name '_precision_recall_curve' is not defined

This error message indicates that the code is trying to call a function or variable named `_precision_recall_curve`, but it is not defined in the current scope.

There are a few possible reasons for this error:

1. The function or variable was not imported properly: Make sure that you have imported all the necessary modules and functions, and that they are spelled correctly.

2. The function or variable was defined in a different module or file: If the function or variable was defined in another module or file, make sure that you have imported it correctly and that it is in the correct scope.

3. There is a typo in the code: Check the spelling of the function or variable to make sure that it is correct.

To fix this error, you should check your code and make sure that the function or variable is defined and imported correctly. If you are still having trouble, you can try searching for the function or variable in the documentation or online to see if there are any examples or explanations that can help.