<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def load(cls, filepath):
 """ Loads a pickled version of the classifier saved in `filepath` """

        with open(filepath, "rb") as filehandler:
            classifier = pickle.load(filehandler)

        if not isinstance(classifier, Classifier):
            raise ValueError("Pickled object is not a Classifier")

        return classifier