class_docstr: The CoNLL object holds ten fields required for CoNLL-X data format.
  Each field can be binded with one or more :class:`Field` objects. For example,
  ``FORM`` can contain both :class:`Field` and :class:`SubwordField` to produce tensors for words and subwords.
  
  Attributes:
      ID:
          Token counter, starting at 1.
      FORM:
          Words in the sentence.
      LEMMA:
          Lemmas or stems (depending on the particular treebank) of words, or underscores if not available.
      CPOS:
          Coarse-grained part-of-speech tags, where the tagset depends on the treebank.
      POS:
          Fine-grained part-of-speech tags, where the tagset depends on the treebank.
      FEATS:
          Unordered set of syntactic and/or morphological features (depending on the particular treebank),
          or underscores if not available.
      HEAD:
          Heads of the tokens, which are either values of ID or zeros.
      DEPREL:
          Dependency relations to the HEAD.
      PHEAD:
          Projective heads of tokens, which are either values of ID or zeros, or underscores if not available.
      PDEPREL:
          Dependency relations to the PHEAD, or underscores if not available.
  
  References:
      - Sabine Buchholz and Erwin Marsi. 2006.
        `CoNLL-X Shared Task on Multilingual Dependency Parsing`_.
  
  .. _CoNLL-X Shared Task on Multilingual Dependency Parsing:
      https://www.aclweb.org/anthology/W06-2920/
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code: def tgt(self):
      return self.HEAD, self.DEPREL
  
imports: from collections.abc import Iterable
  import nltk
  from tqdm import tqdm
  from underthesea.utils.sp_parallel import is_master
label_desc: Use image node_id 3 for calling the CoNLL obj's underlying member method code with example usage: obj.tgt() and returns: self,  self