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 puppy played with a blue tennis ball. Sentence 2: A puppy is playing with a tennis ball.

SOLUTION: 4

PROBLEM: Sentence 1: A man drove his car. Sentence 2: A man is driving a car.

SOLUTION: 4

PROBLEM: Sentence 1: cambodia and vietnam finalized an agreement to stop asian and european drug traffickers. Sentence 2: syrian and russian officials signed an agreement of cooperation in combating drug trafficking.

SOLUTION:
2