code: def free(self, block_indices: Optional[List[int]]):
      if block_indices is not None and block_indices:
          # Reset mask
          self.free_block_mask[block_indices] = 1
  
file_path: text-generation-inference/server/text_generation_server/models/cache_manager.py
imports: import math
  import torch
  from typing import Optional, List, Tuple
label_desc: Use image node_id 3 for calling the CacheManager obj's underlying member method code with example usage: obj.free(block_indices) without return types