


"""simple docstring"""



from typing import Any







class _lowerCAmelCase    :







   def __init__(     self						,     UpperCamelCase__						)     ->		Optional[Any]:

       '''simple docstring'''




       snake_case   :				Any				 =   data
       snake_case   :				Any				 =   None







   def __repr__(     self						)     ->		str:

       '''simple docstring'''




       return F'Node({self.data})'







class _lowerCAmelCase    :







   def __init__(     self						)     ->		Any:

       '''simple docstring'''




       snake_case   :				Union[str, Any]				 =   None







   def __iter__(     self						)     ->		Any:

       '''simple docstring'''




       snake_case   :				Dict				 =   self.head
       while node:
           yield node.data
           snake_case   :				Any				 =   node.next







   def __len__(     self						)     ->		int:

       '''simple docstring'''




       return sum(1 for _ in self						)







   def __repr__(     self						)     ->		str:

       '''simple docstring'''




       return "->".join([str(UpperCamelCase__						) for item in self]						)







   def __getitem__(     self						,     UpperCamelCase__						)     ->		Any:

       '''simple docstring'''




       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						,     UpperCamelCase__						,     UpperCamelCase__						)     ->		None:

       '''simple docstring'''




       if not 0 <= index < len(self						):
           raise ValueError("list index out of range."						)
       snake_case   :				Optional[Any]				 =   self.head
       for _ in range(UpperCamelCase__						):
           snake_case   :				str				 =   current.next
       snake_case   :				Optional[int]				 =   data







   def 			lowerCamelCase		(     self						,     UpperCamelCase__						)     ->		None:

       '''simple docstring'''




       self.insert_nth(len(self						)						,     UpperCamelCase__						)







   def 			lowerCamelCase		(     self						,     UpperCamelCase__						)     ->		None:

       '''simple docstring'''




       self.insert_nth(0						,     UpperCamelCase__						)







   def 			lowerCamelCase		(     self						,     UpperCamelCase__						,     UpperCamelCase__						)     ->		None:

       '''simple docstring'''




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







   def 			lowerCamelCase		(     self						)     ->		None:  # print every node data

       '''simple docstring'''




       print(self						)







   def 			lowerCamelCase		(     self						)     ->		Any:

       '''simple docstring'''




       return self.delete_nth(0						)







   def 			lowerCamelCase		(     self						)     ->		Any:  # delete from tail

       '''simple docstring'''




       return self.delete_nth(len(self						) - 1						)







   def 			lowerCamelCase		(     self						,     UpperCamelCase__ = 0						)     ->		Any:

       '''simple docstring'''




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







   def 			lowerCamelCase		(     self						)     ->		bool:

       '''simple docstring'''




       return self.head is None







   def 			lowerCamelCase		(     self						)     ->		None:

       '''simple docstring'''




       snake_case   :				List[str]				 =   None
       snake_case   :				Optional[int]				 =   self.head

       while current:
           # Store the current node's next node.
           snake_case   :				Any				 =   current.next
           # Make the current node's next point backwards
           snake_case   :				Union[str, 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   :				Dict				 =   next_node
       # Return prev in order to put the head at the end
       snake_case   :				int				 =   prev







def   __lowerCAmelCase						(						)     ->						None:


    """simple docstring"""





    snake_case   :				List[str]				 =   LinkedList()
    assert linked_list.is_empty() is True
    assert str(lowercase			) == ""

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

    linked_list.insert_head(0			)
    linked_list.insert_tail(11			)
    assert str(lowercase			) == "->".join(str(lowercase			) 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(lowercase			) == 9
    assert str(lowercase			) == "->".join(str(lowercase			) 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   :				Dict				 =   -i
    assert all(linked_list[i] == -i for i in range(0						,							9			)			) is True

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







def   __lowerCAmelCase						(						)     ->						None:


    """simple docstring"""





    snake_case   :				Tuple				 =   [
        -9,
        100,
        Node(7734_5112			),
        "dlrow olleH",
        7,
        5555,
        0,
        -192.5_5555,
        "Hello, world!",
        77.9,
        Node(10			),
        None,
        None,
        12.20,
    ]
    snake_case   :				List[str]				 =   LinkedList()

    for i in test_input:
        linked_list.insert_tail(lowercase			)

    # Check if it's empty or not
    assert linked_list.is_empty() is False
    assert (
        str(lowercase			) == "-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   :				int				 =   linked_list.delete_head()
    assert result == -9
    assert (
        str(lowercase			) == "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   :				Tuple				 =   linked_list.delete_tail()
    assert result == 12.2
    assert (
        str(lowercase			) == "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   :				List[str]				 =   linked_list.delete_nth(10			)
    assert result is None
    assert (
        str(lowercase			) == "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(lowercase			)
        == "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(lowercase			)
    assert (
        str(lowercase			)
        == "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(lowercase			)
        == "None->None->Node(10)->77.9->Hello, world!->-192.55555->0->5555->"
        "7->dlrow olleH->Node(77345112)->100->Node(Hello again, world!)"
    )







def   __lowerCAmelCase						(						)     ->						List[Any]:


    """simple docstring"""





    from doctest import testmod

    testmod()

    snake_case   :				Dict				 =   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(lowercase			)
    print("\nReading/changing Node data using indexing:"			)
    print(F'Element at Position 1: {linked_list[1]}'			)
    snake_case   :				str				 =   input("Enter New Value: "			).strip()
    print("New list:"			)
    print(lowercase			)
    print(F'length of linked_list is : {len(lowercase			)}'			)


if __name__ == "__main__":
  main()






"""simple docstring"""



import unittest

from transformers import is_tf_available
from transformers.testing_utils import require_tf


if is_tf_available():
  import tensorflow as tf
  from tensorflow.python.eager import context
  from tensorflow.python.framework import ops

  from transformers import GradientAccumulator, create_optimizer







@require_tf
class _lowerCAmelCase    (				unittest.TestCase     ):







   def 			lowerCamelCase		(     self						,     UpperCamelCase__						,     UpperCamelCase__						,     UpperCamelCase__						)     ->		Optional[Any]:

       '''simple docstring'''




       self.assertEqual(len(UpperCamelCase__						)						,     len(UpperCamelCase__						)						)
       for a, b in zip(UpperCamelCase__						,     UpperCamelCase__						):
           self.assertAlmostEqual(UpperCamelCase__						,     UpperCamelCase__						,     delta=UpperCamelCase__						)







   def 			lowerCamelCase		(     self						)     ->		Any:

       '''simple docstring'''




       snake_case   :				List[Any]				 =   GradientAccumulator()
       accumulator([tf.constant([1.0, 2.0]						)]						)
       accumulator([tf.constant([-2.0, 1.0]						)]						)
       accumulator([tf.constant([-1.0, 2.0]						)]						)
       with self.assertRaises(UpperCamelCase__						):
           accumulator([tf.constant([1.0, 1.0]						), tf.constant([2.0, 2.0]						)]						)
       self.assertEqual(accumulator.step						,     3						)
       self.assertEqual(len(accumulator.gradients						)						,     1						)
       self.assertListAlmostEqual(accumulator.gradients[0].numpy().tolist()						,     [-2.0, 5.0]						,     tol=1e-2						)
       accumulator.reset()
       self.assertEqual(accumulator.step						,     0						)
       self.assertListAlmostEqual(accumulator.gradients[0].numpy().tolist()						,     [0.0, 0.0]						,     tol=1e-2						)







   def 			lowerCamelCase		(     self						)     ->		int:

       '''simple docstring'''




       snake_case   :				Optional[Any]				 =   None
       ops.enable_eager_execution_internal()
       snake_case   :				str				 =   tf.config.list_physical_devices("CPU"						)
       if len(UpperCamelCase__						) == 1:
           tf.config.set_logical_device_configuration(
               physical_devices[0]						,     [tf.config.LogicalDeviceConfiguration(), tf.config.LogicalDeviceConfiguration()]						)
       snake_case   :				Optional[int]				 =   tf.config.list_logical_devices(device_type="CPU"						)
       snake_case   :				List[str]				 =   tf.distribute.MirroredStrategy(devices=devices[:2]						)

       with strategy.scope():
           snake_case   :				int				 =   GradientAccumulator()
           snake_case   :				int				 =   tf.Variable([4.0, 3.0]						)
           snake_case ,snake_case   :				Any				 =   create_optimizer(5e-5						,     10						,     5						)
           snake_case   :				Tuple				 =   tf.Variable([0.0, 0.0]						,     trainable=UpperCamelCase__						)

       def accumulate_on_replica(UpperCamelCase__						):
           accumulator([gradient]						)

       def apply_on_replica():
           optimizer.apply_gradients(list(zip(accumulator.gradients						,     [variable]						)						)						)

       @tf.function
       def accumulate(UpperCamelCase__						,     UpperCamelCase__						):
           with strategy.scope():
               snake_case   :				Union[str, Any]				 =   strategy.experimental_local_results(UpperCamelCase__						)
               local_variables[0].assign(UpperCamelCase__						)
               local_variables[1].assign(UpperCamelCase__						)
               strategy.run(UpperCamelCase__						,     args=(gradient_placeholder,)						)

       @tf.function
       def apply_grad():
           with strategy.scope():
               strategy.run(UpperCamelCase__						)

       def _check_local_values(UpperCamelCase__						,     UpperCamelCase__						):
           snake_case   :				List[Any]				 =   strategy.experimental_local_results(accumulator._gradients[0]						)
           self.assertListAlmostEqual(values[0].value()						,     UpperCamelCase__						,     tol=1e-2						)
           self.assertListAlmostEqual(values[1].value()						,     UpperCamelCase__						,     tol=1e-2						)

       accumulate([1.0, 2.0]						,     [-1.0, 1.0]						)
       accumulate([3.0, -1.0]						,     [-1.0, -1.0]						)
       accumulate([-2.0, 2.0]						,     [3.0, -2.0]						)
       self.assertEqual(accumulator.step						,     3						)
       _check_local_values([2.0, 3.0]						,     [1.0, -2.0]						)
       apply_grad()
       self.assertListAlmostEqual(variable.value()						,     [4.0, 3.0]						,     tol=1e-2						)
       accumulator.reset()
       self.assertEqual(accumulator.step						,     0						)
       _check_local_values([0.0, 0.0]						,     [0.0, 0.0]						)





