Initialize a VoiceModel object from a json dictionary.

def _from_dict(cls, _dict):
        """Initialize a VoiceModel object from a json dictionary."""
        args = {}
        if 'customization_id' in _dict:
            args['customization_id'] = _dict.get('customization_id')
        else:
            raise ValueError(
                'Required property \'customization_id\' not present in VoiceModel JSON'
            )
        if 'name' in _dict:
            args['name'] = _dict.get('name')
        if 'language' in _dict:
            args['language'] = _dict.get('language')
        if 'owner' in _dict:
            args['owner'] = _dict.get('owner')
        if 'created' in _dict:
            args['created'] = _dict.get('created')
        if 'last_modified' in _dict:
            args['last_modified'] = _dict.get('last_modified')
        if 'description' in _dict:
            args['description'] = _dict.get('description')
        if 'words' in _dict:
            args['words'] = [Word._from_dict(x) for x in (_dict.get('words'))]
        return cls(**args)