how to get details from invoices automatically using marmut 

without needing any prior training on data-sets....
If you have hundreds of invoices coming in every month, getting to parse them into a structured format even though your invoices follow no strict format, you can use marmut's invoice parsing recipe.
The invoice parsing recipe on the marmut platform parses:
Service being provided
Payor
Payor Address
Payee
Payee Address
Amount
Tax
Invoice Number
Date
Purchase Order
from your invoice in one swoop and in a matter of seconds.
If you are looking for more data points from your invoice, you can edit the invoice parsing recipe to add additional custom fields along with a description of what your "custom field" basically is. You can review the other pre-built data fields in customizing your new custom data field. For example, in the Invoice Parsing recipe, we use "Invoice summary" within angled brackets in many of our field descriptions, which is nothing but a reference to the field created earlier to get the text of the invoice, as the base to parse other relevant information for other fields.
If you aren't getting the exact data point, you can change the description to get the field exactly the way you want it. You can also format the custom field the way you want it while keeping the tool selection to default i.e. "Local Documents".
That's it.
You can now parse invoices in bulk.