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: Japan's opposition party chief criticizes Abe's economic policies Sentence 2: Zimbabwe‚Äôs opposition MDC party challenges Robert Mugabe‚Äôs election win

SOLUTION: 0

PROBLEM: Sentence 1: A small dog runs through an obstacle course. Sentence 2: A small dog jumping over an obstacle.

SOLUTION: 4

PROBLEM: Sentence 1: Clinton ready to fight for Obama Sentence 2: Clinton a tough act for Obama to follow

SOLUTION:
1