Q: "A bunch of Caucasians are dining and their attention seems to be directed at something." Does this mean that "The caucasians are eating"?
A: yes

Q: "A group of four people congregate on a sidewalk." Does this mean that "The people are shoveling the street,"?
A: no

Q: "Several people including a woman with a yellow purse are riding a crowded train." Does this mean that "The couple rides the empty train quietly."?
A: no

Q: "A man in a cap, sweatshirt, and jeans works on wooden banisters." Does this mean that "A man is painting the banisters in his house."?
A:
it is not possible to tell