feat(CRITICAL): 从 GitHub 扫描搬运 ixformer SDK + xllm 完整 GDN/MoE 代码

来源:
  1. Chranos/ixformer (GitHub) → ixformer_sdk/ (230 files, 70K lines)
     - inference/functions/vllm.py: vllm_moe_topk_softmax 完整实现 (2033 lines)
     - inference/functions/moe.py: MoE ops 完整实现 (1380 lines)
     - contrib/vllm_flash_attn/: FA2 Python 接口 (1018 lines)
     - contrib/tgi/fused_moe.py: TGI fused MoE (429 lines)
     - csrc/include/ixformer/: C++ kernel headers + cmake

  2. Deep-Spark/xllm (GitHub) → upstream_ref/xllm_latest/ (+15 files)
     - npu_torch/qwen3_5_decoder_layer_impl.cpp/.h
     - npu_torch/qwen3_5_gated_delta_net.cpp/.h
     - npu_torch/qwen3_next_*.cpp/.h (6 files)
     - npu_torch/attention.cpp/.h + fused_moe.cpp/.h + CMakeLists.txt
     - models/llm/qwen3_5.h + qwen3_5_mtp.h + qwen3_next.h
     - models/vlm/qwen3_5.h

调用链完整性:
  ixformer_sdk/inference/functions/vllm.py
    → ops.infer.moe_topk_softmax() (C++ 层)
    → 这就是 base 镜像 libixformer.so 里的实现

  upstream_ref/xllm_latest/core/layers/ilu/fused_moe.cpp
    → ixformer::infer::topk_softmax() (直接 C++ 调用)
    → ixformer::infer::group_gemm() → 完整 7-step MoE pipeline

ixformer_sdk/utils/benchmark/timer.py

@@ -0,0 +1,130 @@
+import time
+from collections import OrderedDict
+from typing import Callable
+
+from tabulate import tabulate
+from tqdm import tqdm
+import torch
+
+
+class BenchmarkTimer:
+    def __init__(self):
+        self.reset()
+
+    def reset(self):
+        self.start_time = None
+        self.end_time = None
+        self.running_times = []
+
+    def __enter__(self):
+        self.start_time = time.perf_counter()
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.end_time = time.perf_counter()
+        self.running_times.append(self.end_time - self.start_time)
+
+
+class Benchmark:
+    def __init__(
+        self,
+        warmup: int = None,
+        number: int = 100,
+        timer=None,
+        description: str = None,
+        show_progress: bool = False,
+        fn_desc_key: str = "fn_desc",
+        sync: bool = True,
+    ):
+        if warmup is None:
+            warmup = int(number // 100) + 10
+        self.warmup = warmup
+        self.number = number
+        self.description = description
+        self.show_progress = show_progress
+        self.fn_desc_key = fn_desc_key
+        self.sync = sync
+
+        if timer is None:
+            timer = BenchmarkTimer()
+        self.timer = timer
+
+        self.reset()
+
+    def reset(self):
+        self.results = OrderedDict()
+        self._run_index = 0
+        self._fn_name = None
+
+    def run(self, fn, *args, **kwargs):
+        self._run_index += 1
+
+        if self.fn_desc_key in kwargs:
+            self.set_fn_name(kwargs[self.fn_desc_key])
+            kwargs.pop(self.fn_desc_key)
+        key = self._get_fn_key(fn)
+
+        # warmup
+        self._run_fn(False, fn, *args, **kwargs)
+
+        # get running times
+        results = self._run_fn(True, fn, *args, **kwargs)
+        self.results[key] = results
+
+        return results
+
+    def set_fn_name(self, name):
+        self._fn_name = name
+
+    def _run_fn(self, benchmark: bool, fn: Callable, *args, **kwargs):
+        self.timer.reset()
+        n = self.number if benchmark else self.warmup
+        if self.show_progress and benchmark:
+            progress = tqdm(range(n), desc=self._get_fn_key(fn))
+        else:
+            progress = range(n)
+
+        torch.cuda.synchronize()
+
+        for _ in progress:
+            with self.timer:
+                fn(*args, **kwargs)
+
+                if self.sync:
+                    torch.cuda.synchronize()
+
+        return self.timer.running_times
+
+    def _get_fn_key(self, fn: Callable):
+        if self._fn_name is not None:
+            return self._fn_name
+
+        if hasattr(fn, "__name__"):
+            fn_name = fn.__name__
+        else:
+            fn_name = str(fn)
+
+        return f"{fn_name}_{self._run_index}"
+
+    def render(self) -> str:
+        head = [""] + list(self.results.keys())
+        total = ["Total (s)"] + [sum(times) for times in self.results.values()]
+        mean = ["Mean  (s)"] + [_t / self.number for _t in total[1:]]
+        min_ = ["Min   (s)"] + [min(times) for times in self.results.values()]
+        max_ = ["Max   (s)"] + [max(times) for times in self.results.values()]
+        count = ["Count"] + [len(list(times)) for times in self.results.values()]
+
+        return tabulate(
+            headers=head,
+            tabular_data=[total, mean, min_, max_, count],
+            numalign="right",
+        )
+
+    def print_caption(self):
+        if self.description is not None:
+            caption = "\n" + "=" * 60 + "\n"
+            caption += f"= {self.description}" + "\n"
+            caption += "=" * 60 + "\n"
+            print(caption)
+
+    def print(self):
+        print(self.render())