Q: "Two young men in basketball clothes walking together." Does this mean that "Humans walking together"?
A: yes

Q: "A child wearing a yellow shirt is jumping up and down." Does this mean that "A tall human jumping."?
A: it is not possible to tell

Q: "A woman in a white shirt is making a face while trying to lift a bar." Does this mean that "A man in a white shirt is making a face while trying to lift a bar."?
A: no

Q: "People are sitting on a train or subway." Does this mean that "There are people sitting."?
A:
yes