Therefore, we also present results using a simpler version of our decoder which emulates Chiang's original Hiero implementation (Chiang, 2007).
this means that we don't use dependency-based rule extraction, and our decoder only contains the following MT features: (1) rule probabilities, (2) n-gram Kneser-Ney LM, (3) lexical smoothing, (4) target word count, (5) concat rule penalty.