I have deleted some part of this test code (which was already given in lab assignment_) ...can I know what was actually given

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
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Hello @POLASA_DURGADEVI

Welcome to the community.

You will have to get a new copy of the notebook to get back the missing parts.

Please follow these steps:

  1. Make a copy of your current notebook (rename to something else) so that you dont lose your work
  2. Click on File → Open → Tick the box on the left against the original notebook. Click shutdown
  3. Tick the box on the left against the original notebook. Click delete
  4. Go to the top right of the notebook. Click on help → Get latest version.

The original notebook in its pristine state will now be available in your folder. You can copy the work from your saved notebook to this notebook