class_docstr: Concatenate one extra sample to the original sample, with maintaining
      the coref-relations themselves.
  
  Attributes:
      processor: textflint.common.preprocess.TextProcessor.
  
  Example::
  
      ori: {
          'sentences': [
              ['I', 'came'], ['I', 'saw'], ['I', 'conquered'], 
              ['Anna', 'bel', 'wanna', 'sleep'],
              ['Anna', 'bel', 'is', 'happy']
              ],
          'clusters': [
              [[1, 1], [3, 3], [5, 5]], 
              [[7, 8], [11, 12]]]}
      trans: {
          'sentences': [
              ['I', 'came'], ['I', 'saw'], ['I', 'conquered'], 
              ['Anna', 'bel', 'wanna', 'sleep'],
              ['Anna', 'bel', 'is', 'happy'],
              ['who', 'is', 'this', 'boy'], ['he', 'is', 'Jotion']],
          'clusters': [
              [[1, 1], [3, 3], [5, 5]], 
              [[7, 8], [11, 12]], 
              [[17, 18], [19, 19], [21, 21]]]}
code: def __init__(self, **kwargs):
      super().__init__()
  
file_path: textflint/textflint/generation/transformation/COREF/random_concat.py
imports: import random
  from ..transformation import Transformation
  from ....input.component.sample import CorefSample
label_desc: Use image node_id 1 to create a new RndConcat object from inherited base classes: Transformation with example: obj = RndConcat()