code: def small_abc_image_recognition():
      
      images = [];
      images += IMAGE_SYMBOL_SAMPLES.LIST_IMAGES_SYMBOL_A;
      images += IMAGE_SYMBOL_SAMPLES.LIST_IMAGES_SYMBOL_B;
      images += IMAGE_SYMBOL_SAMPLES.LIST_IMAGES_SYMBOL_C;
      
      template_recognition_image(images, 250, 25);
docs: !
      @brief Trains network using letters 'A', 'B', 'C', and recognize each of them with and without noise.