class_docstr: Do NOT use this directly, use its children.
class_docstr_tok: ["Do","NOT","use","this","directly",",","use","its","children","."]
code: def get_num_samples(self, opt):
      dt = get_dtype(opt)
      return NUM_SAMPLES[self._teacher_type()][dt]
  
imports: import os
  import json
  from copy import deepcopy
  from parlai.core.message import Message
  from parlai.utils.data import DatatypeHelper
  from parlai.core.teachers import ChunkTeacher
  from .build import build
label_desc: Use image node_id 4 for calling the BaseBB3DataTeacher obj's underlying member method code with example usage: obj.get_num_samples(opt) and returns: NUM_SAMPLES