W 2 A1 | 'Image2Vector_Test' undefined

I just started studying deep learning, while practicing python basics with numpy assignment, all the test functions are displayed as not defined.“name ‘image2vector_test’ is not defined

That simply means you have not run the earlier cells in the notebook that import those functions. Try “Cell → Run All Above” and then it should work.

There is a topic about that on the DLS FAQ Thread, which is worth a scan if you’re just getting started here to understand what is covered there.