For each point we have the predicted class / regression value in column
response. If the learner predicts probabilities, a column ".prob.response" is
added that contains the probability of the predicted class

## Usage

`predict_grid(learners, task, grid_points, expand_range)`

## Arguments

- learners
list of trained learners, each learner belongs to one
resampling iteration

- task
the task all learners are trained on

- grid_points
(int): see sequenize

- expand_range
see sequenize