Convert the job description to init params that can be handled by the class constructor

        Args:
            job_details: the returned job details from a describe_training_job API call.
            model_channel_name (str): Name of the channel where pre-trained model data will be downloaded.

        Returns:
             dictionary: The transformed init_params

def _prepare_init_params_from_job_description(cls, job_details, model_channel_name=None):
        """Convert the job description to init params that can be handled by the class constructor

        Args:
            job_details: the returned job details from a describe_training_job API call.
            model_channel_name (str): Name of the channel where pre-trained model data will be downloaded.

        Returns:
             dictionary: The transformed init_params

        """
        init_params = super(Chainer, cls)._prepare_init_params_from_job_description(job_details, model_channel_name)

        for argument in [Chainer._use_mpi, Chainer._num_processes, Chainer._process_slots_per_host,
                         Chainer._additional_mpi_options]:

            value = init_params['hyperparameters'].pop(argument, None)
            if value:
                init_params[argument[len('sagemaker_'):]] = value

        image_name = init_params.pop('image')
        framework, py_version, tag, _ = framework_name_from_image(image_name)

        if not framework:
            # If we were unable to parse the framework name from the image it is not one of our
            # officially supported images, in this case just add the image to the init params.
            init_params['image_name'] = image_name
            return init_params

        init_params['py_version'] = py_version
        init_params['framework_version'] = framework_version_from_tag(tag)

        training_job_name = init_params['base_job_name']

        if framework != cls.__framework_name__:
            raise ValueError("Training job: {} didn't use image for requested framework".format(training_job_name))
        return init_params