add qwen3

2026-02-04 17:22:39 +08:00
parent d1c0f68ab4
commit 8511fe8530
1932 changed files with 300426 additions and 0 deletions
--- a/vllm-v0.6.2/vllm/model_executor/layers/quantization/kv_cache.py
+++ b/vllm-v0.6.2/vllm/model_executor/layers/quantization/kv_cache.py
@@ -0,0 +1,76 @@
+import torch
+
+from vllm.model_executor.layers.quantization.base_config import (
+    QuantizationConfig, QuantizeMethodBase)
+from vllm.utils import print_warning_once
+
+
+class BaseKVCacheMethod(QuantizeMethodBase):
+    """
+    Quant method that adds `_k_scale` and `_v_scale` attributes to the
+    Attention layer to support loading those scaling factors from checkpoints. 
+    The k/v_scale will be used to:
+        - quantize k/v_cache entries before saving them to the cache
+        - dequantize k/v_cache entries before fetching them from the cache
+
+    :param quant_config: the appropriate QuantizationConfig 
+    """
+
+    def __init__(self, quant_config: QuantizationConfig):
+        self.quant_config = quant_config
+
+    def create_weights(self, layer: torch.nn.Module):
+        """
+        Create "weight" (aka k_scale and v_scale) for an attention layer.
+        """
+        # Initialize the KV cache scales to -1.0, which is an invalid value.
+        # If the k/v_scale appears in the checkpoint, it will be
+        # overwritten when loading weights.
+        layer.k_scale = torch.nn.Parameter(torch.tensor(-1.0),
+                                           requires_grad=False)
+        layer.v_scale = torch.nn.Parameter(torch.tensor(-1.0),
+                                           requires_grad=False)
+
+    def apply(self, layer: torch.nn.Module) -> torch.Tensor:
+        raise RuntimeError(
+            f"{self.__class__.__name__}.apply should not be called.")
+
+    def process_weights_after_loading(self, layer: torch.nn.Module) -> None:
+        # If the kv-cache dtype is auto, we enforce the k/v_scale to be 1.0
+        # regardless whether the kv-scale is available in the checkpoint.
+        if layer.kv_cache_dtype != "auto":
+            if layer.k_scale > 0.0 and layer.v_scale > 0.0:
+                # We prefer to use separate k_scale and v_scale if present
+                k_scale = layer.k_scale.to("cpu").tolist()
+                v_scale = layer.v_scale.to("cpu").tolist()
+            elif layer.k_scale < 0.0 and layer.v_scale < 0.0:
+                # If no scales were loaded (both scales are invalid negative
+                # values), use the default value of 1.0
+                k_scale = 1.0
+                v_scale = 1.0
+            else:
+                # If we find a single kv_scale in the checkpoint, we remap
+                # kv_scale to k_scale during weight loading, and duplicate
+                # k_scale to v_scale here
+                assert layer.k_scale > 0.0
+                scale_to_duplicate = max(layer.k_scale, layer.v_scale)
+                k_scale = scale_to_duplicate.to("cpu").tolist()
+                v_scale = scale_to_duplicate.to("cpu").tolist()
+
+            if not isinstance(k_scale, float) or not isinstance(
+                    v_scale, float):
+                raise ValueError("Only support per-tensor scaling factor "
+                                 "for fp8 KV cache")
+
+            # These are used in the final Attention.forward()
+            layer._k_scale = k_scale
+            layer._v_scale = v_scale
+            if (layer._k_scale == 1.0 and layer._v_scale == 1.0
+                    and "e5m2" not in layer.kv_cache_dtype):
+                print_warning_once(
+                    "Using KV cache scaling factor 1.0 for fp8_e4m3. This "
+                    "may cause accuracy issues. Please make sure k/v_scale "
+                    "scaling factors are available in the fp8 checkpoint.")
+
+        del layer.k_scale
+        del layer.v_scale