code: 
  
  
  from typing import TYPE_CHECKING
  
  from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_torch_available
  
  
  __SCREAMING_SNAKE_CASE					=						{
      """configuration_musicgen""": [
          """MUSICGEN_PRETRAINED_CONFIG_ARCHIVE_MAP""",
          """MusicgenConfig""",
          """MusicgenDecoderConfig""",
      ],
      """processing_musicgen""": ["""MusicgenProcessor"""],
  }
  
  try:
     if not is_torch_available():
        raise OptionalDependencyNotAvailable()
  except OptionalDependencyNotAvailable:
     pass
  else:
     __SCREAMING_SNAKE_CASE					=						[
         """MUSICGEN_PRETRAINED_MODEL_ARCHIVE_LIST""",
         """MusicgenForConditionalGeneration""",
         """MusicgenForCausalLM""",
         """MusicgenModel""",
         """MusicgenPreTrainedModel""",
     ]
  
  if TYPE_CHECKING:
     from .configuration_musicgen import (
         MUSICGEN_PRETRAINED_CONFIG_ARCHIVE_MAP,
         MusicgenConfig,
         MusicgenDecoderConfig,
     )
     from .processing_musicgen import MusicgenProcessor
  
     try:
        if not is_torch_available():
           raise OptionalDependencyNotAvailable()
     except OptionalDependencyNotAvailable:
        pass
     else:
        from .modeling_musicgen import (
            MUSICGEN_PRETRAINED_MODEL_ARCHIVE_LIST,
            MusicgenForCausalLM,
            MusicgenForConditionalGeneration,
            MusicgenModel,
            MusicgenPreTrainedModel,
        )
  
  else:
     import sys
  
     __SCREAMING_SNAKE_CASE					=						_LazyModule(__name__, globals()["""__file__"""], _import_structure, module_spec=__spec__)
  
style_context: 
  
  
  """simple docstring"""
  
  
  
  
  from __future__ import annotations
  
  from collections.abc import Iterator
  from typing import Any
  
  
  
  
  
  class __snake_case		:
  
  
  
  
  
  
  
     """simple docstring"""
  
  
  
  
     def __init__(		self							:List[Any]				,  UpperCamelCase__							:Any       ):
            _a          =				data
            _a          =				None
  
  
  
  
     def __str__(		self							:Any       ):
            return f'{self.data}'
  
  
  
  
  
  
  class __snake_case		:
  
  
  
  
  
  
  
     """simple docstring"""
  
  
  
  
     def __init__(		self							:Any       ):
            _a          =				None
            _a          =				None
  
  
  
  
     def __iter__(		self							:List[str]       ):
            _a          =				self.front
            while node:
                   yield node.data
                   _a          =				node.next
  
  
  
  
     def __len__(		self							:List[str]       ):
            return len(tuple(iter(self       )       )       )
  
  
  
  
     def __str__(		self							:Union[str, Any]       ):
            return " <- ".join(str(UpperCamelCase__       ) for item in self       )
  
  
  
  
     def SCREAMING_SNAKE_CASE_      (		self							:Any       ):
            return len(self       ) == 0
  
  
  
  
     def SCREAMING_SNAKE_CASE_      (		self							:List[str]				,  UpperCamelCase__							:Any       ):
            _a          =				Node(UpperCamelCase__       )
            if self.is_empty():
                   _a          =				_a          =				node
            else:
                   assert isinstance(self.rear				,  UpperCamelCase__       )
                   _a          =				node
                   _a          =				node
  
  
  
  
     def SCREAMING_SNAKE_CASE_      (		self							:Tuple       ):
            if self.is_empty():
                   raise IndexError("dequeue from empty queue"       )
            assert isinstance(self.front				,  UpperCamelCase__       )
            _a          =				self.front
            _a          =				self.front.next
            if self.front is None:
                   _a          =				None
            return node.data
  
  
  
  
     def SCREAMING_SNAKE_CASE_      (		self							:int       ):
            _a          =				_a          =				None
  
  
  if __name__ == "__main__":
     from doctest import testmod
  
     testmod()
  