src/transformers/models/imagegpt/modeling_imagegpt.py/ImageGPTLayerNorm/__init__
class ImageGPTLayerNorm:    def __init__(self, hidden_size: Tuple[int], eps: float = 1e-5):
        super().__init__()
        self.eps = eps
        self.weight = nn.Parameter(torch.Tensor(hidden_size))