[node] Return multiple tensor when savedModel has one input multi outputs

[kangyizhang]

When SavedModel has one input multi outpus, it should return an array of output tensors.

To see the logs from the Cloud Build CI, please join either our discussion or announcement mailing list.

---

This change is 

[pyu10055]

Reviewable status: 0 of 1 approvals obtained (waiting on @kangyizhang and @pyu10055)

---

tfjs-node/src/saved_model_test.ts, line 432 at r1 (raw file):

  });

  it('execute model with single inputs and outputs', async () => {

single input and multiple outputs?

---

tfjs-node/src/saved_model_test.ts, line 440 at r1 (raw file):

    const output1 = output[0];
    const output2 = output[1];
    expect(output1.shape).toEqual(input.shape);

this is test is bit confusing, why output is same as input? maybe states that this model is an identity op

---

tfjs-node/src/saved_model_test.ts, line 459 at r1 (raw file):

    const output1 = output['output_0'];
    const output2 = output['output_1'];
    expect(output1.shape).toEqual(input1.shape);

this old test seems to cover multiple outputs case, why it did not fail previously?

[kangyizhang]

Reviewable status: 0 of 1 approvals obtained (waiting on @pyu10055)

---

tfjs-node/src/saved_model_test.ts, line 432 at r1 (raw file):

Previously, pyu10055 (Ping Yu) wrote…

single input and multiple outputs?

done

---

tfjs-node/src/saved_model_test.ts, line 440 at r1 (raw file):

Previously, pyu10055 (Ping Yu) wrote…

this is test is bit confusing, why output is same as input? maybe states that this model is an identity op

added some comments explaining what the test model is doing

---

tfjs-node/src/saved_model_test.ts, line 459 at r1 (raw file):

Previously, pyu10055 (Ping Yu) wrote…

this old test seems to cover multiple outputs case, why it did not fail previously?

this old test covers model multiple inputs and multiple output. But if the model has single input and multiple outputs, when running the model with model.predict(input), the code will only return one output tensor. This PR fixes it.

[pyu10055]

Reviewed 7 of 8 files at r1, 1 of 1 files at r2.
Reviewable status: complete! 1 of 1 approvals obtained (waiting on @pyu10055)