title: class cv::ml::SVM do not have member called Params
body: <p>I was learning opencv3 official SVM example, encountered this problem.
  Here is the code.</p>
  
  <pre><code>    #include &lt;opencv2/core.hpp&gt;
      #include &lt;opencv2/imgproc.hpp&gt;
      #include "opencv2/imgcodecs.hpp"
      #include &lt;opencv2/highgui.hpp&gt;
      #include &lt;opencv2/ml.hpp&gt;
  
      using namespace cv;
      using namespace cv::ml;
  
      ...[code]
          // Set up SVM's parameters
          ml::SVM::Params params;
          params.svmType = SVM::C_SVC;
          params.kernelType = SVM::LINEAR;
          params.termCrit = TermCriteria(TermCriteria::MAX_ITER, 100, 1e-6);
      ...[code]
  
  }
  </code></pre>
  
  <p>It suggests the following error:
  <br>
  <strong><em>class cv::ml::SVM do not have member called Params</em></strong></p>
  
  <p>I don't know where is the problem, please help~~</p>