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: The woman is walking her dog. Sentence 2: A woman walks her dog down the street.

SOLUTION: 4

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: A man dives into a pool. Sentence 2: A man is diving into a pool.

SOLUTION:
5