def forward(
            self,
            x: torch.Tensor,
            n_q: typing.Optional[int] = None,
            layers: typing.Optional[list] = None,
    ) -> QuantizedResult:
        """Residual vector quantization on the given input tensor.
        Args:
            x (torch.Tensor): Input tensor.
            n_q (int): Number of quantizer used to quantize. Default: All quantizers.
            layers (list): Layer that need to return quantized. Defalt: None.
        Returns:
            QuantizedResult:
                The quantized (or approximately quantized) representation with
                the associated numbert quantizers and layer quantized required to return.
        """
        n_q = n_q if n_q else self.n_q
        if layers and max(layers) >= n_q:
            raise ValueError(
                f"Last layer index in layers: A {max(layers)}. Number of quantizers in RVQ: B {self.n_q}. A must less than B."
            )
        quantized, codes, commit_loss, quantized_list = self.vq(
            x, n_q=n_q, layers=layers
        )
        return quantized, codes, torch.mean(commit_loss), quantized_list
Residual vector quantization on the given input tensor.
        Args:
            x (torch.Tensor): Input tensor.
            n_q (int): Number of quantizer used to quantize. Default: All quantizers.
            layers (list): Layer that need to return quantized. Defalt: None.
        Returns:
            QuantizedResult:
                The quantized (or approximately quantized) representation with
                the associated numbert quantizers and layer quantized required to return.
        
parrots/synthesizer_utils.py