Input: Identify the most salient words:

students gathered at their graduation .

Output: gather
graduation
student

Input: Identify the most salient words:

trains ply between stations through the tunnel .

Output: station
train
tunnel

Input: Identify the most salient words:

clouds coming in the sky bringing the rain

Output: bring
cloud
rain
sky

Input: Identify the most salient words:

close up shot of high school senior girl in front

Output:
close
front
shot