class_docstr: This will preoritically query data from cache-service
class_docstr_tok: ["This","will","preoritically","query","data","from","cache-service"]
code: def __len__(self):
      return self.data_queue.qsize()
  
file_path: singa/examples/model_selection/TRAILS-Database-Native-Model-Selection/internal/ml/model_selection/src/dataset_utils/sequence_dataloader.py
imports: import queue
  import threading
  import requests
  import time
  from src.logger import logger
label_desc: Use image node_id 5 for calling the SquenceDataLoader obj's underlying member method code with example usage: obj.__len__() and returns: self