code: def roll_left(self):
      for i in range(self.config.num_hidden_layers):
          self.key_states[i] = torch.roll(
              self.key_states[i], shifts=-1, dims=2
          )
          self.value_states[i] = torch.roll(
              self.value_states[i], shifts=-1, dims=2
          )
  
      self.current_seq_len -= 1
  
imports: import sys
  import torch
  from torch import nn
  import torch.nn.functional
  from safetensors import safe_open
  import cuda_ext
  import json
  import math
  import gc
  from enum import Enum
label_desc: Use image node_id 4 for calling the ExLlamaCache obj's underlying member method code with example usage: obj.roll_left() without return types