/kind feature
I want sequence node to merge the responses from steps(could select which steps).

But I can't find a way to do it.
according to document and cmd/router/main.go
Ensemble: routes the request to multiple models and then merge the responses

and in main.go, Ensemble Node use same input in gorountines

output, statusCode, err := executeStep(step, graph, input, headers)

and I observe that sequence node only return result from final step, then check main.go.

for i := range currentNode.Steps {
	...
	responseBytes, statusCode, err = executeStep(step, graph, request, headers)
	...

}

return responseBytes, statusCode, nil

I suppose there is no such feature. (or is there any workaround?)

Describe the solution you'd like
specify responses to be merged in yaml file of InferenceGraph sequence node.

add a field in InferenceStep
beMerged: bool (optional)(if not explictly set true, response from this step is not merged)
and let Sequence Node collects these responses and merge them maybe like Ensemble Node
{${STEP_NAME}: ${RESPONSE_FROM_STEP}, ...}

Example:
if some step response is wanted

{
	"stepName2" : {"prediction" : "2"}
	"finalStepName" : {"prediction" : "3"}
}

stepName could be empty, then use index(which start from 0) instead

{
	"1": {"prediction": "2"}
	"2" {"prediction": "3"}
}

if no other step response wanted, maintain same structure

{
	"prediction": "3"
}

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Links to the design documents:
[Optional, start with the short-form RFC template to outline your ideas and get early feedback.]
[Required, use the longer-form design doc template to specify and discuss your design in more detail]