def make_batch(tensor, batch_size):
    """
    Generate fake batch

    :param tensor: input tensor
    :type tensor: torch.Tensor
    :param batch_size: batch size
    :type batch_size: int
    :return: fake batch
    :rtype: torch.Tensor
    """
    assert len(tensor.shape) == 3, 'Assume 3D input tensor'
    return tensor.unsqueeze(0).repeat(batch_size, 1, 1, 1)