code: 
  
  
  
  from __future__ import annotations
  
  class      UpperCAmelCase_						:
  
  						'''simple docstring'''
  
  
  
  
  						def __init__(					self   ,							_A	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      value
  													__SCREAMING_SNAKE_CASE								=      None
  													__SCREAMING_SNAKE_CASE								=      None
  
  
  
  
  
  
  
  class      UpperCAmelCase_						:
  
  						'''simple docstring'''
  
  
  
  
  						UpperCamelCase__    :				int
  
  
  
  
  
  
  						def __init__(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      0
  
  
  
  
  
  
  						def  _A			(					self   ,							_A   ,							_A	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													if node is None:
  																				return
  
  													if path_sum == self.target:
  																				self.paths += 1
  
  													if node.left:
  																				self.depth_first_search(node.left   ,							path_sum + node.left.value	)
  													if node.right:
  																				self.depth_first_search(node.right   ,							path_sum + node.right.value	)
  
  
  
  
  
  
  						def  _A			(					self   ,							_A   ,							_A = None	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													if node is None:
  																				return 0
  													if target is not None:
  																				__SCREAMING_SNAKE_CASE								=      target
  
  													self.depth_first_search(_A   ,							node.value	)
  													self.path_sum(node.left	)
  													self.path_sum(node.right	)
  
  													return self.paths
  
  
  if __name__ == "__main__":
  			import doctest
  
  			doctest.testmod()
  
  
  
  
  
  
  
style_context: 
  
  
  
  import unittest
  
  from cer import CER
  
  
  lowerCAmelCase__	:  Dict 		=CER()
  
  class      UpperCAmelCase_						(     unittest.TestCase ):
  
  						'''simple docstring'''
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['White House']
  													__SCREAMING_SNAKE_CASE								=      ['white house']
  													# S = 2, D = 0, I = 0, N = 11, CER = 2 / 11
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.1_8_1_8_1_8_1_8_1_8	) < 1e-6	)
  
  
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['were wolf']
  													__SCREAMING_SNAKE_CASE								=      ['werewolf']
  													# S = 0, D = 0, I = 1, N = 9, CER = 1 / 9
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.1_1_1_1_1_1_1	) < 1e-6	)
  
  													__SCREAMING_SNAKE_CASE								=      ['werewolf']
  													__SCREAMING_SNAKE_CASE								=      ['weae     wolf']
  													# S = 1, D = 1, I = 0, N = 8, CER = 0.25
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.2_5	) < 1e-6	)
  
  													# consecutive whitespaces case 1
  													__SCREAMING_SNAKE_CASE								=      ['were wolf']
  													__SCREAMING_SNAKE_CASE								=      ['were               wolf']
  													# S = 0, D = 0, I = 0, N = 9, CER = 0
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.0	) < 1e-6	)
  
  													# consecutive whitespaces case 2
  													__SCREAMING_SNAKE_CASE								=      ['were   wolf']
  													__SCREAMING_SNAKE_CASE								=      ['were               wolf']
  													# S = 0, D = 0, I = 0, N = 9, CER = 0
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.0	) < 1e-6	)
  
  
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['werewolf']
  													__SCREAMING_SNAKE_CASE								=      ['weaewolf']
  													# S = 1, D = 0, I = 0, N = 8, CER = 0.125
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.1_2_5	) < 1e-6	)
  
  
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['werewolf']
  													__SCREAMING_SNAKE_CASE								=      ['wereawolf']
  													# S = 0, D = 1, I = 0, N = 8, CER = 0.125
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.1_2_5	) < 1e-6	)
  
  
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['werewolf']
  													__SCREAMING_SNAKE_CASE								=      ['wereolf']
  													# S = 0, D = 0, I = 1, N = 8, CER = 0.125
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.1_2_5	) < 1e-6	)
  
  
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['werewolf']
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertEqual(_A   ,							0.0	)
  
  
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['werewolf', 'I am your father']
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertEqual(_A   ,							0.0	)
  
  													__SCREAMING_SNAKE_CASE								=      ['werewolf', 'I am your father', 'doge']
  													__SCREAMING_SNAKE_CASE								=      ['werxwolf', 'I       am your father', 'doge']
  													# S = 1, D = 0, I = 0, N = 28, CER = 1 / 28
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.0_3_5_7_1_4_2_8	) < 1e-6	)
  
  
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['My hovercraft', 'is full of eels']
  													__SCREAMING_SNAKE_CASE								=      ['My hovercraft is full', ' of eels']
  													# S = 0, D = 0, I = 2, N = 28, CER = 2 / 28
  													# whitespace at the front of " of eels" will be strip during preporcessing
  													# so need to insert 2 whitespaces
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A   ,							concatenate_texts=_A	)
  													self.assertTrue(abs(char_error_rate - 0.0_7_1_4_2_8	) < 1e-6	)
  
  
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['我能吞下玻璃而不伤身体']
  													__SCREAMING_SNAKE_CASE								=      [' 能吞虾玻璃而 不霜身体啦']
  													# S = 3, D = 2, I = 0, N = 11, CER = 5 / 11
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.4_5_4_5_4_5_4_5_4_5	) < 1e-6	)
  
  													__SCREAMING_SNAKE_CASE								=      ['我能吞下玻璃', '而不伤身体']
  													__SCREAMING_SNAKE_CASE								=      ['我    能 吞 下 玻 璃', '而不伤身体']
  													# S = 0, D = 5, I = 0, N = 11, CER = 5 / 11
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertTrue(abs(char_error_rate - 0.4_5_4_5_4_5_4_5_4_5_4_5	) < 1e-6	)
  
  													__SCREAMING_SNAKE_CASE								=      ['我能吞下玻璃而不伤身体']
  													__SCREAMING_SNAKE_CASE								=      cer.compute(predictions=_A   ,							references=_A	)
  													self.assertFalse(_A   ,							0.0	)
  
  
  
  
  
  
  						def  _A			(					self	):
  
  
  
  
  
  
  
  													'''simple docstring'''
  
  													__SCREAMING_SNAKE_CASE								=      ['']
  													__SCREAMING_SNAKE_CASE								=      ['Hypothesis']
  													with self.assertRaises(_A	):
  																				cer.compute(predictions=_A   ,							references=_A	)
  
  
  if __name__ == "__main__":
  			unittest.main()
  
  
  
  
  
  
  