def __init__(self, hidden_size, layer_norm_eps):
        """dense + add is included in nn.MultiheadAttention.
        This class now only contains LayerNorm.
        """
        super().__init__()
        self.LayerNorm = nn.LayerNorm(hidden_size, eps=layer_norm_eps)
dense + add is included in nn.MultiheadAttention.
        This class now only contains LayerNorm.
        
examples/03_bert/modeling/bert.py