class_docstr: Main Class to compute the CIDEr metric
class_docstr_tok: ["Main","Class","to","compute","the","CIDEr","metric"]
code: def __init__(self, df, test=None, refs=None, n=4, sigma=6.0):
      # set cider_tool to sum over 1 to 4-grams
      self._n = n
      # set the standard deviation parameter for gaussian penalty
      self._sigma = sigma
      self._dfMode = df
  
imports: from .cider_scorer import CiderScorer
label_desc: Use image node_id 1 to create a new Cider object from inherited base classes: object with example: obj = Cider(df, test, refs, n, sigma)