Error in Confusion Matrix: The Data Contain Levels Not Found in the Data

Resolving the "Task 1 Failed" Error in Gradient Boosting with Caret Package in R.

Boosting Efficiency: Implementing Parallel Processing in Caret Models for Faster Machine Learning Workflows

Understanding Indexing in caretEnsemble CV Length Incorrectly: How to Correctly Use indexOut for Consistent Sample Sizes