Which of the following function provides unsupervised prediction ?

The correct answer is D. None of the mentioned.

cl_forecast, cl_nowcast, and cl_precast are all supervised prediction functions. They require a training dataset with labeled data to learn the relationship between the input features and the output labels. Once trained, they can be used to predict the output labels for new data.

Unsupervised prediction is a type of machine learning that does not require labeled data. Instead, it uses unlabeled data to find patterns and relationships in the data. This type of prediction is often used for exploratory data analysis or to identify outliers.

Some examples of unsupervised prediction algorithms include k-means clustering, hierarchical clustering, and principal component analysis.