drop ascend scheduler (#4498)

Ascend scheduler was added for non chunk prefill case before, since that
the npu ops didn't work well with chunked prefill.

Now the ops with chunked prefill work better, it's time to remove the
ascend scheduler to use vLLM default scheduler.

- vLLM version: v0.11.2

---------

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

tests/ut/core/test_schedule_config.py

@@ -1,134 +0,0 @@
-#
-# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from vllm.config import SchedulerConfig
-
-from tests.ut.base import TestBase
-from vllm_ascend.core.schedule_config import AscendSchedulerConfig
-
-
-class TestAscendSchedulerConfig(TestBase):
-
-    def setUp(self):
-        self.basic_scheduler_config = SchedulerConfig(
-            max_num_batched_tokens=8192,
-            max_model_len=8192,
-            is_multimodal_model=False,
-            send_delta_data=False,
-        )
-
-    def test_initialize_from_config_with_default(self):
-        # No additional config given, check the default value here.
-        ascend_config = AscendSchedulerConfig.initialize_from_config(
-            self.basic_scheduler_config, {})
-        self.assertEqual(ascend_config.enable_chunked_prefill, False)
-        self.assertEqual(ascend_config.policy, "fcfs")
-        self.assertEqual(ascend_config.scheduler_cls,
-                         "vllm_ascend.core.scheduler.AscendScheduler")
-        self.assertEqual(ascend_config.max_num_encoder_input_tokens, 8192)
-        self.assertEqual(ascend_config.encoder_cache_size, 8192)
-
-    def test_initialize_from_config_with_override(self):
-        # test override
-        ascend_config = AscendSchedulerConfig.initialize_from_config(
-            self.basic_scheduler_config,
-            AscendSchedulerConfig(
-                enable_chunked_prefill=False,
-                policy="fcfs",
-                scheduler_cls="vllm_ascend.core.scheduler.AscendScheduler",
-                max_num_batched_tokens=8192,
-                max_model_len=2048,
-                max_long_partial_prefills=1,
-                long_prefill_token_threshold=512,
-            ),
-        )
-        self.assertEqual(ascend_config.enable_chunked_prefill, False)
-        self.assertEqual(ascend_config.policy, "fcfs")
-        self.assertEqual(ascend_config.scheduler_cls,
-                         "vllm_ascend.core.scheduler.AscendScheduler")
-        self.assertEqual(ascend_config.max_num_batched_tokens, 8192)
-        self.assertEqual(ascend_config.encoder_cache_size, 8192)
-        self.assertEqual(ascend_config.max_long_partial_prefills, 1)
-        self.assertEqual(ascend_config.long_prefill_token_threshold, 512)
-
-    def test_not_implemented_policy(self):
-        with self.assertRaises(NotImplementedError) as context:
-            AscendSchedulerConfig.initialize_from_config(
-                self.basic_scheduler_config,
-                AscendSchedulerConfig(
-                    policy="custom_policy",
-                    max_num_batched_tokens=8192,
-                    max_model_len=2048,
-                ),
-            )
-        self.assertIn(
-            "currently AscendScheduler only supports fcfs policy",
-            str(context.exception),
-        )
-
-    def test_no_override(self):
-        ascend_config = AscendSchedulerConfig.initialize_from_config(
-            self.basic_scheduler_config, {})
-        self.assertEqual(ascend_config.max_num_encoder_input_tokens, 8192)
-        self.assertEqual(ascend_config.encoder_cache_size, 8192)
-
-    def test_valid_config_with_multimodal(self):
-        config = AscendSchedulerConfig.initialize_from_config(
-            SchedulerConfig(is_multimodal_model=True,
-                            max_num_batched_tokens=8192), {})
-        self.assertTrue(config.is_multimodal_model)
-
-    def test_valid_config_with_chunked_prefill(self):
-        ascend_config = AscendSchedulerConfig.initialize_from_config(
-            self.basic_scheduler_config,
-            AscendSchedulerConfig(
-                enable_chunked_prefill=True,
-                max_num_batched_tokens=8192,
-                max_model_len=8192,
-            ),
-        )
-        self.assertEqual(ascend_config.max_num_batched_tokens, 8192)
-        self.assertEqual(ascend_config.max_model_len, 8192)
-        self.assertTrue(ascend_config.enable_chunked_prefill)
-
-    def test_invalid_config_without_chunked_prefill(self):
-        with self.assertRaises(ValueError) as context:
-            AscendSchedulerConfig.initialize_from_config(
-                self.basic_scheduler_config,
-                AscendSchedulerConfig(
-                    enable_chunked_prefill=False,
-                    max_num_batched_tokens=2048,
-                    max_model_len=8192,
-                ),
-            )
-        self.assertIn(
-            "Ascend scheduler is enabled without chunked prefill feature",
-            str(context.exception),
-        )
-        self.assertIn("max_num_batched_tokens (2048)", str(context.exception))
-        self.assertIn("max_model_len (8192)", str(context.exception))
-
-    def test_initialize_from_config_with_pd_transfer(self):
-        ascend_config = AscendSchedulerConfig.initialize_from_config(
-            self.basic_scheduler_config,
-            AscendSchedulerConfig(
-                enable_pd_transfer=True,
-                decode_max_num_seqs=48,
-                max_num_batched_tokens=8192,
-                max_model_len=4096,
-            ),
-        )
-        self.assertEqual(ascend_config.enable_pd_transfer, True)
-        self.assertEqual(ascend_config.decode_max_num_seqs, 48)