In machine learning and data mining, a quantifier is a model trained using supervised learning to estimate the distribution of classes in a given dataset.

• Classification
• Data analysis and visualization
• Predictive modeling
• Unsupervised learning

For instance, a quantifier could be trained on a dataset of images labeled with their corresponding classes (e.g., cats, dogs, cars). The quantifier would then provide an estimate of the overall class distribution in the dataset, such as the percentage of images that are cats or dogs.

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