Title: SVC-Scikit Learn issue
This basically means that your testing set is not in the same format as your training set. 
A code snippet would have been great, but make sure you are using the same array format for both sets.
I am getting this error in Scikit learn. Previously I worked with K validation, and never encountered error. My data is sparse and training and testing set is divided in the ratio 90:10
ValueError: cannot use sparse input in 'SVC' trained on dense data
Is there any straightforward reason and solution for this?