Change seeded generate test to use mixed batch

tests/samplers/test_seeded_generate.py

@@ -12,7 +12,7 @@
 from vllm import SamplingParams
 
 MODEL = "facebook/opt-125m"
-RANDOM_SEEDS = list(range(3))
+RANDOM_SEEDS = list(range(5))
 
 
 @pytest.fixture
@@ -37,7 +37,7 @@ def test_random_sample_with_seed(
         top_k=random.randint(5, 20),
         n=random.randint(1, 10),
         presence_penalty=random.randint(0, 1),
-        max_tokens=4,
+        max_tokens=8,
         ignore_eos=True,
     )
 
@@ -46,23 +46,37 @@ def test_random_sample_with_seed(
     sampling_params_seed_2 = copy.deepcopy(sampling_params)
     sampling_params_seed_2.seed = 200
 
-    vllm_outputs_no_seed_1 = vllm_model.generate(example_prompts,
-                                                 sampling_params)
-    vllm_outputs_seed_1_1 = vllm_model.generate(example_prompts,
-                                                sampling_params_seed_1)
-    vllm_outputs_seed_2_1 = vllm_model.generate(example_prompts,
-                                                sampling_params_seed_2)
-    vllm_outputs_no_seed_2 = vllm_model.generate(example_prompts,
-                                                 sampling_params)
-    vllm_outputs_seed_1_2 = vllm_model.generate(example_prompts,
-                                                sampling_params_seed_1)
-    vllm_outputs_seed_2_2 = vllm_model.generate(example_prompts,
-                                                sampling_params_seed_2)
-
-    for output_a, output_b in combinations(
-        (vllm_outputs_no_seed_1, vllm_outputs_no_seed_2, vllm_outputs_seed_1_1,
-         vllm_outputs_seed_2_1), 2):
-        assert output_a != output_b
-
-    assert vllm_outputs_seed_1_1 == vllm_outputs_seed_1_2
-    assert vllm_outputs_seed_2_1 == vllm_outputs_seed_2_2
+    llm = vllm_model.model
+
+    for prompt in example_prompts:
+        for params in (
+                sampling_params,
+                sampling_params_seed_1,
+                sampling_params_seed_2,
+                sampling_params,
+                sampling_params_seed_1,
+                sampling_params_seed_2,
+        ):
+            llm._add_request(
+                prompt=prompt,
+                prompt_token_ids=None,
+                sampling_params=params,
+            )
+
+    results = llm._run_engine(use_tqdm=False)
+    all_outputs = [[out.token_ids for out in output.outputs]
+                   for output in results]
+
+    for i in range(0, len(example_prompts), 6):
+        outputs = all_outputs[i:i + 6]
+
+        # verify all non-seeded requests differ
+        for output_a, output_b in combinations(
+            (outputs[0], outputs[1], outputs[2], outputs[3]),
+                2,
+        ):
+            assert output_a != output_b
+
+        # verify requests with the same seed match
+        assert outputs[1] == outputs[4]
+        assert outputs[2] == outputs[5]