual response and an expected response. It uses an LLM (Large Language Model) as a judge to determine how well the tone, formatting, and formality of responses match, without considering the actual content or information provided.

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Purpose

The Tone Evaluator is particularly useful when you need to:
  • Ensure consistent communication style across responses
  • Maintain appropriate formality levels in automated responses
  • Verify proper formatting and presentation of information
  • Check for inappropriate use of emojis or special characters
  • Maintain brand voice consistency in automated communications

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How It Works

The evaluator uses a 5-point scale to rate responses:
  • Score: 1 (Inappropriate Characters): The actual response contains emojis or offensive characters not used in the expected response
  • Score: 2 (Extreme Differences): The actual response presents extreme differences in both formatting and formality
  • Score: 3 (Significant Differences): The actual response presents extreme differences in either formatting or formality
  • Score: 4 (Minor Differences): The actual response does not present extreme differences in formatting or formality
  • Score: 5 (Similar Tone): The actual response is similar in tone and complexity compared to the expected response

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Usage Example

import asyncio

from trusttest.evaluation_contexts import ExpectedResponseContext
from trusttest.evaluators import ToneEvaluator


async def evaluate():
    evaluator = ToneEvaluator()
    result = await evaluator.evaluate(
        response="The capital of Osona is Vic! 🎉",
        context=ExpectedResponseContext(
            expected_response="The capital of Osona is Vic."
        )
    )
    print(result)

if __name__ == "__main__":
    asyncio.run(evaluate())
The evaluator returns a tuple containing:
  • A score (1-5) indicating the level of tone similarity
  • A list of explanations for the given score

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When to Use

Use the Tone Evaluator when you need to:
  • Ensure consistent communication style in customer service responses
  • Maintain professional tone in business communications
  • Verify appropriate use of formatting and special characters
  • Check for consistency in automated response systems
  • Evaluate the style and presentation of AI-generated content