class_docstr: Root Mean Squared Error.
  
  Attributes
  ----------
  name: string, value: 'RMSE'
      Name of the measure.
code: def __init__(self):
      RatingMetric.__init__(self, name="RMSE")
  
file_path: cornac/cornac/metrics/rating.py
imports: import numpy
label_desc: Use image node_id 1 to create a new RMSE object from inherited base classes: RatingMetric with example: obj = RMSE()