The evaluation metric to use. One of fuzzy_match, bleu, gleu, meteor,
rouge_1, rouge_2, rouge_3, rouge_4, rouge_5, or rouge_l.
The text being graded.
The name of the grader.
The threshold for the score.
The text being graded against.
The type of grader.
A TextSimilarityGrader object which grades text based on similarity metrics.