Storing a frequency distribution in Redis
The nltk.probability.FreqDist class is used in many classes throughout NLTK for storing and managing frequency distributions. It's quite useful, but it's all in-memory, and doesn't provide a way to persist the data. A single FreqDist is also not accessible to multiple processes. We can change all that by building a FreqDist on top of Redis.
Redis is a data structure server that is one of the more popular NoSQL databases. Among other things, it provides a network-accessible database for storing dictionaries (also known as hash maps). Building a FreqDist interface to a Redis hash map will allow us to create a persistent FreqDist that is accessible to multiple local and remote processes at the same time.
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