Information Retrieval: Term-Document Matrix

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What is the main idea behind the Bag-of-Words model?

Individual words are not important

Re-ordering destroys the topic

Documents are represented as graphs

Re-ordering doesn't destroy the topic (correct)

What is the simplest IR system?

grep-like system (correct)

Vector Space Model

Okapi BM25

Boolean Retrieval Model

What are the three basic operators used in Boolean Retrieval Model?

AND, NAND, NOR

AND, OR, NOT (correct)

AND, OR, XOR

NOT, XOR, NAND

What is the major limitation of the simplest IR system?

It is very inefficient Signup and view all the answers

How does the Bag-of-Words model treat documents and queries?

As bags of words Signup and view all the answers

What is the primary goal of an Information Retrieval system?

To retrieve relevant documents Signup and view all the answers

What is the information need in the context of Information Retrieval?

A topic about which the user desires to know more Signup and view all the answers

What is the main difference between a database and an Information Retrieval system?

The structure of the data Signup and view all the answers

What is relevance in the context of Information Retrieval?

A document's relevance to the information need Signup and view all the answers

What is a challenge in determining relevance in Information Retrieval?

The ambiguity of natural language Signup and view all the answers

What is the main goal of Information Retrieval?

To find material that satisfies an information need Signup and view all the answers

What is the relationship between Information Retrieval and Natural Language Processing?

IR makes NLP useful Signup and view all the answers

Why is interaction with the system important in Information Retrieval?

Because it enables the user to refine their search query Signup and view all the answers

What is the characteristic of a search query in Information Retrieval?

It is a one-shot query Signup and view all the answers

What does a Term-Document Incidence Matrix show?

both the terms that appear in a document and the documents that have a particular term Signup and view all the answers

What is the main characteristic of Boolean Retrieval?

It returns a set of documents that exactly satisfy the query Signup and view all the answers

What is the purpose of building a Term-Document Incidence Matrix?

To identify the terms and documents in a collection Signup and view all the answers

What is a characteristic of Boolean Expression in Boolean Retrieval?

It is used to exactly match the query Signup and view all the answers

How does Boolean Retrieval divide the collection?

Into retrieved and not-retrieved documents Signup and view all the answers

What is the limitation of Boolean Retrieval?

It does not rank documents based on relevance Signup and view all the answers

What is the main difference between a Database and Information Retrieval system?

A Database is used for exact matching, while Information Retrieval is used for relevance matching Signup and view all the answers

What is the main advantage of Boolean Retrieval?

It is still used in many search systems Signup and view all the answers