RMSE for Explicit Data

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The documentation homepage says, "LightFM is a Python implementation of a number of popular recommendation algorithms for both implicit and explicit feedback."

But if it can work with explicit feedback, why no RMSE or MAE metrics are provided in model evaluation(https://making.lyst.com/lightfm/docs/lightfm.evaluation.html)? Only ranking metrics are provided. Does this mean actually LightFM only can work with implicit data?