ESTIMATION APPARATUS, LEARNING APPARATUS, ESTIMATION METHOD, LEARNING METHOD, AND PROGRAM

1 . An estimation system comprising:

a processor; and

a memory storing therein a set of instructions which, when executed by the processor, cause the estimation system to:

receive, as inputs:

an extended word alignment estimated between a source sentence and a translated sentence of the source sentence, the extended word alignment referring to a function to show, per word, whether or not the translated sentence is a correct translation of the source sentence, and also referring to a correctly or incorrectly translated or aligned word pair; and

translation quality tags with which the source sentence and the translated sentence are labeled per word; and

estimate an edit tag based on the extended word alignment and the translation quality tags.

2 . The estimation system according to claim 1 , wherein the processor further causes the estimation system to estimate the extended word alignment between the source sentence and the translated sentence based on a pre-trained extended word alignment model.

3 . The estimation system according to claim 1 , wherein the processor further causes the estimation system to estimate at least one of the following tags as the edit tag based on the extended word alignment and the translation quality tags:

a replace tag that indicates that a word in the translated sentence needs to be replaced with a correct translation of a word in the source sentence;

an insert tag that indicates that a translation of a word in the source sentence needs to be inserted in the translated sentence; or

a delete tag that indicates that a word needs to be deleted from the translated sentence

4 . (canceled)

5 . A computer-implemented estimation method comprising:

receiving, as inputs:

an extended word alignment estimated between a source sentence and a translated sentence of the source sentence, the extended word alignment referring to a function to show, per word, whether or not the translated sentence is a correct translation of the source sentence, and also referring to a correctly or incorrectly translated or aligned word pair; and

translation quality tags, with which the source sentence and the translated sentence are labeled per word; and

estimating an edit tag based on the extended word alignment and the translation quality tags.

6 . (canceled)

7 . A computer-readable non-transitory recording medium storing therein a program that, when executed by a computer, causes the computer to perform the method of claim 5 .

8 . (canceled)