Not getting results as aspected?

@abhijithneilabraham thanks a lot for your beautiful work, i have some questions,
1. What is the efficient way to create the schema, like we cannot analyze the data every time, and create the schema for that?
2. I tried with some custom datasets its performing well but after passing the schema , it is not recognizing some of the columns?
3. Can I fine tune your model?

Thanks in advance!