Table Extraction Using MaxEnt Zonghui Lian. Introduction Table extraction Table format.

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Presentation transcript:

Table Extraction Using MaxEnt Zonghui Lian

Introduction Table extraction Table format

Problem HTML table Tags can help us to understand it How about plain text table?

An Example title separator header datarow

MaxEnt How to define features How to learn model weights

Data Set CS dept university of Massachusetts Amherst (FedStats.gov) Training data: 9321 Test data: 1200 Format

Features White space Large gaps /Small gaps Four space indents Space percentage Text feature Digit percentage Month and year

Features Special characters -, +, =, :, |,.

Result

Error Analysis TABLEFOOTNOTE -> NONTABLE DATAROW DATAROW -> SECTIONDATAROW TABLEHEADER -> SUPERHEADER Most error happened when recognizing … [TABLEFOOTNOTE : DATAROW : TABLEHEADER : TABLEFOOTNOTE1 Includes Hawaii. TABLEFOOTNOTE2 Includes processing total for dual usage crops.

Future Work Improve the performance Features For example Alphabet characters Previous label Next label Data set size

Future Work Identity columns Add tags Use table understanding algorithm