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ch 7

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1text mining?1- A semi-automated process of extracting knowledge from unstructured data sources
2- a.k.a. text data mining or knowledge discovery in textual databases
2Data Mining versus Text MiningBoth seek for novel and useful patterns
Both are semi-automated processes
Difference is the nature of the data
3Structured versus unstructured dataStructured data: in databases
Unstructured data: Word documents, PDF files, text excerpts, XML files, and so on
4NLP isa very important concept in text mining
a subfield of artificial intelligence and computational linguistics
the studies of "understanding" the natural human language
5Challenges in NLPPart-of-speech tagging
Text segmentation
Word sense disambiguation
Syntax ambiguity
Imperfect or irregular input
Speech acts