title: Using Spacy to train NER to extract skills from Resume. What is U-entity_name in transition means
body: <p>I am using training spacy NER to extract skills information from resume.But error is </p>
  
  <p>Could not find a transition with the name 'U-SKILL' in the NER model</p>
  
  <p>TRAINING DATA:</p>
  
  <p>[(u"I have 2 years of experience in Python", {"entities": [(30, 35, "SKILL")]})]</p>
  
  <p>CODE :</p>
  
  <pre><code>other_pipes = [pipe for pipe in nlp.pipe_names if pipe != "ner"]
  with nlp.disable_pipes(*other_pipes):
      optimizer = nlp.begin_training()
      for i in range(10):
           random.shuffle(train_data)
           for text, annotations in train_data:
               nlp.update([text], [annotations], sgd=optimizer)```
  
  Error Traceback:
  ```Traceback (most recent call last):
  
    File "&lt;ipython-input-1-b5f869eaaf43&gt;", line 1, in &lt;module&gt;
      runfile('/home/abhishek/Desktop/Monster/Resume_Parser/MI_Resume/skills_ner.py', wdir='/home/abhishek/Desktop/Monster/Resume_Parser/MI_Resume')
  
    File "/usr/lib/python3/dist-packages/spyder/utils/site/sitecustomize.py", line 705, in runfile
      execfile(filename, namespace)
  
    File "/usr/lib/python3/dist-packages/spyder/utils/site/sitecustomize.py", line 102, in execfile
      exec(compile(f.read(), filename, 'exec'), namespace)
  
    File "/home/abhishek/Desktop/Monster/Resume_Parser/MI_Resume/skills_ner.py", line 234, in &lt;module&gt;
      nlp.update([text], [annotations], sgd=optimizer)
  
    File "/home/abhishek/.local/lib/python3.6/site-packages/spacy/language.py", line 452, in update
      proc.update(docs, golds, sgd=get_grads, losses=losses, **kwargs)
  
    File "nn_parser.pyx", line 413, in spacy.syntax.nn_parser.Parser.update
  
    File "nn_parser.pyx", line 516, in spacy.syntax.nn_parser.Parser._init_gold_batch
  
    File "ner.pyx", line 106, in spacy.syntax.ner.BiluoPushDown.preprocess_gold
  
    File "ner.pyx", line 165, in spacy.syntax.ner.BiluoPushDown.lookup_transition
  
  KeyError: "[E022] Could not find a transition with the name 'U-SKILL' in the NER model."```
  </code></pre>