code: def get_learning_rate(self, iter):
          '''
          Get learning rate with cosine decay based on current iteration.
  
          Args:
              iter (int): Current iteration (starting with 0).
  
          Returns:
              float: Learning rate
          '''
          return self.init_lr * ((math.cos(iter * 1.0 / (self.max_iter) * math.pi) + 1.0) * 0.5f get_learning_rate(self, iter):
          '''
          Get learning rate with cosine decay based on current iteration.
  
          Args:
              iter (int): Current iteration (starting with 0).
  
          Returns:
              float: Learning rate
          '''
          return self.init_lr * ((math.cos(iter * 1.0 / (self.max_iter) * math.pi) + 1.0) * 0.5)
docs: Get learning rate with cosine decay based on current iteration.
  
          Args:
              iter (int): Current iteration (starting with 0).
  
          Returns:
              float: Learning rate