title: gensim: KeyError: "word 'quick' not in vocabulary"
body: <p>I am running the below code, but gensim word2vec is throwing a word not in vocabulary error. Can you let me know the solution?</p>
  
  <pre><code>import logging
  logging.basicConfig(format='%(asctime)s : %(levelname)s : %(message)s', level=logging.INFO)
  
  sentences = [["The quick brown fox jumped over the lazy dog"], 
           ["The sun is shining bright"]]
  
  from gensim.models import word2vec
  model = word2vec.Word2Vec(sentences, iter=10, min_count=1, size=300, workers=4)
  
  print(model['quick'])
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>KeyError: "word 'quick' not in vocabulary"
  </code></pre>
  
  <p>But If I use this</p>
  
  <pre><code>print(model['The quick brown fox jumped over the lazy dog'])
  </code></pre>
  
  <p>it prints a list</p>
  
  <pre><code>[  1.60348183e-03  -9.17983416e-04  -8.30831763e-04   9.46367683e-04
  </code></pre>