title: nd4j backend RuntimeException on android
body: <p>I get the following RuntimeException:</p>
  
  <pre><code>java.lang.RuntimeException: org.nd4j.linalg.factory.Nd4jBackend$NoAvailableBackendException: Please ensure that you have an nd4j backend on your classpath. Please see: http://nd4j.org/getstarted.html
  </code></pre>
  
  <p>it seems to me that i am missing an nd4j backend i here is my gradel file dependencies:</p>
  
  <pre><code>dependencies {
     compile group: 'org.nd4j', name: 'nd4j-context', version: '0.7.1'
     compile('org.deeplearning4j:deeplearning4j-nn:0.7.1')
  }
  </code></pre>
  
  <p>tryed using nd4j-native and bunch of other but didn't help.</p>
  
  <p>Have no idea what more to do.</p>