def init_adapter_layers(self):
        """
        (Re-)initialize attention adapter layers and lm head for adapter-only fine-tuning
        """
        # init attention adapters
        for module in self.modules():
            if isinstance(module, Wav2Vec2AttnAdapterLayer):
                self._init_weights(module)

        # init lm head
        if isinstance(self, Wav2Vec2ForCTC):
            self._init_weights(self.lm_head)

        (Re-)initialize attention adapter layers and lm head for adapter-only fine-tuning
        
dpkd/transformers/src/transformers/models/wav2vec2/modeling_wav2vec2.py