@balaji.ambresh there is no issue with notebook, when I told to make change for another error, he encountered this error and when I looked at his codes, seemed like he extra code line added, so I advised him to get first fresh copy.
I am sharing the linked error to this error which was encountered first, just in case any learner encountered similar error. The IOPub data rate limit error is usually because of incorrect recalling of dataset when text and labels were recalled separately, but in case dataset was recalled correct and still model shows incorrect parameters, then next lookout was fit label encoder, where for this learner I suspected there was editing/addition of codes lines which got transferred to the dataset codes.
Regards
DP