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: A dog is running through a backyard full of leaves. Sentence 2: Three dogs run through a field.

SOLUTION: 3

PROBLEM: Sentence 1: Two die in Syria violence after UN monitors land Sentence 2: Two year doping ban for Contador

SOLUTION: 0

PROBLEM: Sentence 1: A rat like creature is smelling around. Sentence 2: An animal is walking on the ground.

SOLUTION:
2