class_docstr: An abstract class for a dataset.
class_docstr_tok: ["An","abstract","class","for","a","dataset","."]
code: def _generate_data(self):
      raise NotImplementedError
  
imports: import numpy
  import os.path
label_desc: Use image node_id 2 for calling the Dataset obj's underlying member method code with example usage: obj._generate_data() without return types