What is the purpose of the FunctionTransformer class in scikit-learn?

Question

Data Science with Python — Hard

What is the purpose of the FunctionTransformer class in scikit-learn?

Accepted Answer

The FunctionTransformer class in scikit-learn is used to wrap an arbitrary Python function as a transformer that can be used in a Pipeline with fit() and transform() methods. This allows custom functions to be seamlessly integrated into the scikit-learn workflow.