src/transformers/models/qdqbert/modeling_qdqbert.py/QDQBertEncoder/__init__
class QDQBertEncoder:    def __init__(self, config):
        super().__init__()
        self.config = config
        self.layer = nn.ModuleList([QDQBertLayer(config) for _ in range(config.num_hidden_layers)])
        self.gradient_checkpointing = False