Integrating Artificial Intelligence (AI) into software systems has significantly enhanced their capabilities while escalating energy demands. Ensemble learning, combining predictions from multiple models to form a single prediction, intensifies this problem due to cumulative energy consumption.

This paper presents a novel approach to model selection that addresses the challenge of balancing the accuracy of AI models with their energy consumption in a live AI ensemble system. We explore how reducing the number of models or improving the efficiency of model usage within an ensemble during inference can reduce energy demands without substantially sacrificing accuracy.

This study introduces and evaluates two model selection strategies, Static and Dynamic, for optimizing ensemble learning systems' performance while minimizing energy usage. Our results demonstrate that the Static strategy improves the F1 score beyond the baseline, reducing average energy usage from 100% from the full ensemble to 62%.
The Dynamic strategy further enhances F1 scores, while using on average 76% compared to 100% of the full ensemble.

Moreover, we propose an approach that balances accuracy with resource consumption, significantly reducing energy usage without substantially impacting accuracy. This method decreased the average energy usage of the Static strategy from approximately 62% to 14%, and for the Dynamic strategy, from around 76% to 57%.

Our field study of Green AI using an operational AI system developed by a large professional services provider shows the practical applicability of adopting energy-conscious model selection strategies in live production environments.

TestCube amplifies existing unit tests and creates a new test suite with additional coverage for the source code. The names automatically generated by TestCube do not give any information on the behaviour or the coverage improvement of the amplified test case. In this paper, we present an approach to naming these amplified test cases by representing methods where the coverage is improved. These tests represent the covered methods on source code level and give the developer increased readability and understanding of the amplified test cases. We conducted a research study amongst 16 participants with a background in Computer Science. Participants were asked to indicate their agreement with the original test names, the test names generated by the approach and test names written by experts. The study found that participants strongly disagreed with the original TestCube names, and the names generated by our approach posed a real improvement to their satisfaction with the test names. With a few improvements, the test names generated by the approach will perform as acceptable as the manually written names.