code: def _check_available():
      if not _available:
          msg = """h5py is not installed on your environment.
  Please install h5py to activate hdf5 serializers.
  
    $ pip install h5py"""
          raise RuntimeError(msg)
  
imports: import sys
  import numpy
  import six
  from chainer.backends import _chainerx
  from chainer.backends import _cpu
  from chainer.backends import cuda
  from chainer.backends import intel64
  from chainer import serializer
  import chainerx
label_desc: Use image node_id 1 for calling a global function with example usage: _check_available() without return types