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: Cleveland Kidnapper Ariel Castro Found Hanged in Prison Cell Sentence 2: Cleveland kidnapper Ariel Castro found hanging in his cell

SOLUTION: 5

PROBLEM: Sentence 1: A group of youngsters swim in lake water Sentence 2: Many children are playing and swimming in the water.

SOLUTION: 4

PROBLEM: Sentence 1: A herd of deer are crossing the street. Sentence 2: A herd of caribou are crossing a road.

SOLUTION:
3