code: def __init__(self, features, corpus):
      self.features = features
      self.corpus = corpus
  
imports: import pycrfsuite
  import logging
  from underthesea_core import CRFFeaturizer
  from underthesea.transformer.tagged_feature import lower_words
label_desc: Use image node_id 1 to create a new Trainer object  with example: obj = Trainer(features, corpus)