code: def read_examples(input_file):
      
      examples = []
      unique_id = 0
      with open(input_file, "r", encoding='utf-8') as reader:
          while True:
              line = reader.readline()
              if not line:
                  break
              line = line.strip()
              text_a = None
              text_b = None
              m = re.match(r"^(.*) \|\|\| (.*)$", line)
              if m is None:
                  text_a = line
              else:
                  text_a = m.group(1)
                  text_b = m.group(2)
              examples.append(
                  InputExample(unique_id=unique_id, text_a=text_a, text_b=text_b))
              unique_id += 1
      return examples
docs: Read a list of `InputExample`s from an input file.