Use of np.vstack([x])

Can you brief me what this does in this context as I tried without this command it worked properly,
this is used while we preprocess the uploaded image for testing purpose

Hey @Ashwin_Shetgaonkar ,

Can you share piece of codes which is using this method during the course lab or assignment?

Nice2have that you can share a public Colab of the copy of codes.

Would you mind?

Hopefully, we can go on :smiling_face: afterward.

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Hello and Greetings ,
Could you please help me what is the purpose of adding an additional axis in the array via
x = np.expand_dims(x, axis=0), and what is the purpose of using the np.vstack() function .
here down below the screenshot .
thank you in advance .