content: from __future__ import annotations
  
  import collections.abc
  import logging
  import platform
  import warnings
  from enum import Enum
  from typing import Any, Callable, List, Optional, Sequence, Set, Union
  
  import torch
  from torch_tensorrt._enums import dtype
  from torch_tensorrt._features import ENABLED_FEATURES, needs_cross_compile
  from torch_tensorrt._Input import Input
  from torch_tensorrt.dynamo import _defaults
  from torch_tensorrt.dynamo.runtime._CudaGraphsTorchTensorRTModule import (
      CudaGraphsTorchTensorRTModule,
  )
  from typing_extensions import TypeGuard
  
  if ENABLED_FEATURES.fx_frontend:
      import torch.fx
      from torch_tensorrt.fx import InputTensorSpec
      from torch_tensorrt.fx.lower import compile as fx_compile
      from torch_tensorrt.fx.utils import LowerPrecision
  
      InputType = Union[Input, torch.Tensor, InputTensorSpec]
  else:
      InputType = Union[Input, torch.Tensor]
  
  if ENABLED_FEATURES.torchscript_frontend:
      import torch_tensorrt.ts
      from torch_tensorrt.ts._compiler import compile as torchscript_compile
      from torch_tensorrt.ts._compiler import (
          convert_method_to_trt_engine as ts_convert_method_to_trt_engine,
      )
  
  if ENABLED_FEATURES.dynamo_frontend:
      from torch.export import ExportedProgram
      from torch_tensorrt.dynamo._compiler import compile as dynamo_compile
      from torch_tensorrt.dynamo._compiler import (
          convert_exported_program_to_serialized_trt_engine as dynamo_convert_exported_program_to_serialized_trt_engine,
      )
      from torch_tensorrt.dynamo._compiler import (
          cross_compile_for_windows as dynamo_cross_compile_for_windows,
      )
      from torch_tensorrt.dynamo._compiler import (
          load_cross_compiled_exported_program as dynamo_load_cross_compiled_exported_program,
      )
      from torch_tensorrt.dynamo._compiler import (
          save_cross_compiled_exported_program as dynamo_save_cross_compiled_exported_program,
      )
      from torch_tensorrt.dynamo._tracer import trace as dynamo_trace
  
  logger = logging.getLogger(__name__)
  
  __all__ = [
      "compile",
      "cross_compile_for_windows",
      "load_cross_compiled_exported_program",
      "convert_method_to_trt_engine",
      "save",
      "load",
  ]
  
  
  def _non_fx_input_interface(
      inputs: Sequence[Input | torch.Tensor],
  ) -> TypeGuard[List[Input | torch.Tensor]]:
      return all(isinstance(i, (torch.Tensor, Input)) for i in inputs)
  
  
  class _IRType(Enum):
      """Enum to determine the type of IR selected for model compilation"""
  
      ts = 0
      fx = 1
      dynamo = 2
      torch_compile = 3
      exported_program = 4
  
  
  class _ModuleType(Enum):
      """Enum to determine the type of model provided as input"""
  
      nn = 0
      ts = 1
      fx = 2
      ep = 3
  
  
  def _parse_module_type(module: Any) -> _ModuleType:
      if any(
          isinstance(module, t)
          for t in [torch.jit.ScriptModule, torch.jit.ScriptFunction]
      ):
          return _ModuleType.ts
      elif isinstance(module, torch.fx.GraphModule):
          return _ModuleType.fx
      elif isinstance(module, ExportedProgram):
          return _ModuleType.ep
      elif isinstance(module, torch.nn.Module):
          return _ModuleType.nn
      else:
          raise RuntimeError("Module is an unknown format")
  
  
  def _get_target_fe(module_type: _ModuleType, ir: str) -> _IRType:
      module_is_tsable = any(module_type == t for t in [_ModuleType.nn, _ModuleType.ts])
      module_is_fxable = any(module_type == t for t in [_ModuleType.nn, _ModuleType.fx])
      module_is_exportable = module_type == _ModuleType.ep
  
      ir_targets_torchscript = any(ir == opt for opt in ["torchscript", "ts"])
      ir_targets_fx = ir == "fx"
      ir_targets_dynamo = ir == "dynamo"
      ir_targets_torch_compile = ir == "torch_compile"
  
      if module_is_tsable and ir_targets_torchscript:
          if ENABLED_FEATURES.torchscript_frontend:
              return _IRType.ts
          else:
              raise ValueError(
                  "Requested using the TS frontend but the TS frontend is not available in this build of Torch-TensorRT"
              )
      elif module_is_fxable and ir_targets_fx:
          warnings.warn(
              "FX frontend is deprecated. Please use the Dynamo frontend instead.",
              DeprecationWarning,
              stacklevel=2,
          )
          if ENABLED_FEATURES.fx_frontend:
              return _IRType.fx
          else:
              raise ValueError(
                  "Requested using the FX frontend but the FX frontend is not available in this build of Torch-TensorRT"
              )
      elif (module_is_fxable or module_is_exportable) and ir_targets_dynamo:
          if ENABLED_FEATURES.dynamo_frontend:
              return _IRType.dynamo
          else:
              raise ValueError(
                  "Requested using the Dynamo frontend but the Dynamo frontend is not available in this build of Torch-TensorRT"
              )
      elif module_is_fxable and ir_targets_torch_compile:
          if ENABLED_FEATURES.dynamo_frontend:
              return _IRType.torch_compile
          else:
              raise ValueError(
                  "Requested using the Torch-TensorRT torch.compile backend but the Torch-TensorRT torch.compile backend is not available in this build of Torch-TensorRT"
              )
      else:
          if ir == "default":
              # Options are listed in order of preference
              if ENABLED_FEATURES.dynamo_frontend and module_is_fxable:
                  logger.info("ir was set to default, using dynamo frontend")
                  return _IRType.dynamo
              elif ENABLED_FEATURES.torchscript_frontend and module_is_tsable:
                  if ENABLED_FEATURES.dynamo_frontend:
                      logger.warning(
                          "Input is a torchscript module but the ir was not specified (default=dynamo), please set ir=torchscript to suppress the warning."
                      )
                  return _IRType.ts
              elif ENABLED_FEATURES.dynamo_frontend and module_is_exportable:
                  logger.info("ir was set to default, using dynamo frontend")
                  return _IRType.dynamo
              else:
                  raise ValueError(
                      f"Module was provided in an unsupported format\nInstalled frontends:\n\tDynamo - {ENABLED_FEATURES.dynamo_frontend}\n\tTorchScript - {ENABLED_FEATURES.torchscript_frontend}\n\tFX - {ENABLED_FEATURES.fx_frontend})"
                  )
          else:
              raise ValueError("Unknown ir was requested")
  
  
  def compile(
      module: Any,
      ir: str = "default",
      inputs: Optional[Sequence[InputType]] = None,
      arg_inputs: Optional[Sequence[Sequence[Any]]] = None,
      kwarg_inputs: Optional[dict[Any, Any]] = None,
      enabled_precisions: Optional[Set[Union[torch.dtype, dtype]]] = None,
      **kwargs: Any,
  ) -> (
      torch.nn.Module | torch.jit.ScriptModule | torch.fx.GraphModule | Callable[..., Any]
  ):
      """Compile a PyTorch module for NVIDIA GPUs using TensorRT
  
      Takes a existing PyTorch module and a set of settings to configure the compiler
      and using the path specified in ``ir`` lower and compile the module to TensorRT
      returning a PyTorch Module back
  
      Converts specifically the forward method of a Module
  
      Arguments:
          module (Union(torch.nn.Module,torch.jit.ScriptModule): Source module
  
      Keyword Arguments:
          inputs (List[Union(torch_tensorrt.Input, torch.Tensor)]): **Required** List of specifications of input shape, dtype and memory layout for inputs to the module. This argument is required. Input Sizes can be specified as torch sizes, tuples or lists. dtypes can be specified using
              torch datatypes or torch_tensorrt datatypes and you can use either torch devices or the torch_tensorrt device type enum
              to select device type. ::
  
                  inputs=[
                      torch_tensorrt.Input((1, 3, 224, 224)), # Static NCHW input shape for input #1
                      torch_tensorrt.Input(
                          min_shape=(1, 224, 224, 3),
                          opt_shape=(1, 512, 512, 3),
                          max_shape=(1, 1024, 1024, 3),
                          dtype=torch.int32
                          format=torch.channel_last
                      ), # Dynamic input shape for input #2
                      torch.randn((1, 3, 224, 244)) # Use an example tensor and let torch_tensorrt infer settings
                  ]
          arg_inputs (Tuple[Any, ...]): Same as inputs. Alias for better understanding with kwarg_inputs.
          kwarg_inputs (dict[Any, ...]): Optional, kwarg inputs to the module forward function.
          enabled_precision (Set(Union(torch.dtype, torch_tensorrt.dtype))): The set of datatypes that TensorRT can use when selecting kernels
          ir (str): The requested strategy to compile. (Options: default - Let Torch-TensorRT decide, ts - TorchScript with scripting path)
          **kwargs: Additional settings for the specific requested strategy (See submodules for more info)
  
      Returns:
          torch.nn.Module: Compiled Module, when run it will execute via TensorRT
      """
  
      input_list = inputs if inputs is not None else []
      enabled_precisions_set: Set[Union[torch.dtype, dtype]] = (
          enabled_precisions
          if enabled_precisions is not None
          else _defaults.ENABLED_PRECISIONS
      )
  
      module_type = _parse_module_type(module)
      target_ir = _get_target_fe(module_type, ir)
      if target_ir == _IRType.ts:
          ts_mod = module
          if module_type == _ModuleType.nn:
              logger.info(
                  "Module was provided as a torch.nn.Module, trying to script the module with torch.jit.script. In the event of a failure please preconvert your module to TorchScript"
              )
              ts_mod = torch.jit.script(module)
          assert _non_fx_input_interface(input_list)
          compiled_ts_module: torch.jit.ScriptModule = torchscript_compile(
              ts_mod,
              inputs=input_list,
              enabled_precisions=enabled_precisions_set,
              **kwargs,
          )
          return compiled_ts_module
      elif target_ir == _IRType.fx:
          warnings.warn(
              "FX frontend is deprecated. Please use the Dynamo frontend instead.",
              DeprecationWarning,
              stacklevel=2,
          )
          if not ENABLED_FEATURES.fx_frontend:
              raise RuntimeError(
                  "FX frontend is not enabled, cannot compile with target_ir=fx"
              )
  
          if (
              torch.float16 in enabled_precisions_set
              or torch_tensorrt.dtype.half in enabled_precisions_set
          ):
              lower_precision = LowerPrecision.FP16
          elif (
              torch.float32 in enabled_precisions_set
              or torch_tensorrt.dtype.float in enabled_precisions_set
          ):
              lower_precision = LowerPrecision.FP32
          else:
              raise ValueError(f"Precision {enabled_precisions_set} not supported on FX")
  
          def _fx_input_interface(
              inputs: Sequence[Input | torch.Tensor | InputTensorSpec],
          ) -> TypeGuard[List[InputTensorSpec | torch.Tensor]]:
              return all(isinstance(i, (torch.Tensor, InputTensorSpec)) for i in inputs)
  
          assert _fx_input_interface(input_list)
          compiled_fx_module: torch.nn.Module = fx_compile(
              module,
              input_list,
              lower_precision=lower_precision,
              explicit_batch_dimension=True,
              dynamic_batch=False,
              **kwargs,
          )
          return compiled_fx_module
      elif target_ir == _IRType.dynamo:
          # Prepare torch and torchtrt inputs
          if arg_inputs is None and inputs is None:
              raise AssertionError("'arg_inputs' and 'inputs' should not both be None.")
  
          elif arg_inputs is not None and inputs is not None:
              raise AssertionError(
                  "'arg_inputs' and 'inputs' should not be used at the same time."
              )
          if inputs is not None:
              arg_inputs = inputs
  
          if kwarg_inputs is None:
              kwarg_inputs = {}
  
          from torch_tensorrt.dynamo.utils import prepare_inputs
  
          if not isinstance(arg_inputs, collections.abc.Sequence):
              arg_inputs = [arg_inputs]  # type: ignore
  
          # Export the module
          torchtrt_arg_inputs = prepare_inputs(arg_inputs)
          torchtrt_kwarg_inputs = prepare_inputs(kwarg_inputs)
  
          exp_program = dynamo_trace(
              module, torchtrt_arg_inputs, kwarg_inputs=torchtrt_kwarg_inputs, **kwargs
          )
          trt_graph_module = dynamo_compile(
              exp_program,
              arg_inputs=torchtrt_arg_inputs,
              enabled_precisions=enabled_precisions_set,
              **kwargs,
          )
          return trt_graph_module
      elif target_ir == _IRType.torch_compile:
          return torch_compile(
              module, enabled_precisions=enabled_precisions_set, **kwargs
          )
      else:
          raise RuntimeError("Module is an unknown format or the ir requested is unknown")
  
  
  @needs_cross_compile
  def cross_compile_for_windows(
      module: torch.nn.Module,
      file_path: str,
      inputs: Optional[Sequence[Input | torch.Tensor]] = None,
      arg_inputs: Optional[Sequence[Sequence[Any]]] = None,
      kwarg_inputs: Optional[dict[Any, Any]] = None,
      enabled_precisions: Optional[Set[Union[torch.dtype, dtype]]] = None,
      **kwargs: Any,
  ) -> None:
      """Compile a PyTorch module using TensorRT in Linux for Inference in Windows
  
      Takes an existing PyTorch module and a set of settings to configure the compiler
      and it will convert methods to AOT graphs which call equivalent TensorRT serialized
      engine info into the disk in the specified file_path user provided.
      It will then allow user to load the deserialized model from the disk in Windows.
      Note: the model cross compiled for windows in Linux environmen can only be loaded
      in Windows.
  
      Argument:
          module (torch.nn.Module): Source module
          file_path (str): the file path to store the serialized module into the disk
  
      Keyword Arguments:
          inputs (List[Union(torch_tensorrt.Input, torch.Tensor)]): **Required** List of specifications of input shape, dtype and memory layout for inputs to the module. This argument is required. Input Sizes can be specified as torch sizes, tuples or lists. dtypes can be specified using
              torch datatypes or torch_tensorrt datatypes and you can use either torch devices or the torch_tensorrt device type enum
              to select device type. ::
  
                  inputs=[
                      torch_tensorrt.Input((1, 3, 224, 224)), # Static NCHW input shape for input #1
                      torch_tensorrt.Input(
                          min_shape=(1, 224, 224, 3),
                          opt_shape=(1, 512, 512, 3),
                          max_shape=(1, 1024, 1024, 3),
                          dtype=torch.int32
                          format=torch.channel_last
                      ), # Dynamic input shape for input #2
                      torch.randn((1, 3, 224, 244)) # Use an example tensor and let torch_tensorrt infer settings
                  ]
          arg_inputs (Tuple[Any, ...]): Same as inputs. Alias for better understanding with kwarg_inputs.
          kwarg_inputs (dict[Any, ...]): Optional, kwarg inputs to the module forward function.
          enabled_precision (Set(Union(torch.dtype, torch_tensorrt.dtype))): The set of datatypes that TensorRT can use when selecting kernels
          **kwargs: Additional settings for the specific requested strategy (See submodules for more info)
  
      """
  
      if platform.system() != "Linux" or platform.architecture()[0] != "64bit":
          raise RuntimeError(
              f"Cross compile for windows is only supported on x86-64 Linux architecture, current platform: {platform.system()=}, {platform.architecture()[0]=}"
          )
  
      if not file_path:
          raise ValueError("File path cannot be empty. Please provide a valid file path")
  
      enabled_precisions_set: Set[dtype | torch.dtype] = (
          enabled_precisions
          if enabled_precisions is not None
          else _defaults.ENABLED_PRECISIONS
      )
  
      # Prepare torch and torchtrt inputs
      if arg_inputs is None and inputs is None:
          raise AssertionError("'arg_inputs' and 'inputs' should not both be None.")
  
      elif arg_inputs is not None and inputs is not None:
          raise AssertionError(
              "'arg_inputs' and 'inputs' should not be used at the same time."
          )
  
      arg_inputs = inputs or arg_inputs
  
      if kwarg_inputs is None:
          kwarg_inputs = {}
  
      from torch_tensorrt.dynamo.utils import prepare_inputs
  
      if not isinstance(arg_inputs, collections.abc.Sequence):
          arg_inputs = [arg_inputs]  # type: ignore
  
      # Export the module
      torchtrt_arg_inputs = prepare_inputs(arg_inputs)
      torchtrt_kwarg_inputs = prepare_inputs(kwarg_inputs)
  
      exp_program = dynamo_trace(
          module, torchtrt_arg_inputs, kwarg_inputs=torchtrt_kwarg_inputs, **kwargs
      )
      logger.debug("successfully exported the module")
  
      # Compile and save the module
      trt_gm = dynamo_cross_compile_for_windows(
          exp_program,
          arg_inputs=torchtrt_arg_inputs,
          enabled_precisions=enabled_precisions_set,
          **kwargs,
      )
  
      dynamo_save_cross_compiled_exported_program(trt_gm, file_path)
      logger.debug("successfully compiled and saved the module for windows")
  
  
  def torch_compile(module: torch.nn.Module, **kwargs: Any) -> Any:
      """
      Returns a boxed model which is the output of torch.compile.
      This does not compile the model to TRT. Execute this model on
      sample inputs to compile the model to TRT.
      """
      from torch_tensorrt.dynamo.backend import torch_tensorrt_backend
  
      # TODO: Remove dynamic=False when SymInt Dynamic shape support is ready
      boxed_fn = torch.compile(
          module, backend=torch_tensorrt_backend, dynamic=False, options={**kwargs}
      )
  
      return boxed_fn
  
  
  def convert_method_to_trt_engine(
      module: Any,
      method_name: str = "forward",
      inputs: Optional[Sequence[Input | torch.Tensor]] = None,
      arg_inputs: Optional[Sequence[Sequence[Any]]] = None,
      kwarg_inputs: Optional[dict[Any, Any]] = None,
      ir: str = "default",
      enabled_precisions: Optional[Set[Union[torch.dtype, dtype]]] = None,
      **kwargs: Any,
  ) -> bytes:
      """Convert a TorchScript module method to a serialized TensorRT engine
  
      Converts a specified method of a module to a serialized TensorRT engine given a dictionary of conversion settings
  
      Arguments:
          module (Union(torch.nn.Module,torch.jit.ScriptModule): Source module
  
      Keyword Arguments:
          inputs (List[Union(torch_tensorrt.Input, torch.Tensor)]): **Required** List of specifications of input shape, dtype and memory layout for inputs to the module. This argument is required. Input Sizes can be specified as torch sizes, tuples or lists. dtypes can be specified using
              torch datatypes or torch_tensorrt datatypes and you can use either torch devices or the torch_tensorrt device type enum
              to select device type. ::
  
                  input=[
                      torch_tensorrt.Input((1, 3, 224, 224)), # Static NCHW input shape for input #1
                      torch_tensorrt.Input(
                          min_shape=(1, 224, 224, 3),
                          opt_shape=(1, 512, 512, 3),
                          max_shape=(1, 1024, 1024, 3),
                          dtype=torch.int32
                          format=torch.channel_last
                      ), # Dynamic input shape for input #2
                      torch.randn((1, 3, 224, 244)) # Use an example tensor and let torch_tensorrt infer settings
                  ]
  
          arg_inputs (Tuple[Any, ...]): Same as inputs. Alias for better understanding with kwarg_inputs.
          kwarg_inputs (dict[Any, ...]): Optional, kwarg inputs to the module forward function.
          enabled_precision (Set(Union(torch.dtype, torch_tensorrt.dtype))): The set of datatypes that TensorRT can use when selecting kernels
          ir (str): The requested strategy to compile. (Options: default - Let Torch-TensorRT decide, ts - TorchScript with scripting path)
          **kwargs: Additional settings for the specific requested strategy (See submodules for more info)
      Returns:
          bytes: Serialized TensorRT engine, can either be saved to a file or deserialized via TensorRT APIs
      """
      enabled_precisions_set = (
          enabled_precisions if enabled_precisions is not None else {torch.float}
      )
  
      if arg_inputs is None and inputs is None:
          raise AssertionError("'arg_inputs' and 'inputs' should not both be None.")
  
      elif arg_inputs is not None and inputs is not None:
          raise AssertionError(
              "'arg_inputs' and 'inputs' should not be used at the same time."
          )
      arg_inputs = arg_inputs or inputs
  
      module_type = _parse_module_type(module)
      target_ir = _get_target_fe(module_type, ir)
      if target_ir == _IRType.ts:
          ts_mod = module
          if module_type == _ModuleType.nn:
              logger.info(
                  "Module was provided as a torch.nn.Module, trying to script the module with torch.jit.script. In the event of a failure please preconvert your module to TorchScript"
              )
              ts_mod = torch.jit.script(module)
          serialized_engine: bytes = ts_convert_method_to_trt_engine(
              ts_mod,
              inputs=arg_inputs,
              method_name=method_name,
              enabled_precisions=enabled_precisions_set,
              **kwargs,
          )
          return serialized_engine
      elif target_ir == _IRType.fx:
          raise RuntimeError(
              "convert_method_to_trt_engine call is not supported for ir=fx"
          )
      elif target_ir == _IRType.dynamo:
          # Prepare torch and torchtrt inputs
          if kwarg_inputs is None:
              kwarg_inputs = {}
  
          from torch_tensorrt.dynamo.utils import prepare_inputs
  
          if not isinstance(arg_inputs, collections.abc.Sequence):
              arg_inputs = [arg_inputs]  # type: ignore
  
          # Export the module
          torchtrt_arg_inputs = prepare_inputs(arg_inputs)
          torchtrt_kwarg_inputs = prepare_inputs(kwarg_inputs)
  
          exp_program = torch_tensorrt.dynamo.trace(
              module, torchtrt_arg_inputs, kwarg_inputs=torchtrt_kwarg_inputs, **kwargs
          )
  
          return dynamo_convert_exported_program_to_serialized_trt_engine(
              exp_program,
              arg_inputs=tuple(arg_inputs),
              kwarg_inputs=torchtrt_kwarg_inputs,
              enabled_precisions=enabled_precisions_set,
              **kwargs,
          )
      elif target_ir == _IRType.torch_compile:
          raise RuntimeError(
              "convert_method_to_trt_engine call is not supported for ir=torch_compile"
          )
      else:
          raise RuntimeError("Module is an unknown format or the ir requested is unknown")
  
  
  def load_cross_compiled_exported_program(file_path: str = "") -> Any:
      """
      Load an ExportedProgram file in Windows which was previously cross compiled in Linux
  
      Arguments:
          file_path (str): Path to file on the disk
  
      Raises:
          ValueError: If the api is not called in windows or there is no file or the file is not a valid ExportedProgram file
      """
      return dynamo_load_cross_compiled_exported_program(file_path)
  
  
  def load(file_path: str = "") -> Any:
      """
      Load either a Torchscript model or ExportedProgram.
  
      Loads a TorchScript or ExportedProgram file from disk. File type will be detect the type using try, except.
  
      Arguments:
          file_path (str): Path to file on the disk
  
      Raises:
          ValueError: If there is no file or the file is not either a TorchScript file or ExportedProgram file
      """
      try:
          logger.debug(f"Loading the provided file {file_path} using torch.jit.load()")
          ts_module = torch.jit.load(file_path)
          return ts_module
      except Exception:
          logger.info(
              f"Loading the provided file {file_path} via torch.jit.load() failed with the following error",
              exc_info=True,
          )
          pass
  
      try:
          logger.debug(f"Loading the provided file {file_path} using torch.export.load()")
          exp_program = torch.export.load(file_path)
          return exp_program
      except Exception:
          logger.info(
              f"Loading the provided file {file_path} via torch.export.load() failed with the following error",
              exc_info=True,
          )
          raise ValueError(
              f"The file {file_path} doesn't correspond to a valid Torchscript module or ExportedProgram. Please verify the file path."
          )
  
  
  def save(
      module: Any,
      file_path: str = "",
      *,
      output_format: str = "exported_program",
      inputs: Optional[Sequence[torch.Tensor]] = None,
      arg_inputs: Optional[Sequence[torch.Tensor]] = None,
      kwarg_inputs: Optional[dict[str, Any]] = None,
      retrace: bool = True,
      pickle_protocol: int = 2,
      **kwargs: Any,
  ) -> None:
      """
      Save the model to disk in the specified output format.
  
      Arguments:
          module (Optional(torch.jit.ScriptModule | torch.export.ExportedProgram | torch.fx.GraphModule | CudaGraphsTorchTensorRTModule)): Compiled Torch-TensorRT module
          inputs (torch.Tensor): Torch input tensors
          arg_inputs (Tuple[Any, ...]): Same as inputs. Alias for better understanding with kwarg_inputs.
          kwarg_inputs (dict[Any, ...]): Optional, kwarg inputs to the module forward function.
          output_format (str): Format to save the model. Options include exported_program | torchscript | aot_inductor.
          retrace (bool): When the module type is a fx.GraphModule, this option re-exports the graph using torch.export.export(strict=False) to save it.
                  This flag is experimental for now.
          pickle_protocol (int): The pickle protocol to use to save the model. Default is 2. Increase this to 4 or higher for large models
      """
      if isinstance(module, CudaGraphsTorchTensorRTModule):
          module = module.compiled_module
      module_type = _parse_module_type(module)
      accepted_formats = {"exported_program", "torchscript", "aot_inductor"}
      if arg_inputs is not None and not all(
          isinstance(input, torch.Tensor) for input in arg_inputs
      ):
          raise ValueError(
              "Not all inputs provided are torch.tensors. Please provide torch.tensors as inputs"
          )
      if arg_inputs and inputs:
          raise AssertionError(
              "'arg_inputs' and 'inputs' should not be used at the same time."
          )
  
      arg_inputs = inputs or arg_inputs
  
      if kwarg_inputs is None:
          kwarg_inputs = {}
  
      if kwarg_inputs and any(value is None for value in kwarg_inputs.values()):
          raise ValueError("kwargs should not include None.")
      if output_format not in accepted_formats:
          raise ValueError(
              f"Provided output_format {output_format} is not supported. Supported options are exported_program | torchscript"
          )
      if output_format == "aot_inductor" and platform.system() != "Linux":
          raise ValueError(
              f"The AOT Inductor format is only supported on Linux, {platform.system()} is not a supported platform for this format"
          )
      if not file_path:
          raise ValueError("File path cannot be empty. Please provide a valid file path")
  
      if module_type == _ModuleType.nn:
          raise ValueError(
              "Input model is of type nn.Module. Saving nn.Module directly is not supported. Supported model types torch.jit.ScriptModule | torch.fx.GraphModule | torch.export.ExportedProgram."
          )
      elif module_type == _ModuleType.ts:
          if not all(output_format == f for f in ["exported_program", "aot_inductor"]):
              raise ValueError(
                  "Provided model is a torch.jit.ScriptModule but the output_format specified is not torchscript. Other output formats are not supported"
              )
          else:
              if arg_inputs is not None:
                  logger.warning(
                      "Provided model is a torch.jit.ScriptModule, inputs or arg_inputs is not necessary during save."
                  )
              torch.jit.save(module, file_path)
      elif module_type == _ModuleType.ep:
          if output_format == "torchscript":
              raise ValueError(
                  "Provided model is a torch.export.ExportedProgram but the output_format specified is torchscript. Please verify the output_format"
              )
          else:
              if arg_inputs is not None:
                  logger.warning(
                      "Provided model is a torch.export.ExportedProgram, inputs or arg_inputs is not necessary during save, it uses the inputs or arg_inputs provided during export and compile"
                  )
              if output_format == "exported_program":
                  torch.export.save(module, file_path, pickle_protocol=pickle_protocol)
              elif output_format == "aot_inductor":
                  inductor_configs = {}
                  if "inductor_configs" in kwargs:
                      inductor_configs = kwargs["inductor_configs"]
  
                  torch._inductor.aoti_compile_and_package(
                      module,
                      inductor_configs=inductor_configs,
                      package_path=file_path,
                  )
              else:
                  raise RuntimeError(
                      "Attempted to serialize an exported program with an unsupported format. Exported programs support exported_program and aot_inductor"
                  )
      elif module_type == _ModuleType.fx:
          # The module type is torch.fx.GraphModule
          if output_format == "torchscript":
              module_ts = torch.jit.trace(
                  module, arg_inputs, example_kwarg_inputs=kwarg_inputs
              )
              torch.jit.save(module_ts, file_path)
          else:
              if not retrace:
                  from torch_tensorrt.dynamo._exporter import export
  
                  if arg_inputs is not None:
                      logger.warning(
                          "Provided model is a torch.fx.GraphModule and retrace is False, inputs or arg_inputs is not necessary during save."
                      )
                  exp_program = export(module)
                  if output_format == "exported_program":
                      torch.export.save(
                          exp_program, file_path, pickle_protocol=pickle_protocol
                      )
                  elif output_format == "aot_inductor":
                      inductor_configs = {}
                      if "inductor_configs" in kwargs:
                          inductor_configs = kwargs["inductor_configs"]
  
                      torch._inductor.aoti_compile_and_package(
                          exp_program,
                          inductor_configs=inductor_configs,
                          package_path=file_path,
                      )
                  else:
                      raise RuntimeError(
                          "Attempted to serialize an exported program with an unsupported format. Exported programs support exported_program and aot_inductor"
                      )
              else:
                  if arg_inputs is None:
                      raise ValueError(
                          "Provided model is a torch.fx.GraphModule and retrace is True, however the inputs or arg_inputs are empty. Please provide valid torch.tensors as inputs or arg_inputs to trace and save the model"
                      )
                  exp_program = torch.export.export(
                      module,
                      tuple(arg_inputs),
                      kwargs=kwarg_inputs,
                      strict=False,
                  )
  
                  if output_format == "exported_program":
                      torch.export.save(
                          exp_program, file_path, pickle_protocol=pickle_protocol
                      )
                  elif output_format == "aot_inductor":
                      inductor_configs = {}
                      if "inductor_configs" in kwargs:
                          inductor_configs = kwargs["inductor_configs"]
  
                      torch._inductor.aoti_compile_and_package(
                          exp_program,
                          inductor_configs=inductor_configs,
                          package_path=file_path,
                      )
                  else:
                      raise RuntimeError(
                          "Attempted to serialize an exported program with an unsupported format. Exported programs support exported_program and aot_inductor"
                      )
  