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: Two men wearing bike helmets. Sentence 2: Two men stand with their bicycles outside a shop.

SOLUTION: 2

PROBLEM: Sentence 1: A man is carrying another man over his shoulder. Sentence 2: A man is carrying someone on his shoulder.

SOLUTION: 3

PROBLEM: Sentence 1: Mitt Romney wins Maryland GOP primary Sentence 2: Romney wins Maryland Republican primary

SOLUTION:
5