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.

Example Input: Sentence 1: A man is hugging someone. Sentence 2: A man is taking a picture.
Example Output: 0

Example Input: Sentence 1: Obama nominates new transportation secretary Sentence 2: Obama To Meet Embattled Veterans Secretary
Example Output: 0

Example Input: Sentence 1: A man is walking on a rope. Sentence 2: A man is riding a mo-pad.
Example Output:
0