src/transformers/models/ibert/modeling_ibert.py/IBertAttention/__init__
class IBertAttention:    def __init__(self, config):
        super().__init__()
        self.quant_mode = config.quant_mode
        self.self = IBertSelfAttention(config)
        self.output = IBertSelfOutput(config)
        self.pruned_heads = set()