code: public KerasModelBuilder weightsHdf5Filename(String weightsHdf5Filename) throws IOException {
          checkForExistence(weightsHdf5Filename);
          this.weightsArchive = new Hdf5Archive(weightsHdf5Filename);
          this.weightsRoot = config.getTrainingWeightsRoot();
          return this;
      }
docs: Set weights of the model by providing the file name of the corresponding weights HDF5 file.
  The root of the HDF5 group containing weights will be read and set from the configuration of this
  model builder instance.
  
  @param weightsHdf5Filename File name of weights HDF5
  @return Model builder