Example – identifying poisonous mushrooms with rule learners

Each year, many people fall ill and sometimes even die from ingesting poisonous wild mushrooms. Since many mushrooms are very similar to each other in appearance, occasionally even experienced mushroom gatherers are poisoned.

Unlike the identification of harmful plants such as a poison oak or poison ivy, there are no clear rules such as "leaves of three, let them be" to identify whether a wild mushroom is poisonous or edible. Complicating matters, many traditional rules, such as "poisonous mushrooms are brightly colored," provide dangerous or misleading information. If simple, clear, and consistent rules were available to identify poisonous mushrooms, they could save the lives of foragers. ...

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