Some Issues about paper

[YourGc]

Hello, i have some issues about paper,following:

1、does heat-maps only use for detect the pair of coordinates ? why need heat-map but not vector ? if my target is simple, which mean one image only has one target, can i remove the Heatmaps / embeddings/ offsets three parts of CNN and replaced by a vetor?

2、Does offsets only help to reduce the error of coordinates because heatmaps' resolution is not the same as input's? what if using FCN ?

3、I found that there is no uniform number of classes in the project configuration.

Sorry i am new in CV