Use regional ML API endpoint in ai-explanations-image.ipynb

[davidxia]

and fix a few other commands.

• Use a regional ML API endpoint instead of global.
  • N1 VMs aren't available in global.
  • Must also specify the region later when creating the model version to prevent a not found error.
• Use the parameterized REGION instead of hardcoded us-central1 strings.
• Use mkdir -p flowers instead of mkdir flowers to not fail if the dir already exists.

TODO: this notebook doesn't run successfully yet because of this issue: https://github.com/GoogleCloudPlatform/ml-on-gcp/issues/133

[review-notebook-app[bot]]

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[davidxia]

@sararob @dizcology

[davidxia]

hi, just wondering if this PR looks good or if there's other next steps

[davidxia]

@sararob @dizcology lmk if you're still the right people to ask to review this PR or if I should ask others. Thanks!