class_docstr: The main class for modelTuner
  
  Attributes:
      method: the optimization method. Currently only 'gradient_descent'
              is supported.
      loss:   the optimization loss function. Currently only 'mse' (one-day
              ahead prediction) is supported.
code: def __init__(self, method="gradient_descent", loss="mse"):
      self.method = method
      self.loss = loss
      self.current_mse = None
      self.err = 1e-4
      self.discounts = None
  
file_path: pydlm/pydlm/tuner/dlmTuner.py
imports: from copy import deepcopy
  from numpy import array
  import logging
label_desc: Use image node_id 1 to create a new modelTuner object  with example: obj = modelTuner(method, loss)