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问题 This is my scenario. I have 2 Properties. Type and State. Type is an Enum with 3 values eg, ball, car, arrow. State is an int which would accept 3 state values eg., -1, 0, 1. Also, I have 9 images for each state values. Like, if I select type as ball and value as -1, I want to display a Red color ball. If I select type as arrow and value as 1, I want to display a up arrow. etc., I'm able to do this in WPF. I created 3 DataTemplates with an empty Image. Then, I use DataTrigger to check and

问题 I need to compare documents stored in a DB and come up with a similarity score between 0 and 1. The method I need to use has to be very simple. Implementing a vanilla version of n-grams (where it possible to define how many grams to use), along with a simple implementation of tf-idf and Cosine similarity. Is there any program that can do this? Or should I start writing this from scratch? 回答1: Check out NLTK package: http://www.nltk.org it has everything what you need For the cosine_similarity