class_docstr: HFL NN class, users could build custom NN structure in this class
docstr: :param x: data, could be Numpy NdArray or Pandas DataFrame
  :return:
docstr_tok: [":","param","x",":","data",",","could","be","Numpy","NdArray","or","Pandas","DataFrame",":","return",":"]
code: def predict(self, x):
      """
      :param x: data, could be Numpy NdArray or Pandas DataFrame
      :return:
      """
      pass
  
imports: from bigdl.dllib.utils.common import JavaValue
label_desc: Use image node_id 4 for calling the HflNN obj's underlying member method code with example usage: obj.predict(x) without return types