docstr: Gets the graph file name.
docstr_tok: ["Gets","the","graph","file","name","."]
code: def getGraphFile(self):
      """Gets the graph file name."""
      return self.getOrDefault(self.graphFile)
  
imports: from pyspark.ml import Model, Estimator
  from pyspark.ml.util import DefaultParamsWritable, DefaultParamsReadable
  from sparknlp.common import *
label_desc: Use image node_id 11 for calling the TFNerDLGraphBuilder obj's underlying member method code with example usage: obj.getGraphFile() and returns: self