Teradata Package for R Function Reference | 17.00 - POSTagger - Teradata Package for R - Look here for syntax, methods and examples for the functions included in the Teradata Package for R.

POSTagger

Description

The POSTagger function creates part-of-speech (POS) tags for the words in the input text. POS tagging is the first step in the syntactic analysis of a language, and an important preprocessing step in many natural language processing applications.

Usage

  td_pos_tagger_mle (
      data = NULL,
      text.column = NULL,
      language = "en",
      accumulate = NULL,
      data.sequence.column = NULL,
      data.order.column = NULL
  )

Arguments

data	Required Argument. Specifies the tbl_teradata that contains the input texts to tag.
data.order.column	Optional Argument. Specifies Order By columns for "data". Values to this argument can be provided as a vector, if multiple columns are used for ordering. Types: character OR vector of Strings (character)
text.column	Required Argument. Specifies the name of the input column that contains the text to be tagged. Types: character
language	Optional Argument. Specifies the language of the input text. Permitted Values: en (English), zh_CN (Simplified Chinese) Default Value: "en" Types: character
accumulate	Optional Argument. Specifies the names of the input tbl_teradata columns to copy to the output tbl_teradata. Note: If you intend to use the function output tbl_teradata as input to the function TextChunker (td_textchunker_mle), then this argument must specify the input tbl_teradata columns that comprise the partition key. Types: character OR vector of Strings (character)
data.sequence.column	Optional Argument. Specifies the vector of column(s) that uniquely identifies each row of the input argument "data". The argument is used to ensure deterministic results for functions which produce results that vary from run to run. Types: character OR vector of Strings (character)

Value

Function returns an object of class "td_pos_tagger_mle" which is a named list containing object of class "tbl_teradata".
Named list member can be referenced directly with the "$" operator using name: result.

Examples

  
    # Get the current context/connection
    con <- td_get_context()$connection
    
    # Load example data.
    loadExampleData("pos_tagger_example", "paragraphs_input")
    
    # Create object(s) of class "tbl_teradata".
    paragraphs_input <- tbl(con, "paragraphs_input")
    
    # Example 1 - Applying POSTagger using default language 'en'.
    pos_tagger_out <- td_pos_tagger_mle(data=paragraphs_input,
                                        text.column='paratext',
                                        language='en',
                                        accumulate='paraid'
                                       )
    
    # Example 2 - This example uses output of td_sentence_extractor_mle() function as input.
    td_sentence_extractor_out <- td_sentence_extractor_mle(data = paragraphs_input,
                                                           text.column = "paratext",
                                                           accumulate = c("paraid", "paratopic")
                                                          )
    
    
    pos_tagger_out <- td_pos_tagger_mle(data=td_sentence_extractor_out$result,
                                        text.column='sentence',
                                        accumulate=c('sentence','sentence_sn')
                                       )