class_docstr: emotion keras solver 
class_docstr_tok: ["emotion","keras","solver"]
docstr: get input data 
docstr_tok: ["get","input","data"]
code: def input_data(self, mode):
      """get input data"""
      _, task = self.input_fn(mode)
      assert self.task
      return None, task
  
imports: import librosa
  from absl import logging
  import delta.compat
  from tensorflow.keras import backend
  from tensorflow.python.keras.utils import losses_utils
  from delta import utils
  from delta.utils.solver.estimator_solver import EstimatorSolver
  from delta.utils.solver.utils.callbacks import ClassReportCallBack
  from delta.utils.solver.asr_solver import AsrSolver
  from delta.utils.register import registers
label_desc: Use image node_id 4 for calling the EmoKerasSolver obj's underlying member method code with example usage: obj.input_data(mode) and returns: None,  task