
class       a_   :






			def __init__(			self							, __UpperCamelCase     ):
									_lowercase									=				data
									_lowercase									=				None
									_lowercase									=				None






			def __str__(			self     ):
									return f"""{self.data}"""







class       a_   :






			def __init__(			self     ):
									_lowercase									=				None
									_lowercase									=				None






			def __iter__(			self     ):
									_lowercase									=				self.head
									while node:
															yield node.data
															_lowercase									=				node.next






			def __str__(			self     ):
									return "->".join([str(__UpperCamelCase     ) for item in self]     )






			def __len__(			self     ):
									return sum(1 for _ in self     )






			def       UpperCamelCase_							(			self							, __UpperCamelCase     ):
									self.insert_at_nth(0							, __UpperCamelCase     )






			def       UpperCamelCase_							(			self							, __UpperCamelCase     ):
									self.insert_at_nth(len(self     )							, __UpperCamelCase     )






			def       UpperCamelCase_							(			self							, __UpperCamelCase							, __UpperCamelCase     ):
									_lowercase									=				len(self     )

									if not 0 <= index <= length:
															raise IndexError("""list index out of range"""     )
									_lowercase									=				Node(__UpperCamelCase     )
									if self.head is None:
															_lowercase									=				_lowercase									=				new_node
									elif index == 0:
															_lowercase									=				new_node
															_lowercase									=				self.head
															_lowercase									=				new_node
									elif index == length:
															_lowercase									=				new_node
															_lowercase									=				self.tail
															_lowercase									=				new_node
									else:
															_lowercase									=				self.head
															for _ in range(0							, __UpperCamelCase     ):
																					_lowercase									=				temp.next
															_lowercase									=				new_node
															_lowercase									=				temp.previous
															_lowercase									=				temp
															_lowercase									=				new_node






			def       UpperCamelCase_							(			self     ):
									return self.delete_at_nth(0     )






			def       UpperCamelCase_							(			self     ):
									return self.delete_at_nth(len(self     ) - 1     )






			def       UpperCamelCase_							(			self							, __UpperCamelCase     ):
									_lowercase									=				len(self     )

									if not 0 <= index <= length - 1:
															raise IndexError("""list index out of range"""     )
									_lowercase									=				self.head  # default first node
									if length == 1:
															_lowercase									=				_lowercase									=				None
									elif index == 0:
															_lowercase									=				self.head.next
															_lowercase									=				None
									elif index == length - 1:
															_lowercase									=				self.tail
															_lowercase									=				self.tail.previous
															_lowercase									=				None
									else:
															_lowercase									=				self.head
															for _ in range(0							, __UpperCamelCase     ):
																					_lowercase									=				temp.next
															_lowercase									=				temp
															_lowercase									=				temp.previous
															_lowercase									=				temp.next
									return delete_node.data






			def       UpperCamelCase_							(			self							, __UpperCamelCase     ):
									_lowercase									=				self.head

									while current.data != data:  # Find the position to delete
															if current.next:
																					_lowercase									=				current.next
															else:  # We have reached the end an no value matches
																					raise ValueError("""No data matching given value"""     )

									if current == self.head:
															self.delete_head()

									elif current == self.tail:
															self.delete_tail()

									else:  # Before: 1 <--> 2(current) <--> 3
															_lowercase									=				current.next  # 1 --> 3
															_lowercase									=				current.previous  # 1 <--> 3
									return data






			def       UpperCamelCase_							(			self     ):
									return len(self     ) == 0







def   UpperCamelCase__     (    )     ->    None:
						_lowercase									=				DoublyLinkedList()
						assert linked_list.is_empty() is True
						assert str(SCREAMING_SNAKE_CASE_					) == ""

						try:
												linked_list.delete_head()
												raise AssertionError  # This should not happen.
						except IndexError:
												assert True  # This should happen.

						try:
												linked_list.delete_tail()
												raise AssertionError  # This should not happen.
						except IndexError:
												assert True  # This should happen.

						for i in range(10					):
												assert len(SCREAMING_SNAKE_CASE_					) == i
												linked_list.insert_at_nth(SCREAMING_SNAKE_CASE_		,      i + 1					)
						assert str(SCREAMING_SNAKE_CASE_					) == "->".join(str(SCREAMING_SNAKE_CASE_					) for i in range(1		,      11					)					)

						linked_list.insert_at_head(0					)
						linked_list.insert_at_tail(11					)
						assert str(SCREAMING_SNAKE_CASE_					) == "->".join(str(SCREAMING_SNAKE_CASE_					) for i in range(0		,      12					)					)

						assert linked_list.delete_head() == 0
						assert linked_list.delete_at_nth(9					) == 10
						assert linked_list.delete_tail() == 11
						assert len(SCREAMING_SNAKE_CASE_					) == 9
						assert str(SCREAMING_SNAKE_CASE_					) == "->".join(str(SCREAMING_SNAKE_CASE_					) for i in range(1		,      10					)					)


if __name__ == "__main__":
		from doctest import testmod

		testmod()

from typing import TYPE_CHECKING

from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_torch_available, is_vision_available


A		:   int         =    {'''configuration_vilt''': ['''VILT_PRETRAINED_CONFIG_ARCHIVE_MAP''', '''ViltConfig''']}

try:
		if not is_vision_available():
				raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
		pass
else:
		A		:   int         =    ['''ViltFeatureExtractor''']
		A		:   List[Any]         =    ['''ViltImageProcessor''']
		A		:   Dict         =    ['''ViltProcessor''']

try:
		if not is_torch_available():
				raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
		pass
else:
		A		:   Tuple         =    [
		    '''VILT_PRETRAINED_MODEL_ARCHIVE_LIST''',
		    '''ViltForImageAndTextRetrieval''',
		    '''ViltForImagesAndTextClassification''',
		    '''ViltForTokenClassification''',
		    '''ViltForMaskedLM''',
		    '''ViltForQuestionAnswering''',
		    '''ViltLayer''',
		    '''ViltModel''',
		    '''ViltPreTrainedModel''',
		]


if TYPE_CHECKING:
		from .configuration_vilt import VILT_PRETRAINED_CONFIG_ARCHIVE_MAP, ViltConfig

		try:
				if not is_vision_available():
						raise OptionalDependencyNotAvailable()
		except OptionalDependencyNotAvailable:
				pass
		else:
				from .feature_extraction_vilt import ViltFeatureExtractor
				from .image_processing_vilt import ViltImageProcessor
				from .processing_vilt import ViltProcessor

		try:
				if not is_torch_available():
						raise OptionalDependencyNotAvailable()
		except OptionalDependencyNotAvailable:
				pass
		else:
				from .modeling_vilt import (
				    VILT_PRETRAINED_MODEL_ARCHIVE_LIST,
				    ViltForImageAndTextRetrieval,
				    ViltForImagesAndTextClassification,
				    ViltForMaskedLM,
				    ViltForQuestionAnswering,
				    ViltForTokenClassification,
				    ViltLayer,
				    ViltModel,
				    ViltPreTrainedModel,
				)


else:
		import sys

		A		:   Dict         =    _LazyModule(__name__, globals()['''__file__'''], _import_structure)