code: def __init__(self, parameter_size, stepsize, momentum=0.9):
      Optimizer.__init__(self, parameter_size)
      self.v = np.zeros(self.dim, dtype=np.float32)
      self.stepsize, self.momentum = stepsize, momentum
  
file_path: PARL/benchmark/fluid/ES/optimizers.py
imports: import numpy
label_desc: Use image node_id 1 to create a new SGD object from inherited base classes: Optimizer with example: obj = SGD(parameter_size, stepsize, momentum)