code: def loss(self, y_true, y_pred):
      return NotImplementedError()
  
file_path: ML-From-Scratch/mlfromscratch/deep_learning/loss_functions.py
imports: from __future__ import division
  import numpy
  from mlfromscratch.utils import accuracy_score
  from mlfromscratch.deep_learning.activation_functions import Sigmoid
label_desc: Use image node_id 1 for calling the Loss obj's underlying member method code with example usage: obj.loss(y_true, y_pred) and returns: NotImplementedError