



'''simple docstring'''





from typing import Any







class        UpperCAmelCase_			:
    """simple docstring"""







    def __init__(       self   :	str					,	snake_case_   :	Any		):
          snake_case__    :       Tuple       		= data
          snake_case__    :       Dict       		= None




    def __repr__(       self   :	Any		):
          return f"Node({self.data})"







class        UpperCAmelCase_			:
    """simple docstring"""







    def __init__(       self   :	Optional[Any]		):
          snake_case__    :       int       		= None




    def __iter__(       self   :	Optional[Any]		):
          snake_case__    :       Optional[Any]       		= self.head
          while node:
                yield node.data
                snake_case__    :       List[Any]       		= node.next




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




    def __repr__(       self   :	List[Any]		):
          return "->".join([str(snake_case_		) for item in self]		)




    def __getitem__(       self   :	Optional[int]					,	snake_case_   :	int		):
          if not 0 <= index < len(self		):
                raise ValueError("""list index out of range."""		)
          for i, node in enumerate(self		):
                if i == index:
                      return node
          return None




    def __setitem__(       self   :	Dict					,	snake_case_   :	int					,	snake_case_   :	Any		):
          if not 0 <= index < len(self		):
                raise ValueError("""list index out of range."""		)
          snake_case__    :       str       		= self.head
          for _ in range(snake_case_		):
                snake_case__    :       Optional[Any]       		= current.next
          snake_case__    :       Tuple       		= data




    def lowerCamelCase			(       self   :	Any					,	snake_case_   :	Any		):
          self.insert_nth(len(self		)					,	snake_case_		)




    def lowerCamelCase			(       self   :	List[str]					,	snake_case_   :	Any		):
          self.insert_nth(0					,	snake_case_		)




    def lowerCamelCase			(       self   :	Optional[int]					,	snake_case_   :	int					,	snake_case_   :	Any		):
          if not 0 <= index <= len(self		):
                raise IndexError("""list index out of range"""		)
          snake_case__    :       List[str]       		= Node(snake_case_		)
          if self.head is None:
                snake_case__    :       int       		= new_node
          elif index == 0:
                snake_case__    :       Union[str, Any]       		= self.head  # link new_node to head
                snake_case__    :       Optional[Any]       		= new_node
          else:
                snake_case__    :       int       		= self.head
                for _ in range(index - 1		):
                      snake_case__    :       Dict       		= temp.next
                snake_case__    :       List[Any]       		= temp.next
                snake_case__    :       Optional[Any]       		= new_node




    def lowerCamelCase			(       self   :	List[Any]		):  # print every node data
          print(self		)




    def lowerCamelCase			(       self   :	Optional[Any]		):
          return self.delete_nth(0		)




    def lowerCamelCase			(       self   :	Union[str, Any]		):  # delete from tail
          return self.delete_nth(len(self		) - 1		)




    def lowerCamelCase			(       self   :	int					,	snake_case_   :	int = 0		):
          if not 0 <= index <= len(self		) - 1:  # test if index is valid
                raise IndexError("""List index out of range."""		)
          snake_case__    :       List[str]       		= self.head  # default first node
          if index == 0:
                snake_case__    :       int       		= self.head.next
          else:
                snake_case__    :       Dict       		= self.head
                for _ in range(index - 1		):
                      snake_case__    :       List[str]       		= temp.next
                snake_case__    :       List[str]       		= temp.next
                snake_case__    :       Union[str, Any]       		= temp.next.next
          return delete_node.data




    def lowerCamelCase			(       self   :	List[Any]		):
          return self.head is None




    def lowerCamelCase			(       self   :	int		):
          snake_case__    :       Dict       		= None
          snake_case__    :       Optional[int]       		= self.head

          while current:
                # Store the current node's next node.
                snake_case__    :       List[str]       		= current.next
                # Make the current node's next point backwards
                snake_case__    :       Optional[Any]       		= prev
                # Make the previous node be the current node
                snake_case__    :       Optional[int]       		= current
                # Make the current node the next node (to progress iteration)
                snake_case__    :       Optional[Any]       		= next_node
          # Return prev in order to put the head at the end
          snake_case__    :       Optional[Any]       		= prev





def 		__snake_case(							)						->					None:
      snake_case__    :       int       		= LinkedList()
      assert linked_list.is_empty() is True
      assert str(_lowerCAmelCase						) == ""

      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(_lowerCAmelCase						) == i
            linked_list.insert_nth(_lowerCAmelCase	,  i + 1						)
      assert str(_lowerCAmelCase						) == "->".join(str(_lowerCAmelCase						) for i in range(1	,  11						)						)

      linked_list.insert_head(0						)
      linked_list.insert_tail(11						)
      assert str(_lowerCAmelCase						) == "->".join(str(_lowerCAmelCase						) for i in range(0	,  12						)						)

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

      assert all(linked_list[i] == i + 1 for i in range(0	,  9						)						) is True

      for i in range(0	,  9						):
            snake_case__    :       List[str]       		= -i
      assert all(linked_list[i] == -i for i in range(0	,  9						)						) is True

      linked_list.reverse()
      assert str(_lowerCAmelCase						) == "->".join(str(_lowerCAmelCase						) for i in range(-8	,  1						)						)





def 		__snake_case(							)						->					None:
      snake_case__    :       Union[str, Any]       		= [
          -9,
          100,
          Node(77_345_112						),
          """dlrow olleH""",
          7,
          5_555,
          0,
          -192.5_5555,
          """Hello, world!""",
          77.9,
          Node(10						),
          None,
          None,
          12.20,
      ]
      snake_case__    :       Optional[Any]       		= LinkedList()

      for i in test_input:
            linked_list.insert_tail(_lowerCAmelCase						)

      # Check if it's empty or not
      assert linked_list.is_empty() is False
      assert (
          str(_lowerCAmelCase						) == "-9->100->Node(77345112)->dlrow olleH->7->5555->0->"
          "-192.55555->Hello, world!->77.9->Node(10)->None->None->12.2"
      )

      # Delete the head
      snake_case__    :       Tuple       		= linked_list.delete_head()
      assert result == -9
      assert (
          str(_lowerCAmelCase						) == "100->Node(77345112)->dlrow olleH->7->5555->0->-192.55555->"
          "Hello, world!->77.9->Node(10)->None->None->12.2"
      )

      # Delete the tail
      snake_case__    :       Dict       		= linked_list.delete_tail()
      assert result == 12.2
      assert (
          str(_lowerCAmelCase						) == "100->Node(77345112)->dlrow olleH->7->5555->0->-192.55555->"
          "Hello, world!->77.9->Node(10)->None->None"
      )

      # Delete a node in specific location in linked list
      snake_case__    :       Tuple       		= linked_list.delete_nth(10						)
      assert result is None
      assert (
          str(_lowerCAmelCase						) == "100->Node(77345112)->dlrow olleH->7->5555->0->-192.55555->"
          "Hello, world!->77.9->Node(10)->None"
      )

      # Add a Node instance to its head
      linked_list.insert_head(Node("""Hello again, world!"""						)						)
      assert (
          str(_lowerCAmelCase						)
          == "Node(Hello again, world!)->100->Node(77345112)->dlrow olleH->"
          "7->5555->0->-192.55555->Hello, world!->77.9->Node(10)->None"
      )

      # Add None to its tail
      linked_list.insert_tail(_lowerCAmelCase						)
      assert (
          str(_lowerCAmelCase						)
          == "Node(Hello again, world!)->100->Node(77345112)->dlrow olleH->"
          "7->5555->0->-192.55555->Hello, world!->77.9->Node(10)->None->None"
      )

      # Reverse the linked list
      linked_list.reverse()
      assert (
          str(_lowerCAmelCase						)
          == "None->None->Node(10)->77.9->Hello, world!->-192.55555->0->5555->"
          "7->dlrow olleH->Node(77345112)->100->Node(Hello again, world!)"
      )





def 		__snake_case(							)						->					int:
      from doctest import testmod

      testmod()

      snake_case__    :       Optional[int]       		= LinkedList()
      linked_list.insert_head(input("""Inserting 1st at head """						).strip()						)
      linked_list.insert_head(input("""Inserting 2nd at head """						).strip()						)
      print("""\nPrint list:"""						)
      linked_list.print_list()
      linked_list.insert_tail(input("""\nInserting 1st at tail """						).strip()						)
      linked_list.insert_tail(input("""Inserting 2nd at tail """						).strip()						)
      print("""\nPrint list:"""						)
      linked_list.print_list()
      print("""\nDelete head"""						)
      linked_list.delete_head()
      print("""Delete tail"""						)
      linked_list.delete_tail()
      print("""\nPrint list:"""						)
      linked_list.print_list()
      print("""\nReverse linked list"""						)
      linked_list.reverse()
      print("""\nPrint list:"""						)
      linked_list.print_list()
      print("""\nString representation of linked list:"""						)
      print(_lowerCAmelCase						)
      print("""\nReading/changing Node data using indexing:"""						)
      print(f"Element at Position 1: {linked_list[1]}"						)
      snake_case__    :       Optional[Any]       		= input("""Enter New Value: """						).strip()
      print("""New list:"""						)
      print(_lowerCAmelCase						)
      print(f"length of linked_list is : {len(_lowerCAmelCase						)}"						)


if __name__ == "__main__":
       main()





'''simple docstring'''





import baseaa
import io
import json
import os
from copy import deepcopy

from ..optimizer import AcceleratedOptimizer
from ..scheduler import AcceleratedScheduler







class        UpperCAmelCase_			:
    """simple docstring"""







    def __init__(       self   :	Tuple					,	snake_case_   :	List[str]		):
          if isinstance(snake_case_					,	snake_case_		):
                # Don't modify user's data should they want to reuse it (e.g. in tests), because once we
                # modified it, it will not be accepted here again, since `auto` values would have been overridden
                snake_case__    :       Optional[Any]       		= deepcopy(snake_case_		)
          elif os.path.exists(snake_case_		):
                with io.open(snake_case_					,	"""r"""					,	encoding="""utf-8"""		) as f:
                      snake_case__    :       Union[str, Any]       		= json.load(snake_case_		)
          else:
                try:
                      snake_case__    :       List[Any]       		= baseaa.urlsafe_baadecode(snake_case_		).decode("""utf-8"""		)
                      snake_case__    :       Optional[int]       		= json.loads(snake_case_		)
                except (UnicodeDecodeError, AttributeError, ValueError):
                      raise ValueError(
                          f"Expected a string path to an existing deepspeed config, or a dictionary, or a base64 encoded string. Received: {config_file_or_dict}"		)

          snake_case__    :       str       		= config

          self.set_stage_and_offload()




    def lowerCamelCase			(       self   :	int		):
          # zero stage - this is done as early as possible, before model is created, to allow
          # ``is_deepspeed_zero3_enabled`` query and getting to the early deepspeed config object
          # during ``zero.Init()`` which needs to know the dtype, and some other hparams.
          snake_case__    :       Union[str, Any]       		= self.get_value("""zero_optimization.stage"""					,	-1		)

          # offload
          snake_case__    :       Optional[Any]       		= False
          if self.is_zeroa() or self.is_zeroa():
                snake_case__    :       int       		= set(["""cpu""", """nvme"""]		)
                snake_case__    :       Any       		= set(
                    [
                        self.get_value("""zero_optimization.offload_optimizer.device"""		),
                        self.get_value("""zero_optimization.offload_param.device"""		),
                    ]		)
                if len(offload_devices & offload_devices_valid		) > 0:
                      snake_case__    :       List[Any]       		= True




    def lowerCamelCase			(       self   :	Any					,	snake_case_   :	Optional[Any]		):
          snake_case__    :       Optional[Any]       		= self.config

          # find the config node of interest if it exists
          snake_case__    :       List[Any]       		= ds_key_long.split("""."""		)
          snake_case__    :       Tuple       		= nodes.pop()
          for node in nodes:
                snake_case__    :       Optional[Any]       		= config.get(snake_case_		)
                if config is None:
                      return None, ds_key

          return config, ds_key




    def lowerCamelCase			(       self   :	List[Any]					,	snake_case_   :	int					,	snake_case_   :	List[str]=None		):
          snake_case__		,							snake_case__    :       Dict       		= self.find_config_node(snake_case_		)
          if config is None:
                return default
          return config.get(snake_case_					,	snake_case_		)




    def lowerCamelCase			(       self   :	Dict					,	snake_case_   :	Optional[int]					,	snake_case_   :	int=False		):
          snake_case__    :       Dict       		= self.config

          # find the config node of interest if it exists
          snake_case__    :       str       		= ds_key_long.split("""."""		)
          for node in nodes:
                snake_case__    :       Union[str, Any]       		= config
                snake_case__    :       List[Any]       		= config.get(snake_case_		)
                if config is None:
                      if must_exist:
                            raise ValueError(f"Can't find {ds_key_long} entry in the config: {self.config}"		)
                      else:
                            return

        # if found remove it
          if parent_config is not None:
                parent_config.pop(snake_case_		)




    def lowerCamelCase			(       self   :	str					,	snake_case_   :	Optional[Any]		):
          snake_case__    :       Dict       		= self.get_value(snake_case_		)
          return False if value is None else bool(snake_case_		)




    def lowerCamelCase			(       self   :	List[str]					,	snake_case_   :	Union[str, Any]		):
          snake_case__    :       Optional[int]       		= self.get_value(snake_case_		)
          return False if value is None else not bool(snake_case_		)




    def lowerCamelCase			(       self   :	Optional[Any]		):
          return self._stage == 2




    def lowerCamelCase			(       self   :	Dict		):
          return self._stage == 3




    def lowerCamelCase			(       self   :	List[Any]		):
          return self._offload







class        UpperCAmelCase_			:
    """simple docstring"""







    def __init__(       self   :	Any					,	snake_case_   :	List[Any]		):
          snake_case__    :       Tuple       		= engine




    def lowerCamelCase			(       self   :	Dict					,	snake_case_   :	Optional[Any]					,	**snake_case_   :	int		):
          # runs backpropagation and handles mixed precision
          self.engine.backward(snake_case_					,	**snake_case_		)

          # Deepspeed's `engine.step` performs the following operations:
          # - gradient accumulation check
          # - gradient clipping
          # - optimizer step
          # - zero grad
          # - checking overflow
          # - lr_scheduler step (only if engine.lr_scheduler is not None)
          self.engine.step()
          # and this plugin overrides the above calls with no-ops when Accelerate runs under
          # Deepspeed, but allows normal functionality for non-Deepspeed cases thus enabling a simple
          # training loop that works transparently under many training regimes.







class        UpperCAmelCase_			(			_a      ):
    """simple docstring"""







    def __init__(       self   :	Tuple					,	snake_case_   :	Any		):
          super().__init__(snake_case_					,	device_placement=snake_case_					,	scaler=snake_case_		)
          snake_case__    :       Optional[int]       		= hasattr(self.optimizer					,	"""overflow"""		)




    def lowerCamelCase			(       self   :	int					,	snake_case_   :	Optional[Any]=None		):
          pass  # `accelerator.backward(loss)` is doing that automatically. Therefore, its implementation is not needed




    def lowerCamelCase			(       self   :	List[Any]		):
          pass  # `accelerator.backward(loss)` is doing that automatically. Therefore, its implementation is not needed




    @property
    def lowerCamelCase			(       self   :	List[str]		):
          if self.__has_overflow__:
                return self.optimizer.overflow
          return False







class        UpperCAmelCase_			(			_a      ):
    """simple docstring"""







    def __init__(       self   :	Tuple					,	snake_case_   :	Optional[Any]					,	snake_case_   :	Tuple		):
          super().__init__(snake_case_					,	snake_case_		)




    def lowerCamelCase			(       self   :	Optional[int]		):
          pass  # `accelerator.backward(loss)` is doing that automatically. Therefore, its implementation is not needed







class        UpperCAmelCase_			:
    """simple docstring"""







    def __init__(       self   :	Optional[int]					,	snake_case_   :	Dict					,	snake_case_   :	int=0.001					,	snake_case_   :	Optional[Any]=0					,	**snake_case_   :	List[Any]		):
          snake_case__    :       int       		= params
          snake_case__    :       Optional[Any]       		= lr
          snake_case__    :       Any       		= weight_decay
          snake_case__    :       Optional[Any]       		= kwargs







class        UpperCAmelCase_			:
    """simple docstring"""







    def __init__(       self   :	Dict					,	snake_case_   :	str					,	snake_case_   :	Optional[int]=None					,	snake_case_   :	Any=0					,	**snake_case_   :	List[str]		):
          snake_case__    :       List[Any]       		= optimizer
          snake_case__    :       List[Any]       		= total_num_steps
          snake_case__    :       List[Any]       		= warmup_num_steps
          snake_case__    :       Optional[Any]       		= kwargs
