19th AIAI 2023, 14 - 17 June 2023, León, Spain

Active Learning Query Strategy Selection Using Dataset Meta-Features Extraction

Vangjel Kazllarof, Sotiris Kotsiantis


  In the age of information, data abundance has enabled scientists to create models that have great positive impact in our life and society. However, many times the rate of data production is much bigger than the rate of classifying them in the appropriate label due to complexity, personnel or cost of equipment for the labeling task. For this reason, Active Learning techniques have been developed with the Uncertainty Sampling being one of the most popular techniques for querying the unlabeled data. However, selecting the correct Query Strategy for ranking the uncertainty in order to create the best possible model is a time and cost consuming task and most of the times the Active Learning process needs to be repeated multiple times during training. In this work, we exploit the Meta-Features extracted by 123 datasets and select the winning Query Strategy among Least Confidence, Smallest Margin and Entropy for each dataset. In the sequence, we create a dataset with a subset of the extracted Meta-Features and the winning Query Strategy for each dataset and train it in order to create a Decision Tree that can be used in order to select the most suitable Query Strategy.  

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