[generative_ai]: extras packages not being installed

[glasnt]

In which file did you encounter the issue?

#12865 (comment)

python-docs-samples/generative_ai/model_tuning/requirements.txt

Line 6 in 5d0f1fa

google-cloud-aiplatform[all]==1.90.0

python-docs-samples/generative_ai/evaluation/requirements.txt

Line 6 in 5d0f1fa

google-cloud-aiplatform[all]==1.90.0

Did you change the file? If so, how?

Updating to google-cloud-aiplatform version 1.90.0

Describe the issue

Testing returns import errors for sklearn

E   ModuleNotFoundError: No module named 'sklearn'

https://btx.cloud.google.com/invocations/77bb07ba-75b4-483e-a46a-12c548954f7c/log

[glasnt]

sklearn comes from scikit-learn, which is installed optionally when using google-cloud-aiplatform, specifically in google-cloud-aiplatform[evaluation] or google-cloud-aiplatform[testing].

It appears [all] is not a default extras specification (dependency specifiers, originally PEP-0508), and it is not explicitly defined in https://github.com/googleapis/python-aiplatform/blob/main/setup.py

google-cloud-aiplatform[all] is specified in a number of samples, but in theory is the same as just google-cloud-aiplatform.

Checking other extras options, [full] is possibly whats intended by [all], but this adds an additional ~74 packages and may not be appropriate for samples. evaluation may be the minimal change required.

The dependencies required by other samples should be confirmed and updated (in theory, would be the default no-extras if the samples work without extra dependencies)