code: public KerasModelBuilder modelJsonFilename(String modelJsonFilename) throws IOException {
          checkForExistence(modelJsonFilename);
          this.modelJson = new String(Files.readAllBytes(Paths.get(modelJsonFilename)));
          return this;
      }
docs: Set model architecture from file name pointing to model JSON string.
  
  @param modelJsonFilename Name of file containing model JSON string
  @return Model Builder
  @throws IOException I/O Exception