code: def small_ftk_image_recognition():
      
      images = [];
      images += IMAGE_SYMBOL_SAMPLES.LIST_IMAGES_SYMBOL_F;
      images += IMAGE_SYMBOL_SAMPLES.LIST_IMAGES_SYMBOL_T;
      images += IMAGE_SYMBOL_SAMPLES.LIST_IMAGES_SYMBOL_K;
      
      template_recognition_image(images, 100, 10, 0.2);
docs: !
      @brief Trains network using letters 'F', 'T', 'K' and recognize each of them with and without noise.