class_docstr: Time context manager for code block
      with timer():
          do something
      timer.get()
class_docstr_tok: ["Time","context","manager","for","code","block","with","timer","(",")",":","do","something","timer.get","(",")"]
code: def zero(select_keys=None):
      if select_keys is None:
          for key, value in timer.NAMED_TAPE.items():
              timer.NAMED_TAPE[key] = 0
      else:
          for key in select_keys:
              timer.NAMED_TAPE[key] = 0
  
imports: import paddle
  from paddle import nn, optimizer
  import numpy
  from paddle import log
  from dataloader import BasicDataset
  from paddle.io import Dataset
  from time import time
  from sklearn.metrics import roc_auc_score
  import random
  import os
  from tqdm import tqdm
label_desc: Use image node_id 3 for calling the timer obj's underlying member method code with example usage: obj.zero(select_keys) without return types