addSentenceDetails - Add sentence numbers to documents - MATLAB (original) (raw)
Add sentence numbers to documents
Syntax
Description
Use addSentenceDetails to add sentence information to documents.
The function supports English, Japanese, German, and Korean text.
[updatedDocuments](#d126e4447) = addSentenceDetails([documents](#d126e4154)) detects the sentence boundaries in documents and updates the token details. To get the sentence details fromupdatedDocuments, use tokenDetails.
[updatedDocuments](#d126e4447) = addSentenceDetails([documents](#d126e4154),[Name,Value](#namevaluepairarguments)) specifies additional options using one or more name-value pair arguments.
Tip
Use addSentenceDetails before using thelower, upper,erasePunctuation,normalizeWords, removeWords, and removeStopWords functions asaddSentenceDetails uses information that is removed by these functions.
Examples
Create a tokenized document array.
str = [ ... "This is an example document. It has two sentences." "This document has one sentence." "Here is another example document. It also has two sentences."]; documents = tokenizedDocument(str);
Add sentence details to the documents using addSentenceDetails. This function adds the sentence numbers to the table returned by tokenDetails. View the updated token details of the first few tokens.
documents = addSentenceDetails(documents); tdetails = tokenDetails(documents); head(tdetails)
Token DocumentNumber SentenceNumber LineNumber Type Language
__________ ______________ ______________ __________ ___________ ________
"This" 1 1 1 letters en
"is" 1 1 1 letters en
"an" 1 1 1 letters en
"example" 1 1 1 letters en
"document" 1 1 1 letters en
"." 1 1 1 punctuation en
"It" 1 2 1 letters en
"has" 1 2 1 letters en View the token details of the second sentence of the third document.
idx = tdetails.DocumentNumber == 3 & ... tdetails.SentenceNumber == 2; tdetails(idx,:)
ans=6×6 table Token DocumentNumber SentenceNumber LineNumber Type Language ___________ ______________ ______________ __________ ___________ ________
"It" 3 2 1 letters en
"also" 3 2 1 letters en
"has" 3 2 1 letters en
"two" 3 2 1 letters en
"sentences" 3 2 1 letters en
"." 3 2 1 punctuation en Input Arguments
Name-Value Arguments
Specify optional pairs of arguments asName1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.
Before R2021a, use commas to separate each name and value, and enclose Name in quotes.
Example: 'Abbreviations',["cm" "mm" "in"] specifies to detect sentences boundaries where these abbreviations are followed by a period and a capitalized sentence starter.
List of abbreviations, specified as a string array, character vector, cell array of character vectors, or a table.
If Abbreviations is a string array, character vector, or cell array of character vectors, then the function treats these as regular abbreviations. If the next word is a capitalized sentence starter, then the function breaks at the trailing period. The function ignores any differences in the letter case of the abbreviations. Specify the sentence starters using the Starters name-value pair.
To specify different behaviors when splitting sentences at abbreviations, specify Abbreviations as a table. The table must have variables named Abbreviation and Usage, where Abbreviation contains the abbreviations, and Usage contains the type of each abbreviation. The following table describes the possible values of Usage, and the behavior of the function when passed abbreviations of these types.
| Usage | Behavior | Example Abbreviation | Example Text | Detected Sentences |
|---|---|---|---|---|
| regular | If the next word is a capitalized sentence starter, then break at the trailing period. Otherwise, do not break at the trailing period. | "appt." | "Book an appt. We'll meet then." | "Book an appt.""We'll meet then." |
| "Book an appt. today." | "Book an appt. today." | |||
| inner | Do not break after trailing period. | "Dr." | "Dr. Smith." | "Dr. Smith." |
| reference | If the next token is not a number, then break at a trailing period. If the next token is a number, then do not break at the trailing period. | "fig." | "See fig. 3." | "See fig. 3." |
| "Try a fig. They are nice." | "Try a fig.""They are nice." | |||
| unit | If the previous word is a number and the following word is a capitalized sentence starter, then break at a trailing period. | "in." | "The height is 30 in. The width is 10 in." | "The height is 30 in.""The width is 10 in." |
| If the previous word is a number and the following word is not capitalized, then do not break at a trailing period. | "The item is 10 in. wide." | "The item is 10 in. wide." | ||
| If the previous word is not a number, then break at a trailing period. | "Come in. Sit down." | "Come in.""Sit down." |
The default value is the output of the abbreviations function. For Japanese and Korean text, abbreviations do not usually impact sentence detection.
Tip
By default, the function treats single letter abbreviations, such as "V.", or tokens with mixed single letters and periods, such as "U.S.A." as regular abbreviations. You do not need to include these abbreviations in Abbreviations.
Example: ["cm" "mm" "in"]
Data Types: char | string | table | cell
Words that start a sentence, specified as a string array, character vector, or a cell array of character vectors. If a sentence starter appears capitalized after a regular abbreviation, then the function detects a sentence boundary at the trailing period. The function ignores any differences in the letter case of the sentence starters.
The default value is the output of the stopWords function.
Data Types: char | string | cell
Option to discard previously computed details and recompute them, specified astrue or false.
Data Types: logical
Output Arguments
More About
The addSentenceDetails function detects sentence boundaries based on punctuation characters and line number information. For English and German text, the function also uses a list of abbreviations passed to the function.
For other languages, you might need to specify your own list of abbreviations for sentence detection. To do this, use the 'Abbreviations' option ofaddSentenceDetails.
Algorithms
If emoticons or emoji characters appear after a terminating punctuation character, then the function splits the sentence after the emoticons and emoji.
Version History
Introduced in R2018a