Encodes a ``label``.

        Args:
            label (object): Label to encode.

        Returns:
            torch.Tensor: Encoding of the label.

def encode(self, label):
        """ Encodes a ``label``.

        Args:
            label (object): Label to encode.

        Returns:
            torch.Tensor: Encoding of the label.
        """
        label = super().encode(label)

        return torch.tensor(self.stoi.get(label, self.unknown_index))