Classification algorithms to mine data stream have been extensively studied in recent years.
However, a lot of these algorithms are designed for supervised learning which requires
labeled instances. Nevertheless, the labeling of the data is costly and time-consuming.
Because of this, alternative learning paradigms have been proposed to reduce the cost of the
labeling process without significant loss of model performance. Active learning is one of these
paradigms, whose main objective is to build classification models that request the lowest
possible number of labeled examples achieving adequate levels of accuracy. Therefore, this
work presents the FASE-AL algorithm which induces classification models with non-labeled
instances using Active Learning. FASE-AL is based on the algorithm Fast Adaptive Stacking
of Ensembles (FASE). FASE is an ensemble algorithm that detects and adapts the model when
the input data stream has concept drift. FASE-AL was compared with four different strategies
of active learning found in the literature. Real and synthetic databases were used in the
experiments. The algorithm achieves promising results in terms of the percentage of correctly
classified instances.