Exposição Viés is a phenomenon that occurs in aprendizado de máquina and inteligência artificial when algorithms are trained on datasets that do not accurately represent the entire population or context they are intended to model. This bias often arises when certain types of data are overrepresented in the training set, leading the model to perform better on that specific data while struggling with less-represented categories.
Por exemplo, se um reconhecimento facial system is trained predominantly on images of individuals from one demographic, it may not perform well for individuals from other demographics. This is because the algorithm has ‘seen’ more examples of the overrepresented group and thus learns to recognize their features more effectively. As a result, the model can exhibit skewed performance, which can have real-world implications, particularly in sensitive applications such as hiring, law enforcement, and healthcare.
O viés de exposição também pode se manifestar em sistemas de recomendação, where popular items gain even more visibility and are recommended more frequently, leading to a feedback loop that amplifies the visibility of already popular choices while obscuring more niche options.
To mitigate exposure bias, practitioners can take several approaches, such as ensuring diverse representation in training datasets, utilizing techniques to balance the data, and continuously monitoring desempenho do modelo across different groups. Evaluating the model on a wide array of data types can help identify and reduce potential biases, leading to more fair and accurate AI systems.