title: Python error, cannot import name Imputer on Spark ( Bluemix )
body: <p>I have a problem I wrote my script on spark and when I run the script I have a problem of import but I don't understand why because when I run the same script in local via spyder, I don't get this error.
  so why did I get this error? Is it Bluemix which has a problem?</p>
  
  <p>Script:</p>
  
  <pre><code>from sklearn.ensemble import GradientBoostingClassifier
  from sklearn import preprocessing
  from sklearn.preprocessing import Imputer
  from sklearn.metrics import roc_auc_score
  </code></pre>
  
  <p>and my error is :</p>
  
  <pre><code>&lt;ipython-input-2-13d49864f8d7&gt; in &lt;module&gt;()
       66 from sklearn import preprocessing
       67 #from sklearn.preprocessing import Imputer
  ---&gt; 68 from sklearn.metrics import roc_auc_score
  
  
  ImportError: cannot import name roc_auc_score
  
  or 
  
  from sklearn.ensemble import RandomForestClassifier
        4 import sklearn.preprocessing as p
  ----&gt; 5 from sklearn.preprocessing import Imputer
        6 #import sklearn.metrics as sm
        7 from sklearn.metrics import roc_auc_score
  
  ImportError: cannot import name Impute
  </code></pre>