code: def __len__(self):
      return len(self.ds) // self.batch
  
file_path: tensorpack/examples/CTC-TIMIT/timitdata.py
imports: import numpy
  from tensorpack import ProxyDataFlow
label_desc: Use image node_id 2 for calling the TIMITBatch obj's underlying member method code with example usage: obj.__len__() and returns: unknown