docs: public InputPreProcessor getInputPreprocessor(InputType... inputType) throws InvalidKerasConfigurationException {
          InputPreProcessor preprocessor = null;
          if (this.layer != null) {
              if (inputType.length > 1)
                  throw new InvalidKerasConfigurationException(
                          "Keras layer of type \"" + this.className + "\" accepts only one input");
              preprocessor = this.layer.getPreProcessorForInputType(inputType[0]);
          }
          return preprocessor;
      }