class_docstr: abstract class
class_docstr_tok: ["abstract","class"]
docstr: return `def _input_fn()` function
docstr_tok: ["return","`","def","_input_fn","(",")","`","function"]
code: def input_fn(self):
      """return `def _input_fn()` function"""
      return NotImplementedError()
  
file_path: delta/delta/data/task/base_task.py
imports: import abc
label_desc: Use image node_id 7 for calling the Task obj's underlying member method code with example usage: obj.input_fn() and returns: NotImplementedError