new_contents: import abc
  import tensorflow as tf
  
  
  
  class Model(metaclass=abc.ABCMeta):
    @abc.astractmethod
    def __init__(self, **hyperparameters_and_initial_parameters):
      return NotImplemented
  
    @abc.astractmethod
    def train(self, *input_tensors) -> tf.Tensor: # scalar loss
      return NotImplemented
  
    @abc.astractmethod
    def test(self, *input_tensors) -> tf.Tensor: # labels
      return NotImplemented
  
subject: Add model module