title: Algorithms for named entity recognition
body: <p>I would like to use named entity recognition (NER) to find adequate tags for texts in a database.</p>
  
  <p>I know there is a Wikipedia article about this and lots of other pages describing NER, I would preferably hear something about this topic from you:</p>
  
  <ul>
  <li>What experiences did you make with the various algorithms?</li>
  <li>Which algorithm would you recommend?</li>
  <li>Which algorithm is the easiest to implement (PHP/Python)?</li>
  <li>How to the algorithms work? Is manual training necessary?</li>
  </ul>
  
  <p>Example:</p>
  
  <p>"Last year, I was in London where I saw Barack Obama." => Tags: London, Barack Obama</p>
  
  <p>I hope you can help me. Thank you very much in advance!</p>