src/transformers/models/audio_spectrogram_transformer/modeling_audio_spectrogram_transformer.py/ASTEncoder/__init__
class ASTEncoder:    def __init__(self, config: ASTConfig) -> None:
        super().__init__()
        self.config = config
        self.layer = nn.ModuleList([ASTLayer(config) for _ in range(config.num_hidden_layers)])
        self.gradient_checkpointing = False