title: google sparse hash with murmur hash function
body: <p>How to use murmur hash function in google sparse hash map?
  Could you please give me step by step instructions on how to use murmur hash function?
  I'm using visual c++.</p>
  
  <p>Currently I'm using std::hash hash function in google sparse hash map. 
  Is there any performance difference  between the goole sparse hash maps which are implemented using std::hash and murmur hash?</p>