title: output "get no rate" from grid.py of libsvm
body: <p>I have downloaded libsvm-3.17 package. Extracted the files. I go to 'tools' folder to try using grid.py to look for suitable c and g with the dataset provided in the package, i.e. heart_scale.
  However, the following is what I get </p>
  
  <p>Traceback (most recent call last):
    File "C:...\Documents\libsvm-3.17\tools\grid.py", line 266, in run
      if rate is None: raise RuntimeError('get no rate')
  RuntimeError: get no rate
  worker local quit.</p>
  
  <p>Can someone help me figure out how to solve this problem.
  Thank you very much.</p>