The python gensim.corpora.Dictionary is a class provided by the Gensim library that represents a collection of indexed documents. It is used to create a mapping between words in the documents and their unique numerical identifiers. This dictionary can then be used to convert the text data into a bag-of-words representation, where each document is represented as a sparse vector of word frequencies. The Dictionary class also provides various methods for filtering and manipulating the dictionary, such as removing infrequent or very common words, merging dictionaries, and so on. Overall, the Dictionary class in Gensim is an essential tool for preprocessing text data and preparing it for further analysis, such as topic modeling or document similarity comparisons.
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