What is the point of partitioning your data? O To encourage overfitting, we make sure all partitions' data is used in our initial model To avoid overfitting, we make sure all partitions' data is used in our initial model O To encourage overfitting, we "keep back" a random portion of your data to check our predictions' effectiveness O To avoid overfitting, we "keep back" a random portion of your data to check our predictions' effectiveness