code: def generate(self) -> List[TestInput]:
      for _ in track(range(40)):
          seed = self.seed_selection()
          new_input = self.mutate(seed)
          # print(len(new_input[0]))
          avg, sd = self.test_efficiency(new_input)
          if avg != None and sd != None:
              self.insert_input(TestInput(new_input, avg, sd))
      return self.seed_pool
  
imports: import copy
  import math
  import random
  import string
  from typing import Any, Dict, List, Optional, Set, Tuple
  from multipledispatch import dispatch
  from rich.progress import track
  from evalplus._experimental.evaluate_runtime import MAX_WARMUP_LIMIT, RUN_REPEAT, execute_for_runtime
  from evalplus.gen.mut_gen import MutateGen
label_desc: Use image node_id 39 for calling the TypedMutEffGen obj's underlying member method code with example usage: obj.generate() and returns: self