



class       __lowerCAmelCase   :



			def __init__(						self       :  Dict			,		A       :  int			,		A       :  List[str]=None			,		A       :  Dict=None)       ->   Optional[int]:



						"""simple docstring"""






						_UpperCAmelCase			=       data
						_UpperCAmelCase			=       previous
						_UpperCAmelCase			=       next_node



			def __str__(						self       :  Union[str, Any])       ->   str:



						"""simple docstring"""






						return F"{self.data}"



			def    _lowerCamelCase	(						self       :  Optional[int])       ->   int:



						"""simple docstring"""






						return self.data



			def    _lowerCamelCase	(						self       :  Optional[int])       ->   str:



						"""simple docstring"""






						return self.next



			def    _lowerCamelCase	(						self       :  List[str])       ->   Dict:



						"""simple docstring"""






						return self.previous







class       __lowerCAmelCase   :



			def __init__(						self       :  Union[str, Any]			,		A       :  List[Any])       ->   str:



						"""simple docstring"""






						_UpperCAmelCase			=       head



			def __iter__(						self       :  List[str])       ->   Dict:



						"""simple docstring"""






						return self



			def    _lowerCamelCase	(						self       :  Optional[Any])       ->   Optional[Any]:



						"""simple docstring"""






						if not self.current:
									raise StopIteration
						else:
									_UpperCAmelCase			=       self.current.get_data()
									_UpperCAmelCase			=       self.current.get_next()
									return value







class       __lowerCAmelCase   :



			def __init__(						self       :  List[str])       ->   Optional[Any]:



						"""simple docstring"""






						_UpperCAmelCase			=       None  # First node in list
						_UpperCAmelCase			=       None  # Last node in list



			def __str__(						self       :  Dict)       ->   Optional[Any]:



						"""simple docstring"""






						_UpperCAmelCase			=       self.head
						_UpperCAmelCase			=       []
						while current is not None:
									nodes.append(current.get_data())
									_UpperCAmelCase			=       current.get_next()
						return " ".join(str(A) for node in nodes)



			def __contains__(						self       :  List[str]			,		A       :  int)       ->   List[str]:



						"""simple docstring"""






						_UpperCAmelCase			=       self.head
						while current:
									if current.get_data() == value:
												return True
									_UpperCAmelCase			=       current.get_next()
						return False



			def __iter__(						self       :  Optional[Any])       ->   List[str]:



						"""simple docstring"""






						return LinkedListIterator(self.head)



			def    _lowerCamelCase	(						self       :  Optional[int])       ->   Union[str, Any]:



						"""simple docstring"""






						if self.head:
									return self.head.get_data()
						return None



			def    _lowerCamelCase	(						self       :  Dict)       ->   int:



						"""simple docstring"""






						if self.tail:
									return self.tail.get_data()
						return None



			def    _lowerCamelCase	(						self       :  List[Any]			,		A       :  Node)       ->   None:



						"""simple docstring"""






						if self.head is None:
									_UpperCAmelCase			=       node
									_UpperCAmelCase			=       node
						else:
									self.insert_before_node(self.head			,		A)



			def    _lowerCamelCase	(						self       :  Optional[Any]			,		A       :  Node)       ->   None:



						"""simple docstring"""






						if self.head is None:
									self.set_head(A)
						else:
									self.insert_after_node(self.tail			,		A)



			def    _lowerCamelCase	(						self       :  Any			,		A       :  int)       ->   None:



						"""simple docstring"""






						_UpperCAmelCase			=       Node(A)
						if self.head is None:
									self.set_head(A)
						else:
									self.set_tail(A)



			def    _lowerCamelCase	(						self       :  List[str]			,		A       :  Node			,		A       :  Node)       ->   None:



						"""simple docstring"""






						_UpperCAmelCase			=       node
						_UpperCAmelCase			=       node.previous

						if node.get_previous() is None:
									_UpperCAmelCase			=       node_to_insert
						else:
									_UpperCAmelCase			=       node_to_insert

						_UpperCAmelCase			=       node_to_insert



			def    _lowerCamelCase	(						self       :  Dict			,		A       :  Node			,		A       :  Node)       ->   None:



						"""simple docstring"""






						_UpperCAmelCase			=       node
						_UpperCAmelCase			=       node.next

						if node.get_next() is None:
									_UpperCAmelCase			=       node_to_insert
						else:
									_UpperCAmelCase			=       node_to_insert

						_UpperCAmelCase			=       node_to_insert



			def    _lowerCamelCase	(						self       :  str			,		A       :  int			,		A       :  int)       ->   None:



						"""simple docstring"""






						_UpperCAmelCase			=       1
						_UpperCAmelCase			=       Node(A)
						_UpperCAmelCase			=       self.head
						while node:
									if current_position == position:
												self.insert_before_node(A			,		A)
												return
									current_position += 1
									_UpperCAmelCase			=       node.next
						self.insert_after_node(self.tail			,		A)



			def    _lowerCamelCase	(						self       :  Optional[Any]			,		A       :  int)       ->   Node:



						"""simple docstring"""






						_UpperCAmelCase			=       self.head
						while node:
									if node.get_data() == item:
												return node
									_UpperCAmelCase			=       node.get_next()
						raise Exception('Node not found')



			def    _lowerCamelCase	(						self       :  Dict			,		A       :  str)       ->   List[Any]:



						"""simple docstring"""






						if (node := self.get_node(A)) is not None:
									if node == self.head:
												_UpperCAmelCase			=       self.head.get_next()

									if node == self.tail:
												_UpperCAmelCase			=       self.tail.get_previous()

									self.remove_node_pointers(A)



			@staticmethod
			def    _lowerCamelCase	(						A       :  Node)       ->   None:



						"""simple docstring"""






						if node.get_next():
									_UpperCAmelCase			=       node.previous

						if node.get_previous():
									_UpperCAmelCase			=       node.next

						_UpperCAmelCase			=       None
						_UpperCAmelCase			=       None



			def    _lowerCamelCase	(						self       :  Optional[int])       ->   List[Any]:



						"""simple docstring"""






						return self.head is None





def 							A     (					)    ->			None:







			'''simple docstring'''


if __name__ == "__main__":
							import doctest

							doctest.testmod()





from typing import TYPE_CHECKING

from ...utils import (
    OptionalDependencyNotAvailable,
    _LazyModule,
    is_tf_available,
    is_tokenizers_available,
    is_torch_available,
)


UpperCAmelCase__       =	{
    "configuration_lxmert": ["LXMERT_PRETRAINED_CONFIG_ARCHIVE_MAP", "LxmertConfig"],
    "tokenization_lxmert": ["LxmertTokenizer"],
}

try:
							if not is_tokenizers_available():
														raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
							pass
else:
							UpperCAmelCase__       =	["LxmertTokenizerFast"]

try:
							if not is_torch_available():
														raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
							pass
else:
							UpperCAmelCase__       =	[
							    "LxmertEncoder",
							    "LxmertForPreTraining",
							    "LxmertForQuestionAnswering",
							    "LxmertModel",
							    "LxmertPreTrainedModel",
							    "LxmertVisualFeatureEncoder",
							    "LxmertXLayer",
							]

try:
							if not is_tf_available():
														raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
							pass
else:
							UpperCAmelCase__       =	[
							    "TF_LXMERT_PRETRAINED_MODEL_ARCHIVE_LIST",
							    "TFLxmertForPreTraining",
							    "TFLxmertMainLayer",
							    "TFLxmertModel",
							    "TFLxmertPreTrainedModel",
							    "TFLxmertVisualFeatureEncoder",
							]


if TYPE_CHECKING:
							from .configuration_lxmert import LXMERT_PRETRAINED_CONFIG_ARCHIVE_MAP, LxmertConfig
							from .tokenization_lxmert import LxmertTokenizer

							try:
														if not is_tokenizers_available():
																					raise OptionalDependencyNotAvailable()
							except OptionalDependencyNotAvailable:
														pass
							else:
														from .tokenization_lxmert_fast import LxmertTokenizerFast

							try:
														if not is_torch_available():
																					raise OptionalDependencyNotAvailable()
							except OptionalDependencyNotAvailable:
														pass
							else:
														from .modeling_lxmert import (
														    LxmertEncoder,
														    LxmertForPreTraining,
														    LxmertForQuestionAnswering,
														    LxmertModel,
														    LxmertPreTrainedModel,
														    LxmertVisualFeatureEncoder,
														    LxmertXLayer,
														)

							try:
														if not is_tf_available():
																					raise OptionalDependencyNotAvailable()
							except OptionalDependencyNotAvailable:
														pass
							else:
														from .modeling_tf_lxmert import (
														    TF_LXMERT_PRETRAINED_MODEL_ARCHIVE_LIST,
														    TFLxmertForPreTraining,
														    TFLxmertMainLayer,
														    TFLxmertModel,
														    TFLxmertPreTrainedModel,
														    TFLxmertVisualFeatureEncoder,
														)

else:
							import sys

							UpperCAmelCase__       =	_LazyModule(__name__, globals()["__file__"], _import_structure, module_spec=__spec__)
