TASK DEFINITION: Evaluate the similarity between them and classify them into classes from 0-5 as follows:
0 : The two sentences are completely dissimilar.
1 : The two sentences are not equivalent, but are on the same topic.
2 : The two sentences are not equivalent, but share some details.
3 : The two sentences are roughly equivalent, but some important information differs/missing.
4 : The two sentences are mostly equivalent, but some unimportant details differ.
5 : The two sentences are completely equivalent, as they mean the same thing.
PROBLEM: Sentence 1: Obama widens lead over Romney despite jobs data: Reuters/Ipsos poll Sentence 2: Romney takes lead over Obama with convention "bounce": Reuters/Ipsos poll

SOLUTION: 1

PROBLEM: Sentence 1: For the year, it expects sales of $94 million and a profit of 26 cents a share from continuing operations. Sentence 2: This is an increase from the $22.5 million and 5 cents a share previously forecast.

SOLUTION: 1

PROBLEM: Sentence 1: georgian government websites are under intense cyber attack following russian military strikes against georgia late last week. Sentence 2: the cyber attacks follow russian military strikes launched against georgia late last week.

SOLUTION:
5