Free module
Information retrieval and search
Learn information retrieval hands on: inverted indexes, TF-IDF, cosine ranking, precision and recall, text processing and link-based ranking.
The lessons
Each lesson is free to read in full. Create a free account to run its commands in a live lab and to sit its quizzes and tasks.
1 · Container lab
How an inverted index works
I can find documents for a word with an inverted index.
Read the lesson2 · Container lab
TF-IDF: scoring how special a word is
I can rank documents by how special a word is in them.
Read the lesson3 · Container lab
The vector space model and cosine ranking
I can rank documents by the angle between vectors.
Read the lesson4 · Container lab
Precision and recall for search
I can judge a search with precision and recall.
Read the lesson5 · Container lab
Text processing for search
I can turn raw text into good tokens.
Read the lesson6 · Container lab
Link-based ranking of web pages
I can explain how links can rank pages.
Read the lesson
Worked in a real lab
Every lesson of this module is worked in a lab started for you alone. The labs it uses:
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