[ez] Remove checks for torch version <= 2.8 (#33209)

Signed-off-by: angelayi <yiangela7@gmail.com>

vllm/_aiter_ops.py

@@ -8,7 +8,7 @@ from torch._ops import OpOverload
 
 import vllm.envs as envs
 from vllm.platforms import current_platform
-from vllm.utils.torch_utils import direct_register_custom_op, is_torch_equal_or_newer
+from vllm.utils.torch_utils import direct_register_custom_op
 from vllm.v1.attention.ops.rocm_aiter_mla_sparse import (
     rocm_aiter_sparse_attn_indexer,
     rocm_aiter_sparse_attn_indexer_fake,
@@ -1015,12 +1015,6 @@ class rocm_aiter_ops:
     def register_ops_once() -> None:
         global _OPS_REGISTERED
         if not _OPS_REGISTERED:
-            tags = (
-                tuple()
-                if is_torch_equal_or_newer("2.7.0")
-                else (torch.Tag.needs_fixed_stride_order,)
-            )
-
             # register all the custom ops here
             direct_register_custom_op(
                 op_name="rocm_aiter_asm_moe_tkw1",
@@ -1075,7 +1069,6 @@ class rocm_aiter_ops:
                 op_func=_rocm_aiter_mla_decode_fwd_impl,
                 mutates_args=["o"],
                 fake_impl=_rocm_aiter_mla_decode_fwd_fake,
-                tags=tags,
             )
 
             direct_register_custom_op(

vllm/compilation/backends.py

@@ -33,7 +33,6 @@ from vllm.logger import init_logger
 from vllm.logging_utils import lazy
 from vllm.platforms import current_platform
 from vllm.utils.import_utils import resolve_obj_by_qualname
-from vllm.utils.torch_utils import is_torch_equal_or_newer
 
 from .compiler_interface import (
     CompilerInterface,
@@ -94,10 +93,8 @@ def make_compiler(compilation_config: CompilationConfig) -> CompilerInterface:
     if compilation_config.backend == "inductor":
         # Use standalone compile only if requested, version is new enough,
         # and the symbol actually exists in this PyTorch build.
-        if (
-            envs.VLLM_USE_STANDALONE_COMPILE
-            and is_torch_equal_or_newer("2.8.0.dev")
-            and hasattr(torch._inductor, "standalone_compile")
+        if envs.VLLM_USE_STANDALONE_COMPILE and hasattr(
+            torch._inductor, "standalone_compile"
         ):
             logger.debug("Using InductorStandaloneAdaptor")
             return InductorStandaloneAdaptor(

vllm/compilation/compiler_interface.py

@@ -501,7 +501,6 @@ class InductorAdaptor(CompilerInterface):
             # get hit.
             # TODO(zou3519): we're going to replace this all with
             # standalone_compile sometime.
-            if is_torch_equal_or_newer("2.6"):
             stack.enter_context(
                 torch._inductor.config.patch(fx_graph_remote_cache=False)
             )

vllm/compilation/decorators.py

@@ -7,12 +7,11 @@ import inspect
 import os
 import sys
 from collections.abc import Callable, Generator
-from typing import TYPE_CHECKING, Any, Literal, TypeVar, overload
+from typing import TYPE_CHECKING, Any, TypeVar, overload
 from unittest.mock import patch
 
 import torch
 import torch.nn as nn
-from packaging import version
 from torch._dynamo.symbolic_convert import InliningInstructionTranslator
 
 import vllm.envs as envs
@@ -540,7 +539,6 @@ def _support_torch_compile(
             torch._dynamo.config.patch(**dynamo_config_patches),
             maybe_use_cudagraph_partition_wrapper(self.vllm_config),
             torch.fx.experimental._config.patch(**fx_config_patches),
-            _torch27_patch_tensor_subclasses(),
             torch._inductor.config.patch(**inductor_config_patches),
         ):
             use_aot_compile = envs.VLLM_USE_AOT_COMPILE
@@ -647,42 +645,3 @@ def maybe_use_cudagraph_partition_wrapper(
         and compilation_config.use_inductor_graph_partition
     ):
         torch._inductor.utils.set_customized_partition_wrappers(None)
-
-
-@contextlib.contextmanager
-def _torch27_patch_tensor_subclasses() -> Generator[None, None, None]:
-    """
-    Add support for using tensor subclasses (ie `BasevLLMParameter`, ect) when
-    using torch 2.7.0. This enables using weight_loader_v2 and the use of
-    `BasevLLMParameters` without having to replace them with regular tensors
-    before `torch.compile`-time.
-    """
-    from vllm.model_executor.parameter import (
-        BasevLLMParameter,
-        ModelWeightParameter,
-        RowvLLMParameter,
-        _ColumnvLLMParameter,
-    )
-
-    def return_false(*args: Any, **kwargs: Any) -> Literal[False]:
-        return False
-
-    if version.parse("2.7") <= version.parse(torch.__version__) < version.parse("2.8"):
-        yield
-        return
-
-    with (
-        torch._dynamo.config.patch(
-            "traceable_tensor_subclasses",
-            [
-                BasevLLMParameter,
-                ModelWeightParameter,
-                _ColumnvLLMParameter,
-                RowvLLMParameter,
-            ],
-        ),
-        patch(
-            "torch._dynamo.variables.torch.can_dispatch_torch_function", return_false
-        ),
-    ):
-        yield

vllm/compilation/inductor_pass.py

@@ -16,18 +16,10 @@ import torch
 from torch import fx
 from torch._subclasses.fake_tensor import FakeTensorMode, unset_fake_temporarily
 
-from vllm.utils.torch_utils import is_torch_equal_or_newer
-
 if TYPE_CHECKING:
     from vllm.config.utils import Range
 
-if is_torch_equal_or_newer("2.6"):
-    from torch._inductor.custom_graph_pass import CustomGraphPass
-else:
-    # CustomGraphPass is not present in 2.5 or lower, import our version
-    from .torch25_custom_graph_pass import (
-        Torch25CustomGraphPass as CustomGraphPass,
-    )
+from torch._inductor.custom_graph_pass import CustomGraphPass
 
 _pass_context = None
 P = ParamSpec("P")

vllm/config/compilation.py

@@ -777,7 +777,6 @@ class CompilationConfig:
         #    and it is not yet a priority. RFC here:
         #    https://github.com/vllm-project/vllm/issues/14703
 
-        if is_torch_equal_or_newer("2.6"):
         KEY = "enable_auto_functionalized_v2"
         if KEY not in self.inductor_compile_config:
             self.inductor_compile_config[KEY] = False

vllm/distributed/utils.py

@@ -31,7 +31,6 @@ import vllm.envs as envs
 from vllm.logger import init_logger
 from vllm.utils.network_utils import get_tcp_uri
 from vllm.utils.system_utils import suppress_stdout
-from vllm.utils.torch_utils import is_torch_equal_or_newer
 
 logger = init_logger(__name__)
 
@@ -429,20 +428,11 @@ def init_gloo_process_group(
     different torch versions.
     """
     with suppress_stdout():
-        if is_torch_equal_or_newer("2.6"):
         pg = ProcessGroup(
             prefix_store,
             group_rank,
             group_size,
         )
-        else:
-            options = ProcessGroup.Options(backend="gloo")
-            pg = ProcessGroup(
-                prefix_store,
-                group_rank,
-                group_size,
-                options,
-            )
         from torch.distributed.distributed_c10d import ProcessGroupGloo
 
         backend_class = ProcessGroupGloo(
@@ -450,8 +440,6 @@ def init_gloo_process_group(
         )
         backend_type = ProcessGroup.BackendType.GLOO
         device = torch.device("cpu")
-        if is_torch_equal_or_newer("2.6"):
-            # _set_default_backend is supported in torch >= 2.6
         pg._set_default_backend(backend_type)
         backend_class._set_sequence_number_for_group()
 
@@ -534,12 +522,5 @@ def stateless_destroy_torch_distributed_process_group(pg: ProcessGroup) -> None:
     Destroy ProcessGroup returned by
         stateless_init_torch_distributed_process_group().
     """
-    if is_torch_equal_or_newer("2.7"):
     pg.shutdown()
-    else:
-        # Lazy import for non-CUDA backends.
-        from torch.distributed.distributed_c10d import _shutdown_backend
-
-        _shutdown_backend(pg)
-
     _unregister_process_group(pg.group_name)

vllm/model_executor/layers/fused_moe/fused_moe.py

@@ -52,7 +52,7 @@ from vllm.model_executor.layers.quantization.utils.quant_utils import (
 )
 from vllm.platforms import current_platform
 from vllm.triton_utils import tl, triton
-from vllm.utils.torch_utils import direct_register_custom_op, is_torch_equal_or_newer
+from vllm.utils.torch_utils import direct_register_custom_op
 
 logger = init_logger(__name__)
 
@@ -1406,11 +1406,6 @@ direct_register_custom_op(
     op_func=inplace_fused_experts,
     mutates_args=["hidden_states"],
     fake_impl=inplace_fused_experts_fake,
-    tags=(
-        ()
-        if is_torch_equal_or_newer("2.7.0")
-        else (torch.Tag.needs_fixed_stride_order,)
-    ),
 )
 
 
@@ -1501,11 +1496,6 @@ direct_register_custom_op(
     op_name="outplace_fused_experts",
     op_func=outplace_fused_experts,
     fake_impl=outplace_fused_experts_fake,
-    tags=(
-        ()
-        if is_torch_equal_or_newer("2.7.0")
-        else (torch.Tag.needs_fixed_stride_order,)
-    ),
 )
 
 

vllm/model_executor/layers/quantization/mxfp4.py

@@ -56,7 +56,6 @@ from vllm.scalar_type import scalar_types
 from vllm.utils.flashinfer import has_flashinfer
 from vllm.utils.import_utils import has_triton_kernels
 from vllm.utils.math_utils import round_up
-from vllm.utils.torch_utils import is_torch_equal_or_newer
 
 logger = init_logger(__name__)
 
@@ -89,7 +88,6 @@ def get_mxfp4_backend_with_lora() -> Mxfp4Backend:
     # If FlashInfer is not available, try either Marlin or Triton
     triton_kernels_supported = (
         has_triton_kernels()
-        and is_torch_equal_or_newer("2.8.0")
         # NOTE: triton_kernels are only confirmed to work on SM90 and SM100
         # SM110 fails with this error: https://github.com/vllm-project/vllm/issues/29317
         # SM120 needs this fix: https://github.com/triton-lang/triton/pull/8498
@@ -151,7 +149,6 @@ def get_mxfp4_backend(with_lora_support: bool) -> Mxfp4Backend:
         # If FlashInfer is not available, try either Marlin or Triton
         triton_kernels_supported = (
             has_triton_kernels()
-            and is_torch_equal_or_newer("2.8.0")
             # NOTE: triton_kernels are only confirmed to work on SM90 and SM100
             # SM110 fails with this error: https://github.com/vllm-project/vllm/issues/29317
             # SM120 needs this fix: https://github.com/triton-lang/triton/pull/8498

vllm/model_executor/layers/quantization/torchao.py

@@ -108,20 +108,6 @@ class TorchAOConfig(QuantizationConfig):
         skip_modules: list[str] | None = None,
         is_checkpoint_torchao_serialized: bool = False,
     ) -> None:
-        """
-        # TorchAO quantization relies on tensor subclasses. In order,
-        # to enable proper caching this needs standalone compile
-        if is_torch_equal_or_newer("2.8.0.dev"):
-            os.environ["VLLM_TEST_STANDALONE_COMPILE"] = "1"
-            logger.info(
-                "Using TorchAO: Setting VLLM_TEST_STANDALONE_COMPILE=1")
-
-        # TODO: remove after the torch dependency is updated to 2.8
-        if is_torch_equal_or_newer(
-                "2.7.0") and not is_torch_equal_or_newer("2.8.0.dev"):
-            os.environ["VLLM_DISABLE_COMPILE_CACHE"] = "1"
-            logger.info("Using TorchAO: Setting VLLM_DISABLE_COMPILE_CACHE=1")
-        """
         super().__init__()
         self.torchao_config = torchao_config
         self.skip_modules = skip_modules or []

vllm/utils/torch_utils.py

@@ -709,9 +709,7 @@ def is_torch_equal(target: str) -> bool:
 
 # Supports xccl with PyTorch versions >= 2.8.0.dev for XPU platform
 def supports_xccl() -> bool:
-    return (
-        is_torch_equal_or_newer("2.8.0.dev") and torch.distributed.is_xccl_available()
-    )
+    return torch.distributed.is_xccl_available()
 
 
 # create a library to hold the custom op