Hello,
Yes there is a bond in which you will have to pay a sum of 2 lacs if you discontinue a diploma course in between the course to the government ,
If you want to see a sample of such bond you can refer to the pdf link below
https://wbuhs.ac.in/wp-content/uploads/2019/04/Discontinuation-Bond-PG-Diploma.pdf
hope this helps you ,
Best wishes for your future