def _cat(tensors: List[Tensor], dim: int = 0) -> Tensor:
    """
    Efficient version of torch.cat that avoids a copy if there is only a single element in a list
    """
    # TODO add back the assert
    # assert isinstance(tensors, (list, tuple))
    if len(tensors) == 1:
        return tensors[0]
    return torch.cat(tensors, dim)

    Efficient version of torch.cat that avoids a copy if there is only a single element in a list
    
intel_extension_for_pytorch/cpu/nn/_roi_align_helper.py