code: def close(self):
      if self.mode == "w":
          if self.archive:
              self.f = self.archive.open(
                  self.root_path, mode="w", force_zip64=True
              )
          else:
              self.f = open(self.root_path, mode="wb")
          np.savez(self.f, **self.contents)
      self.f.close()
  
imports: import datetime
  import io
  import json
  import tempfile
  import warnings
  import zipfile
  import numpy
  from keras.backend.common import global_state
  from keras.layers.layer import Layer
  from keras.losses.loss import Loss
  from keras.metrics.metric import Metric
  from keras.optimizers.optimizer import Optimizer
  from keras.saving.serialization_lib import ObjectSharingScope
  from keras.saving.serialization_lib import deserialize_keras_object
  from keras.saving.serialization_lib import serialize_keras_object
  from keras.trainers.compile_utils import CompileMetrics
  from keras.utils import file_utils
  from keras.utils import naming
  from keras.version import __version__
label_desc: Use image node_id 4 for calling the NpzIOStore obj's underlying member method code with example usage: obj.close() without return types