You need to go to Extract Data under your model on https://app.nanonets.com

You need to use the "Verification" feature to improve the model performance so that it captures fields it has missed in the future.

Step 1: Verify the fields if they have been captured correctly. If not, correct them and it automatically gets captured as "Verified"

You can also use the "Verify Data" option in the bottom if all the fields on the invoice have been captured correctly.

Do this for at least 10 files. 

Step 2: Click on "Improve Model" under the "Verified" files tab

Step 3: Give confirmation of re-training

This will trigger a model re-train - i.e. it will learn from the input data you've provided and not make the same mistakes in the future.