[Tencent FIX BUILD FLOW] stabilize Hygon DCU wheel build and install flow

README.md

@@ -83,7 +83,7 @@ VLLM_USE_HYGON=1 python3 setup.py install （若调试，可使用 VLLM_USE_HYGO
 > 注意:
 > - 海光 DCU 环境必须设置 `VLLM_USE_HYGON=1`。
 > - 构建时会自动将海光定制包（如 `torch`、`triton`、`flash_attn`）改写为当前环境中的精确 `+das.*` 版本，避免 pip 在安装时替换为不兼容的 PyPI 版本。
-> - `hygon.txt` 只对高风险包做最小锁定：`numpy==1.26.4` 以及海光定制包，其余 Python 依赖保持正常解析。
+> - `hygon.txt` 只对高风险包做最小锁定：`numpy==1.26.4` 以及海光定制包的基础版本，其余 Python 依赖保持正常
 > - 海光路径会将 `fastapi[standard]`、`mistral_common[image]` 这类容易触发深度回溯的 extras 依赖替换为镜像中已验证的显式依赖版本。
 > - 可使用 `python tools/check_hygon_env.py` 在构建前和安装后校验关键包版本
 

requirements/hygon.text

@@ -3,8 +3,7 @@
 #
 # Keep the lock set minimal:
 # - pin numpy explicitly to avoid ABI-breaking upgrades
-# - keep Hygon custom packages on base versions here, then rewrite them
-#   to exact +das.* installed versions during bdist_wheel
+# - keep Hygon custom packages on base versions here
 -r common.txt
 
 # Pin numpy to 1.26.x: compatible with both custom torch ABI and

setup.py

@@ -1046,29 +1046,11 @@ def get_vllm_version() -> str:
 
     return version
 
-def _pin_hygon_local_versions(requirements: list[str]) -> list[str]:
-    """Pin packages with +das.* local versions to their exact installed
-    versions, and deduplicate requirements (later entries win)."""
-    import importlib.metadata
-
-    # First pass: pin +das versions
-    pinned = []
-    for req in requirements:
-        match = re.match(r'^([a-zA-Z0-9_-]+)\s*==', req)
-        if match:
-            pkg_name = match.group(1)
-            try:
-                installed_ver = importlib.metadata.version(pkg_name)
-                if "+das" in installed_ver:
-                    pinned.append(f"{pkg_name} == {installed_ver}")
-                    continue
-            except importlib.metadata.PackageNotFoundError:
-                pass
-        pinned.append(req)
-
+def _dedupe_requirements(requirements: list[str]) -> list[str]:
+    """Deduplicate requirements by package name, keeping later entries."""
     # Second pass: deduplicate by package name (later entries win)
     seen = {}
-    for req in pinned:
+    for req in requirements:
         match = re.match(r'^([a-zA-Z0-9_-]+)', req)
         if match:
             pkg_name = match.group(1).lower().replace("-", "_")
@@ -1195,7 +1177,7 @@ def get_requirements() -> list[str]:
             _validate_hygon_build_env()
             requirements = _read_requirements("hygon.txt")
             requirements = _rewrite_hygon_requirements(requirements)
-            requirements = _pin_hygon_local_versions(requirements)
+            requirements = _dedupe_requirements(requirements)
         else:
             requirements = _read_requirements("rocm.txt")
     elif _is_tpu():