As shown in Figure 3 we present the users with 3 variants of the same sentence: one produced by a template-based generator (referred as template in Table 5), one produced by the NLG statistical model (presented in Section 5.)
as for paraphrases, a variety of approaches have been tested including extracting paraphrases from multiple translations of the same source text (Barzilay and McKeown, 2001) (parallel corpus approach), using monolingual comparable corpora (Wang and Callison-Burch, 2011), aligning several dictionary definitions of the same term to extract paraphrases (Murata et al., 2005), etc.