[V0 Deprecation] Remove V0 Samplers test (#23862)

tests/samplers/test_seeded_generate.py

-# SPDX-License-Identifier: Apache-2.0
-# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
-"""Verify that seeded random sampling is deterministic.
-
-Run `pytest tests/samplers/test_seeded_generate.py`.
-"""
-import copy
-import random
-from itertools import combinations
-
-import pytest
-
-from vllm import SamplingParams
-from vllm.model_executor.utils import set_random_seed
-
-MODEL = "facebook/opt-125m"
-RANDOM_SEEDS = list(range(5))
-
-
-@pytest.fixture
-def vllm_model(vllm_runner, monkeypatch):
-    # This file relies on V0 internals.
-    monkeypatch.setenv("VLLM_USE_V1", "0")
-    with vllm_runner(MODEL, dtype="half") as vllm_model:
-        yield vllm_model
-
-
-@pytest.mark.parametrize("seed", RANDOM_SEEDS)
-def test_random_sample_with_seed(
-    vllm_model,
-    example_prompts,
-    seed: int,
-) -> None:
-    set_random_seed(seed)
-
-    sampling_params = SamplingParams(
-        # Parameters to ensure sufficient randomness
-        temperature=3.0,
-        top_p=min(random.random() + 0.3, 1),
-        top_k=random.randint(5, 20),
-        n=random.randint(1, 10),
-        presence_penalty=random.randint(0, 1),
-        max_tokens=8,
-        ignore_eos=True,
-    )
-
-    sampling_params_seed_1 = copy.deepcopy(sampling_params)
-    sampling_params_seed_1.seed = 100
-    sampling_params_seed_2 = copy.deepcopy(sampling_params)
-    sampling_params_seed_2.seed = 200
-
-    llm = vllm_model.llm
-
-    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, 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]
-
-        # verify generations within the same parallel sampling group differ
-        for output in outputs:
-            for sub_output_a, sub_output_b in combinations(output, 2):
-                assert sub_output_a != sub_output_b