Add Speculative Decoding Eagle3 topk > 1 (#5318)

Co-authored-by: Stefan He <hebiaobuaa@gmail.com>
Co-authored-by: Yubo Wang <yubowang2019@gmail.com>

test/srt/run_suite.py

@@ -29,7 +29,7 @@ suites = {
         TestFile("test_chunked_prefill.py", 336),
         TestFile("test_eagle_infer.py", 500),
         TestFile("test_ebnf_constrained.py"),
-        TestFile("test_fa3.py", 5),
+        TestFile("test_fa3.py", 200),
         TestFile("test_fp8_kernel.py", 8),
         TestFile("test_embedding_openai_server.py", 36),
         TestFile("test_hidden_states.py", 55),

test/srt/test_fa3.py

@@ -173,6 +173,60 @@ class TestFlashAttention3SpeculativeDecode(BaseFlashAttentionTest):
         self.assertGreater(avg_spec_accept_length, 1.5)
 
 
+class TestFlashAttention3SpeculativeDecodeTopk(BaseFlashAttentionTest):
+    """Test FlashAttention3 with speculative decode enabled, topk > 1"""
+
+    model = "meta-llama/Llama-3.1-8B-Instruct"
+
+    @classmethod
+    def get_server_args(cls):
+        args = super().get_server_args()
+        args.extend(
+            [
+                "--cuda-graph-max-bs",
+                "2",
+                "--speculative-algorithm",
+                "EAGLE3",
+                "--speculative-draft",
+                "jamesliu1/sglang-EAGLE3-Llama-3.1-Instruct-8B",
+                "--speculative-num-steps",
+                "5",
+                "--speculative-eagle-topk",
+                "4",
+                "--speculative-num-draft-tokens",
+                "8",
+                "--dtype",
+                "float16",
+            ]
+        )
+        return args
+
+    def test_gsm8k(self):
+        """
+        Override the test_gsm8k to further test for average speculative accept length.
+        """
+        requests.get(self.base_url + "/flush_cache")
+
+        args = SimpleNamespace(
+            num_shots=5,
+            data_path=DATA_PATH,
+            num_questions=200,
+            max_new_tokens=512,
+            parallel=128,
+            host="http://127.0.0.1",
+            port=int(self.base_url.split(":")[-1]),
+        )
+        metrics = run_eval_few_shot_gsm8k(args)
+        print(metrics)
+
+        self.assertGreater(metrics["accuracy"], 0.60)
+
+        server_info = requests.get(self.base_url + "/get_server_info")
+        avg_spec_accept_length = server_info.json()["avg_spec_accept_length"]
+        print(f"{avg_spec_accept_length=}")
+        self.assertGreater(avg_spec_accept_length, 1.8)
+
+
 class TestFlashAttention3MLASpeculativeDecode(BaseFlashAttentionTest):
     """Test FlashAttention3 with speculative decode enabled."""