code: def from_api_repr(cls, resource):
          
          if (
              "datasetReference" not in resource
              or "datasetId" not in resource["datasetReference"]
          ):
              raise KeyError(
                  "Resource lacks required identity information:"
                  '["datasetReference"]["datasetId"]'
              )
          project_id = resource["datasetReference"]["projectId"]
          dataset_id = resource["datasetReference"]["datasetId"]
          dataset = cls(DatasetReference(project_id, dataset_id))
          dataset._properties = copy.deepcopy(resource)
          return dataset
docs: Factory: construct a dataset given its API representation
  
          Args:
              resource (Dict[str: object]):
                  Dataset resource representation returned from the API
  
          Returns:
              google.cloud.bigquery.dataset.Dataset:
                  Dataset parsed from ``resource``.