def get_weights_row()

in server/text_generation_server/layers/gptq/__init__.py [0:0]

• 86 lines of code
• 22 McCabe index (conditional complexity)

    def get_weights_row(self, weights: Weights, prefix: str):
        self._get_gptq_params(weights)

        use_exllama = True
        desc_act = self.desc_act
        if self.bits != 4:
            use_exllama = False

        if self.desc_act:
            log_once(logger.warning, "Disabling exllama because desc_act=True")
            use_exllama = False

        if self.is_layer_skipped_quantization(prefix, self.modules_to_not_convert):
            return DefaultWeightsLoader.get_weights_row(weights, prefix)
        try:
            qweight = weights.get_sharded(f"{prefix}.qweight", dim=0)
        except RuntimeError:
            raise RuntimeError(
                "Cannot load `gptq` weight, make sure the model is already quantized, or quantize it with `text-generation-server quantize ORIGINAL_MODEL_ID NEW_MODEL_ID`"
            )

        if self.quantize == "gptq" and self.quant_method == "gptq":
            g_idx = weights.get_sharded(f"{prefix}.g_idx", dim=0)
        else:
            g_idx = None

        if weights.process_group.size() > 1:
            if g_idx is not None:
                if (
                    not torch.equal(
                        # Remove g_idx[0] to adapt the check with TP>1.
                        (g_idx - g_idx[0]).cpu(),
                        torch.tensor(
                            [i // self.groupsize for i in range(g_idx.shape[0])],
                            dtype=torch.int32,
                        ),
                    )
                    and not (g_idx == 0).all()
                ):
                    # Exllama implementation does not support row tensor parallelism with act-order, as
                    # it would require to reorder input activations that are split unto several GPUs
                    use_exllama = False
                    desc_act = True

        from text_generation_server.layers.gptq import (
            CAN_EXLLAMA,
            HAS_EXLLAMA,
            GPTQWeight,
        )

        if use_exllama:
            if not HAS_EXLLAMA:
                if CAN_EXLLAMA:
                    log_once(
                        logger.warning,
                        "Exllama GPTQ cuda kernels (which are faster) could have been used, but are not currently installed, try using BUILD_EXTENSIONS=True",
                    )
                use_exllama = False
            else:
                log_once(logger.info, f"Using exllama kernels v{HAS_EXLLAMA}")

        if not desc_act and self.groupsize != -1:
            qzeros = weights.get_sharded(f"{prefix}.qzeros", dim=0)
            scales = weights.get_sharded(f"{prefix}.scales", dim=0)
            if g_idx is not None:
                # qzeros, scales sharded, and g_idx must be adjusted accordingly
                g_idx = g_idx - g_idx[0]
        else:
            qzeros = weights.get_tensor(f"{prefix}.qzeros")
            scales = weights.get_tensor(f"{prefix}.scales")

        if self.quantize == "gptq" and self.quant_method == "awq":
            log_once(
                logger.info, "Converting AWQ model to Exllama/GPTQ packing format."
            )
            from text_generation_server.layers.awq.conversion_utils import (
                fast_awq_to_gptq,
            )

            qweight, qzeros = fast_awq_to_gptq(qweight, qzeros)
            if use_exllama:
                g_idx = None
            else:
                g_idx = (
                    torch.arange(
                        qweight.shape[0] * (32 // self.bits),
                        device=qweight.device,
                    )
                    // self.groupsize
                ).to(dtype=torch.int32)

        return GPTQWeight(
            qweight=qweight,
            qzeros=qzeros,
            scales=scales,
            g_idx=g_idx,
            bits=self.bits,
            groupsize=self.groupsize,
            use_awq_kernel=self.quantize == "awq",
            use_exllama=use_exllama,
        )