# Machine Learning Extractor Trainer

> The Machine Learning Extractor Trainer collects the human feedback for you, in a directory of your choice. Once you collect data and you want to retrain an ML Model, you can just zip the content of the directory and upload it in Document Manager for curation.

The Machine Learning Extractor Trainer collects the human feedback for you, in a directory of your choice. Once you collect data and you want to retrain an ML Model, you can just zip the content of the directory and upload it in Document Manager for curation.

## Learn More

To learn more about **Machine Learning Extractor Trainer**, please visit this [page](https://docs.uipath.com/document-understanding/automation-cloud/latest/classic-user-guide/machine-learning-extractor-trainer#machine-learning-extractor-trainer).

To learn how to use the **Machine Learning Extractor Trainer** activity to retrain ML Models with data from **Validation Station**, please check the [The Auto-retraining Loop (Preview)](https://docs.uipath.com/document-understanding/automation-cloud/latest/classic-user-guide/ml-packages-auto-retraining-loop#the-auto-fine-tuning-loop-(public-preview)).