title: FastText: upper case or lower case
body: <p>Using the pre-trained model:</p>
  <pre><code>import fasttext.util
  fasttext.util.download_model('en', if_exists='ignore')  # English
  ft = fasttext.load_model('cc.en.300.bin')
  </code></pre>
  <p>both queries <code>ft['HOME']</code> and <code>ft['home']</code> works, but return different vectors.</p>
  <p>What is the optimal query to make?</p>
  <p>If I'm working with an uppercased corpus, should I transform it into a lowercased?</p>