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Introduction to Document Similarity with Elasticsearch. But, if you’re brand brand brand new towards the notion of document similarity, right here’s a quick overview.

In a text analytics context, document similarity relies on reimagining texts as points in area that may be near (comparable) or various (far apart). Nevertheless, it is not necessarily a simple procedure to figure out which document features must certanly be encoded in to a similarity measure (words/phrases? document length/structure?). Furthermore, in training it may be difficult to find a fast, efficient means of finding comparable papers offered some input document. In this post I’ll explore some of the similarity tools applied in Elasticsearch, which could allow us to enhance search rate and never having to sacrifice a lot of when you look at the real method of nuance.

Document Distance and Similarity

In this post I’ll be concentrating mostly on getting started off with Elasticsearch and comparing the built-in similarity measures currently implemented in ES.

Basically, to express the exact distance between papers, we are in need of a couple of things:

first, a real method of encoding text as vectors, and 2nd, a means of calculating distance.

  1. The bag-of-words (BOW) model enables us to express document similarity pertaining to language and it is an easy task to do. Some typical choices for BOW encoding consist of one-hot encoding, regularity encoding, TF-IDF, and distributed representations.
  2. Just How should we determine distance between papers in area? Euclidean distance is actually where we begin, it is not necessarily the best option for text. Papers encoded as vectors are sparse; each vector might be so long as the sheer number of unique terms over the complete corpus. Continue reading