How to use the gbdxtools.simpleworkflows.Task function in gbdxtools

def __build_osn_sample_workflow(self):
        workflow_json = None
        with open(os.path.join(self.data_path, 'sample_osn_workflow.json')) as fp:
            workflow_json = json.load(fp)
        self.assertIsNotNone(workflow_json)
        tasks = []
        tasks_to_ports = {}
        for task in workflow_json['tasks']:
            inputs = {}
            for input_entry in task['inputs']:
                if 'source' in input_entry:
                    inputs[input_entry['name']] = 'source:' + input_entry['source']
                elif 'value' in input_entry:
                    inputs[input_entry['name']] = input_entry['value']
            gbdx_task = Task(task['taskType'], **inputs)
            gbdx_task.name = task['name']
            self.assertIsNotNone(gbdx_task)
            tasks.append(gbdx_task)
        return Workflow(tasks, name=workflow_json['name'])

def Task(self, __task_name, **kwargs):
        return gbdxtools.simpleworkflows.Task(__task_name, **kwargs)

def ingest_vectors(self, output_port_value):
        ''' append two required tasks to the given output to ingest to VS
        '''
        # append two tasks to self['definition']['tasks']
        ingest_task = Task('IngestItemJsonToVectorServices')
        ingest_task.inputs.items = output_port_value
        ingest_task.impersonation_allowed = True

        stage_task = Task('StageDataToS3')
        stage_task.inputs.destination = 's3://{vector_ingest_bucket}/{recipe_id}/{run_id}/{task_name}'
        stage_task.inputs.data = ingest_task.outputs.result.value

        self.definition['tasks'].append(ingest_task.generate_task_workflow_json())
        self.definition['tasks'].append(stage_task.generate_task_workflow_json())

def ingest_vectors(self, output_port_value):
        ''' append two required tasks to the given output to ingest to VS
        '''
        # append two tasks to self['definition']['tasks']
        ingest_task = Task('IngestItemJsonToVectorServices')
        ingest_task.inputs.items = output_port_value
        ingest_task.impersonation_allowed = True

        stage_task = Task('StageDataToS3')
        stage_task.inputs.destination = 's3://{vector_ingest_bucket}/{recipe_id}/{run_id}/{task_name}'
        stage_task.inputs.data = ingest_task.outputs.result.value

        self.definition['tasks'].append(ingest_task.generate_task_workflow_json())
        self.definition['tasks'].append(stage_task.generate_task_workflow_json())

def Task(self, __task_name, **kwargs):
        return gbdxtools.simpleworkflows.Task(__task_name, **kwargs)