# Property Finder Enhances Model Accuracy and Efficiency on Amazon Bedrock

> Discover how Property Finder tackled evaluation bias during their transition to Amazon Bedrock, uncovering a pathway to enhanced accuracy and efficiency in AI model assessment. This case study reveals critical lessons for businesses relying on AI in competitive markets.

**Source**: aws.amazon.com | **Published**: 2026-10-27 | **Type**: case_study

## Key Facts

- Property Finder's model bias skewed 96.8% of evaluation labels, hindering objective comparisons.
- Switching to Llama 4 Maverick 17B improved accuracy from 0.55 to 0.80, a 47% performance gain.
- Cost per 1,000 images dropped to $2.35, achieving an 86% reduction compared to previous methods.
- Inference latency reduced by 40-60%, enhancing operational efficiency for processing images daily.
- Multi-label classification improved accuracy by allowing overlapping attributes, reducing ambiguity in results.

## Summary

\## Summary
Property Finder, a digital real estate application, faced significant evaluation bias in their image processing models, which skewed their assessment of model performance. By migrating to Amazon Bedrock and implementing a new unbiased evaluation methodology, they achieved a 47% increase in accuracy while reducing costs by 86%. This transformation allowed them to process property images more effectively across the MENA region.

\## Background
Property Finder operates in the real estate industry and processes tens of thousands of property images daily across the Middle East and North Africa (MENA). Before deploying the new solution, their evaluation labels were primarily derived from a single model’s predictions, leading to a biased assessment of model performance. This reliance on flawed labels hindered their ability to objectively compare alternative models.

\## Challenge
The primary challenge was the evaluation bias caused by using predictions from an existing model as ground truth. This circular evaluation process made it difficult to assess the performance of new models accurately, as they were unfairly judged against the incumbent's outputs.

\## Solution
To address the evaluation bias, Property Finder's team built an unbiased ground truth by having human experts independently annotate a new dataset of 356 UAE images. They transitioned from a single-label to a multi-label classification system, allowing for more accurate assessments of images that displayed multiple attributes. The team then utilized Amazon Bedrock to implement evolutionary prompt optimization, iterating through 27 versions of prompts to refine model performance.

\## Results
The implementation of the new evaluation framework and model optimization led to a Micro F1 score increase from 0.55 to 0.80 on the evaluation set. This represented a 47% relative gain in accuracy. Additionally, the estimated cost per 1,000 images dropped to $2.35, an 86% reduction compared to their previous setup. Property Finder also observed a 40–60% reduction in inference latency with the new system.

\## Key Insights
Organizations should audit their evaluation labels to ensure they are not biased by existing model predictions. Building a ground truth with domain experts and adopting multi-label metrics can significantly improve model assessments. Iterative prompt optimization, informed by error analysis, is crucial for enhancing model performance.

\## Customer Testimonial
No direct quote was provided in the source material.

## Entities

- **Companies**: Property Finder, Amazon Bedrock, AWS Generative AI Innovation Center, Meta
- **Products**: Llama 4 Maverick 17B Instruct, DSPy
- **Technologies**: vision AI, multi-label classification, Micro F1, reinforcement learning, prompt optimization
- **People**: Khaled Thabit, Meriem Boughrara, Mohamed Desouky, Yousuf Albannai, Amine Sehili, Thomas Ounnas, Aris Tsakpinis, Rafik Soliman, Nikhil Ulhas Pandit, Sneh Sharma

## Key Concepts

evaluation bias, ground truth, model comparison, prompt optimization, human annotation, cost efficiency, image classification, AWS infrastructure

## Definitions

- **evaluation bias**: A systematic error in the evaluation process that skews results, often due to reliance on model predictions instead of independent human verification.
- **ground truth**: The accurate and verified data used as a benchmark for evaluating model predictions, ideally annotated by human experts.
- **Micro F1**: A performance metric that calculates the harmonic mean of precision and recall, treating each prediction equally, which is useful for evaluating classification tasks.
- **multi-label classification**: A classification task where each instance can be assigned multiple labels, allowing for more nuanced categorization of complex data.
- **reinforcement learning**: A type of machine learning where an agent learns to make decisions by receiving rewards or penalties based on its actions.

## Use Cases

- Evaluating property images for quality attributes
- Building unbiased evaluation frameworks for AI models
- Optimizing image classification tasks using prompt tuning
- Reducing costs in image processing workflows
- Improving model accuracy through iterative feedback
- Implementing responsible AI controls in model outputs

## Frequently Asked Questions

**What is evaluation bias and how does it affect model performance?**

Evaluation bias occurs when the evaluation dataset is skewed, often because it relies on outputs from an existing model. This can lead to misleading conclusions about a model's performance, as alternatives may appear to underperform due to biased labels.

**How can I build a reliable ground truth for my AI models?**

To create a reliable ground truth, involve human experts to annotate data independently, without referencing previous model outputs. This ensures that the labels reflect actual correctness rather than the biases of existing models.

**What are the benefits of using multi-label classification?**

Multi-label classification allows models to assign multiple labels to an instance, which is particularly useful in scenarios where data can belong to more than one category. This approach reduces ambiguity and improves the accuracy of predictions.

**How does prompt optimization improve model accuracy?**

Prompt optimization involves refining the instructions given to models to enhance their performance. By iteratively testing and adjusting prompts based on error analysis, models can achieve higher accuracy in classification tasks.

**What role does Amazon Bedrock play in model evaluation?**

Amazon Bedrock provides a platform for accessing multiple AI model families through a single API, facilitating unbiased evaluation and model selection. It supports the integration of new models without requiring significant infrastructure changes.

## Links

- [Read on Welcome.AI](https://welcome.ai/content/property-finder-enhances-model-accuracy-and-efficiency-on-amazon-bedrock)
- [Original source](https://aws.amazon.com/blogs/machine-learning/fix-evaluation-bias-to-unlock-better-models-on-amazon-bedrock/)

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Source: Welcome.AI | https://welcome.ai/content/property-finder-enhances-model-accuracy-and-efficiency-on-amazon-bedrock