old_contents: from rest_framework import serializers
  from app.models import NnTrainingResult
  
  class NnTrainingResultSerializer(serializers.ModelSerializer):
  
      class Meta:
          model = NnTrainingResult
      
  
new_contents: from rest_framework import serializers
  from app.models import NnTrainingResult
  
  class NnTrainingResultSerializer(serializers.ModelSerializer):
  
      class Meta:
          model = NnTrainingResult
          fields = '__all__'
  
subject: add all fields to nn result serializer