src/transformers/models/hubert/modeling_hubert.py/HubertForCTC/freeze_feature_extractor
class HubertForCTC:    def freeze_feature_extractor(self):
        """
        Calling this function will disable the gradient computation for the feature extractor so that its parameter
        will not be updated during training.
        """
        self.hubert.feature_extractor._freeze_parameters()