default.nix

let
  pkgs = import <nixpkgs> {};
  stdenv = pkgs.stdenv;
in with pkgs; {
  myProject = stdenv.mkDerivation {
    name = "myProject";
    version = "1";
    src = if pkgs.lib.inNixShell then null else nix;

    buildInputs = with rPackages; [
      R
      ggplot2
      knitr
      textrank
      udpipe
    ];
  };
}

scratch.R

library(textrank)
library(udpipe)

joboffer$textrank_id <- unique_identifier(joboffer, c("doc_id", "paragraph_id", "sentence_id"))
sentences <- unique(joboffer[, c("textrank_id", "sentence")])

terminology <- subset(joboffer, upos %in% c("NOUN", "ADJ"))
terminology <- terminology[, c("textrank_id", "lemma")]

tr <- textrank_sentences(data = sentences, terminology = terminology)


summary(tr, n = 5, keep.sentence.order = TRUE)

https://cran.r-project.org/web/packages/textrank/vignettes/textrank.html