To obtain the corresponding lexical weight, we first estimate a lexical translation probability distribution w(e|f ) by relative frequency from the training corpus: Retaining the alignmentã between the phrase pair (f ,ẽ), the corresponding lexical weight is calculated as However, the above-mentioned method only counts the co-occurrence frequency of bilingual phrases, assuming that the translation probability is independent of the context information.
the statistical model estimated from the training data is not suitable for text translation in different domains, resulting in a significant drop in translation quality.