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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _read_dataset_metadata(self):
 """Reads dataset metadata. Returns: instance of DatasetMetadata """

    blob = self.storage_client.get_blob(
        'dataset/' + self.dataset_name + '_dataset.csv')
    buf = BytesIO()
    blob.download_to_file(buf)
    buf.seek(0)
    return eval_lib.DatasetMetadata(buf)