title: How can i run a model trained on GPU in spacy
body: <p>Title.I use spacy2.2.3 to train a new model,so i code that in cmd in windows7：</p>
  
  <pre><code>python -m spacy train -g -1 zh models train_path dev_path
  </code></pre>
  
  <p>Also,i install cupy-cuda101,version 7.2.0. When coding in python3.7.6:</p>
  
  <pre><code>import spacy
  spacy.prefer_gpu()
  spacy.require_gpu()
  </code></pre>
  
  <p>They both print "True".</p>
  
  <p>I use '-g -1' because i want to train it on gpu,and i learnt this by help option.
  And then,i opened taskmgr as well as GPU-Z,the result told me it still run on cpu instead of gpu.</p>
  
  <p>What cause it?I am pretty new in this. Who can help me?</p>
  
  <p>System:Windows 7</p>
  
  <p>GPU :GT740</p>