November 18, 2015 NISO Webinar: Text Mining: Digging Deep for Knowledge
Text Mining Webinar
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Transcript of Text Mining Webinar
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Text Mining Webinar
The Textprocessing Extension
Rosaria Silipo and Kilian Thiel
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KNIME Text Mining Webinar 2
Agenda
• Text Mining Goals and Usage
• Enrichment & Preprocessing
• Data Types & Structures
• Visualization
• Topic Detection
• Sentiment Analysis
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KNIME Text Mining Webinar 3
Install TextProcessing Extension
KNIME:
www.knime.org
Install Textprocessing Extension
under KNIME Labs
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Examples
Example Workflows available on the KNIME
public server.
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Filtering,
Stemming, ...
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Text Mining Workflow
Create
New
Document
Enrichment Transformation Preprocessing
Frequencies
Visualization Data Mining
Read or Create a
new Document
Add Tags (POS, Sentiment,
cities, domain
specific terms, ...)
Bow
TF abs, TF rel, ,
IDF, ...
Classification for
Topic Detection
Tag Cloud and Document
Properties Visualization
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1 - Create a Document
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Document
Encapsulates text, author,
title, source, category,
and type
New Data Types
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From a Folder
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The output is
a list of
Documents
?
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From PUBMED
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The output is a
list of Documents
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Destination
Folder MUST be
EMPTY!
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Strings to Document
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From RSS Feeds
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http://feeds.nytimes.com/nyt/rss/World Palladian Nodes
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Reviews of Restaurants in Berlin from
TripAdvisor
Self-downloaded with RSS Feeder
The Data Set
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2 - Enrichment
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Document
Encapsulates text, author,
title, source, category,
and type
Term
Encapsulates a term
New Data Types
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Enrichment (Tagging)
Enrichment nodes (mostly) change the
granularity of terms.
– Multiword detection, named entity recognition,
part of speech definition, …
– To each detected entity (term) a tag is added,
specifying its type.
– To avoid intersection of granularity the last
node dominates.
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In case of intersections of granularity the last node overwrites.
Example: “The gene interleukin 6 interacts ....”
1.POS tagger: “The\DT gene\NN interleukin\NN 6\CD interacts \VBZ ”
2.NE tagger: “The\DT gene\NN interleukin 6\GENE interacts \VBZ ”
Tagger Conflict Resolution
POS
Tagger
NE
Tagger
Adds POS tags to
terms.
Adds NE tags to terms and overrides other
conflicting tags.
Overwrite!
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Tagging
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No settingsLanguage +
POS Model
No settings
Abner Model
Named Entity
Dictionary Column
Tag Type
Tag Value
Named Entity
Tags can be set
as unmodifiable
Dictionary Column
Tag Type
Tag Value
Matching StrategyKNIME Copyright 2013 KNIME Text Mining Webinar
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Unmodifiable Named Entity Tags
Named Entities Tags attached
through enrichment nodes can
be set as unmodifiable
Unmodifiable Tags are not
affected by any preprocessing
nodes (stemming, filtering,
etc.)
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Workflow
Strings to Document Workflow + POS Tagger
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3 - Transformation
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Data Types and Features
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• Sentence
• Term
• Molecule Structure
• Document Vector
• String
• Document
• Tags
• Meta Info
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Parsing / Tokenization
Parser nodes parse documents by applying
standard tokenization via OpenNLP
tokenizer.
Each token is a term consisting of a single
word.
Tags are applied to terms.
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Parsing
Annotations label a
section part in the
document (like
“Abstract”, “Title”,
etc.)
Terms consist of
tokens and tags
Document
Sections:
Paragraphs:
Sentences:
Terms:
Token:
Tags:
se1 se2
p1 p2
s1 s2 s3
Abstract
Title
te1 te2 te3 te4 te5
to1 to2 tokens tokens tokens
ta1 tags tags tags tagsta2
to3
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The Bag of Words
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List (Bag) of Terms (Words)
identified in Document
Each Term is
extracted with
Tags (NN, VB, …)
No Settings
required
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Data and Sentence Extractor
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Conversions
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Molecular
Structure
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Workflow
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4 - Preprocessing
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Normal– Faster
– Preprocesses only terms of the term column
– Documents are not changed
Deep– Slower
– Preprocesses terms of the term column
– Terms in documents are changed as well
– Unchanged documents can be appended
Preprocessing Mode
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Filtering by Tags and Terms
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biomedical named entity tags
Any tags
numbers, words <N chars,
modifiable terms
POS, chemical, and pharma tags
French Treebank (POS) tags
Stop word terms
RegEx terms
STTS tags
Remove Punctuation from document
Standard Named Entity Filter tags
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Converting and Replacing
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Groups rows by term value
Term case conversion
RegEx based term replacer
Term replacement with dictionary word
Introducing Hyphenation
(Liang’s algorithm)
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Stemming
• Kuhlen Stemmer (English only)
• Porter (English only)
• Snowball (English, German, French, ...)
Stemmed term replaces original term!
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convert
convertingconvert[]
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Workflow
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5 - Frequencies
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Frequency Measures
• TF
• TF absolute = # occurr. of term t
• TF relative = # occurr. of term t/ # terms
• IDF = log(1 + # docs / # docs with term t)
• ICF = log(1 + # cat./ # cat. with term t)
• IDF * TF36KNIME Copyright 2013 KNIME Text Mining Webinar
Term Frequency
Inverse Document Frequency
Inverse Category Frequency
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Frequency Filter
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Frequency Column
Top K Rows
K
Min max
thresholds
Values between
min threshold and
max threshold
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Workflow
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6 - Visualization
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Document Viewer
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Double-click
opens the
documentSearch engines listed in KNIME->Textprecessing-
>Search Engine Preferences
Right-click word list
search engines
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Document Viewer
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Previous and
next document
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Tag Cloud
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Adj, verbs and nouns
as same word
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Asian Restaurants
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German Food Restaurants
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Fast Food Restaurants
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Hiliting in Tag Clouds
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vietnamis
Interactive
Table
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Workflow
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7 - Topic Classification
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Document Vector
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Bitvector or
frequency
measureDocument Vector: Documents
represented in the terms space
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Term Vector
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Term Vector: Terms represented
in the documents space
Bitvector or
frequency
measure
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Topic Detection Goal
Possible Topics:
- Asian Restaurants
- German Food
- Fast Food
Pre-labeled data set available!
Target Topic is in Document Category.
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Topic Detection
After the Document Vector Transformation,
topic detection becomes just another data
analytics problem.
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80% for training set, 20% for test set.
Target = Category
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Classification Sub-Workflow
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Prepare input
data as word in
Document 1/0
Extract
Category
Training/
Testing
X-Validation
Wrong docs
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Problem 1
Sometimes a pre-labeled data set is not
available.
1. Use a Clustering technique
2. Find a similar pre-labeled data sets that
you can adapt to the current problem
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Problem 2
The vector generated by the Document
Vector node can be high dimensional.
To reduce the input space dimensionality you
can:
- Filter words by frequency
- Detect keywords and only use the most
important ones.
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Keywords Extractor Nodes
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From: "KeyGraph: Automatic Indexing by Co-occurrence Graph based on Building Construction Metaphor" by Yukio Ohsawa.
From:"Keyword extraction from a single document using word co-occurrence statistical information" by Y.Matsuo and M. Ishizuka.
Max. # keywords
per doc
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8 - Sentiment Analysis
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Sentiment Corpus
• MPQA Corpus
with negative
and positive
words
• Tag Words
according to
Corpus with a
Dictionary
Tagger Node
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Dictionary Tagger Node
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List of Words
from Corpus
Tag Value to attach to
Words in document
and in Corpus List
Tag Type to attach to
Words in document
and in Corpus List
Each Tag Type has a
list of possible Tag
Values
NE = Named Entities
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Sentiment By Document
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PERSON Tag for
POSITIVE Words
TIME Tag for
NEGATIVE Words
ATTITUDE = +/-1 for
POSITIVE or
NEGATIVE Words
MEAN(ATTITUDE)
on all words for
each document
Bin1 = negative documents
Bin2, Bin3 = neutral documents
Bin4 = positive documentsAdjust Bin boundaries in
Auto-Binner node for more
accurate results
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Sentiment by Category
• Tag Cloud on all words in all documents for
a given category
• Words in tag clouds are colored by
sentiment
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New column NE
with values:
PERSON, TIME,
neutral (when
missing value)
Color by
NE valueAsian
Fast
Food
German
Cuisine
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Tag Cloud by Category
Asian Fast Food German
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Sentiment by Word
• Find Most Positive/Most Negative
Document
• Build Tag Cloud with words colored by
sentiment
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Sorting
Ascending
Sorting
Descending
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Tag Cloud of Worst/Best Doc
Most Positive Most Negative
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Improvements
• Add polarity change for negations
• Add polarity changes for enhancements
• Improve positive/negative dictionary
• Improve bin distribution (skeweness
towards positive)
• Improve list of stop words
• Remove Names of Burgers?
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Thank you
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