Difference between fit, transform and fit_transform

When to use fit, transform and fit_transform ?

fit() is used to "train model" - it means to calculate parameters for transformation.

Only after training model you can transform() data.

If you want then you can do both things in one step using fit_transform()

So all depends on you if you need fit() + other calculations + transform() or at once fit_transform()


Stackoverflow: what is the difference between ‘transform’ and ‘fit_transform’ in sklearn

Data Science: What’s the difference between fit and fit_transform in scikit-learn models?

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