code: def _create_examples(cls, lines, set_type):
      examples = []
  
      for i, (ex, label_string) in enumerate(lines):
          examples.append(
              Example(
                  guid="%s-%s" % (set_type, i),
                  prompt=ex["goal"],
                  choice_list=[ex["sol1"], ex["sol2"]],
                  label=int(label_string)
                  if set_type != "test"
                  else cls.CHOICE_KEYS[-1],
              )
          )
  
      return examples
  
file_path: jiant/jiant/tasks/lib/piqa.py
imports: from dataclasses import dataclass
  from jiant.tasks.lib.templates.shared import labels_to_bimap
  from jiant.tasks.lib.templates import multiple_choice
  from jiant.utils.python.io import read_json_lines, read_file_lines
label_desc: Use image node_id 4 for calling the PiqaTask obj's underlying member method code with example usage: obj._create_examples(cls, lines, set_type) and returns: examples