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Discrepancy between dialign offline and online #5

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@akonoroshi

Hello, thank you for releasing such an amazing tool!

I have found some shared expressions have different establishment turns between offline and online versions or even are not established in the offline version when a larger expression is established in a later turn. For example, in the following conversation (tokenized),

A: if you cross multiply step zero , so one twentieth by two thirds , you can take that ratio and apply it to step one .
B: i will cross multiply . can you clarify , though , what i should multiply ?
A: you 're going to multiply one over twenty by three over two .
B: so i can multiply two over three by three over two . what do i do next ?
A: you 'll divide to know the ratio that you can apply to see how long it would take to bike thirty miles .
B: so dividing twenty five by two point five gets us ten . ten miles per hour ?

the expression "by" is established in the fourth turn in the online version because it appears in a free form in the first turn. However, it is not established in the offline version because "by two" appears both in the first and last turns. Is this a bug?

Also, probably due to the above reason, the weighted average of DER (i.e., $\frac{\sum_{u \in U} DER_u \dot |u|}{\sum_{u \in U} |u|}$) is not the same as the offline ER.

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