Output on the case of deepxde example

[wzw1029]

I've changed the number of inputs in the code in the deepxde example function mf_dataset file you gave me from 1 to 3, and the output is still 1. I don't understand why there are seven columns in the result, and I can't see any connection between the result and the data I've inputted, and I'm trying to figure out what the code calculates. The first three columns are the x-values I've inputted, but I don't know why they are the same, and what the last two columns represent. The first three columns are supposed to be the x-values I entered, but I don't know why the next two columns are the same, and what do the values in the last two columns represent?