C2_W3_Assignment exercise 7 few test cases failing

Exercise 7 need to be completed using exercise 5 & 6 function calls, both 5- & 6 all unit test cases are passed, but for exercise 7, 3 test cases are failing, not able figure out the mistake.

3unit test cases are failing, can someone help

Please share a screenshot of your codes by personal DM. Click on my name and then message

Regards
DP

This is the msg its showing, User public profile is hidden

you don’t need to see my profile. ok wait let me ping you

hi @balaganeshS

Please next time onwards send screenshot rather than copy paste as error are not clearly catched copy paste codes.

if you notice the def statement, mentions unknown_token = " ", this needs to be added your vocabulary code line according to the instructions given before the grade cell. you only added the train_data and count_threshold