Adding samples as File generator resources

Updating version to 3.0.1

Adding new argument to local model predict that shows next split field

Improving error message and typo

Adding doc for new arguments in local ensembles predict method and tests

Adding REST API calls for samples

Adding the distribution units to the predictions of local models

Adding distribution units and add_median in local model predict

Adding the median as new prediction type in models

Fixing bug: centroids failed for clusters with summary fields