    def decode(self):
        """
        Returns the encoded full weight matrix. Must be called after
        the encode function.
        """

        # fully connected case
        if "k_h" not in self.__dict__:
            return (
                self.centroids[self.assignments]
                .reshape(-1, self.out_features, self.block_size)
                .permute(1, 0, 2)
                .flatten(1, 2)
            )

        # convolutional case
        else:
            return (
                self.centroids[self.assignments]
                .reshape(-1, self.out_channels, self.block_size)
                .permute(1, 0, 2)
                .reshape(self.out_channels, self.in_channels, self.k_h, self.k_w)
            )
Returns the encoded full weight matrix. Must be called after
the encode function.
fairseq/modules/quantization/pq/pq.py