I want to know that how can I get the file of haarcascade_frontalface_alt_xml
Haarcascades file
The said haarcascade file is given in the training dataset folder. Check out there itself.
Hope this helped 
Where is training dataset folder situated
It is with the challenge question itself, see at bottom right, it would be beside submit button saying something like “Training Dataset”.
Hope this helped
I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.
On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.