Fix custom model notebook examples

[tiopramayudi]

What this PR does / why we need it:

Previous PR #393 we add new notebook for custom model UPI, but the notebook is broken hence this PR aims to fix that

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

Checklist

• [ ] Added unit test, integration, and/or e2e tests
• [ ] Tested locally
• [ ] Updated documentation
• [ ] Update Swagger spec if the PR introduce API changes
• [ ] Regenerated Golang and Python client if the PR introduce API changes

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