Table 5
Combined experiments: BLEU. The subscript indicates the parameters found on IN2EN-dev and used for IN2EN-test. The absolute test improvement over the corresponding baseline (on top of each column) is in superscript. The scores that are statistically significantly better than ML2EN (p < 0.01, Collins' sign test) are shown in bold. The last line shows system combination results using MEMT.
| Combination with | Combining IN2EN with an adapted version of ML2EN | |||
|---|---|---|---|---|
| Simple Concatenation | Balanced Concatenation | Sophisticated Combination | ||
| (i) | + ML2EN (unadapted; baseline) | 18.49 | 19.79 | 20.10(.5.5) |
| (ii) | + CN:word |  |  |  |
| + CN:word′ |  |  |  | |
| + CN:word′+morph |  |  |  | |
| (iii) | + PPT:phrase1 |  |  |  |
| + PPT:phrase4 |  |  |  | |
| + PPT:phrase4::CN:morph |  |  |  | |
| (iv) | + DD:word′ |  |  |  |
| + DD:word′+morph |  |  |  | |
| + DD:phrase4 |  |  |  | |
| + DD:phrase4+morph |  |  |  | |
| System combination: (i)+(ii)+(iii)+(iv) | 21.74(+3.25) | 21.81(+2.02) | 22.03(+1:93) | |
| Combination with | Combining IN2EN with an adapted version of ML2EN | |||
|---|---|---|---|---|
| Simple Concatenation | Balanced Concatenation | Sophisticated Combination | ||
| (i) | + ML2EN (unadapted; baseline) | 18.49 | 19.79 | 20.10(.5.5) |
| (ii) | + CN:word | | | |
| + CN:word′ | | | | |
| + CN:word′+morph | | | | |
| (iii) | + PPT:phrase1 | | | |
| + PPT:phrase4 | | | | |
| + PPT:phrase4::CN:morph | | | | |
| (iv) | + DD:word′ | | | |
| + DD:word′+morph | | | | |
| + DD:phrase4 | | | | |
| + DD:phrase4+morph | | | | |
| System combination: (i)+(ii)+(iii)+(iv) | 21.74(+3.25) | 21.81(+2.02) | 22.03(+1:93) | |