<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _from_dict(cls, _dict):
 """Initialize a TableReturn object from a json dictionary."""

        args = {}
        if 'document' in _dict:
            args['document'] = DocInfo._from_dict(_dict.get('document'))
        if 'model_id' in _dict:
            args['model_id'] = _dict.get('model_id')
        if 'model_version' in _dict:
            args['model_version'] = _dict.get('model_version')
        if 'tables' in _dict:
            args['tables'] = [
                Tables._from_dict(x) for x in (_dict.get('tables'))
            ]
        return cls(**args)