feat: Added aiplatform.Model.update method

[ivanmkc]

Added ability to update display_name, description and labels.

Fixes https://b.corp.google.com/issues/213921337

TODO

• Manual test
• Automated unit test
• Automated integration test

Test code

models = Model.list()

my_model = models[0]

print(f"eTag: {my_model._gca_resource.etag}")
print(f"Current display_name: {my_model.display_name}")
my_model = my_model.update(display_name=my_model.display_name + "_new")
print(f"Current display_name: {my_model.display_name}")

print(f"eTag: {my_model._gca_resource.etag}")
my_model = Model(my_model.resource_name)  # Fetch model from server
print(f"eTag after fetch: {my_model._gca_resource.etag}")
print(f"Current description: {my_model.description}")
my_model = my_model.update(description=my_model.description + "_new")
print(f"Current description: {my_model.description}")

print(f"eTag: {my_model._gca_resource.etag}")
my_model = Model(my_model.resource_name)  # Fetch model from server
print(f"eTag after fetch: {my_model._gca_resource.etag}")
print(f"Current labels: {my_model.labels}")
my_model = my_model.update(labels={"my_label": "updated"})
print(f"Current labels: {my_model.labels}")

Bug?

There's some weirdness going on with the eTags though. If I don't "refetch" the model from the server, I get an "etag mismatch" exception on the subsequent update.

Tracked at b/214432914

[sasha-gitg]

Please add or update an integration test to use this method:

An additional test case can be added here using the same model: https://github.com/googleapis/python-aiplatform/blob/main/tests/system/aiplatform/test_model_upload.py

It can also be added to this e2e test: https://github.com/googleapis/python-aiplatform/blob/main/tests/system/aiplatform/test_e2e_tabular.py

[sasha-gitg]

LGTM!