Image	Reward	Captions
(a)	CIDEr	a group of boats parked in the water on a lake
CLIP-S	several rows of boats parked near a canal mountains horizon area and a mountain horizon area horizon area horizon ear motion
CLIP-S+Grammar	a lot of boats parked on the grass next to the lake with the hills behind
Reference Captions	A blue boat docked on a green lush shore.A small marina with boats docked therea group of boats sitting together with no one aroundSome boats parked in the water at a dockboats sitting around the side of a lake by a tree
(b)	CIDEr	a zebra standing in the snow next to a brick wall
CLIP-S	a adult zebra wearing black and grey stripes standing near a brick wall area area with grey stance position stance
CLIP-S+Grammar	a large black and grey zebra standing together in the snowy ground next to a stone
Reference Captions	A zebra is standing outside in the snowOne zebra standing in snow near a stone wall.A zebra is standing in a snowy field.A zebra stands in snow in front of a wall.A zebra standing alone in the snow with a stone block wall and wooden fence behind it.
(c)	CIDEr	a black dog sitting next to a plate of food
CLIP-S	black black dog with macaroni and macaroni plate with pasta and pasta on a wooden floor plate position position position
CLIP-S+Grammar	a black dog sitting next to a plate of food on the wood floor
Reference Captions	Shaggy dog gets dinner served on a plate.A small black dog standing over a plate of food.A small dog eating a plate of broccoli.A black dog being given broccoli to eat.There is a dog staring at a plate of food
(d)	CIDEr	two elephants standing next to a tree in a zoo
CLIP-S	two adult adult and baby elephant near a tree enclosure area with a tree area enclosure motion stance ear stance
CLIP-S+Grammar	a large elephant playing with a tree in the dirt field with rocks behind it
Reference Captions	An elephant standing under the shade of a tree.An elephant standing in the middle of a rocky environment.An elephant is alone in a wooded enclosure.An elephant standing in a shaded cleaning in a wooded area.An elephant walks alone past some big rocks boulders in an open field
(e)	CIDEr	a group of people riding bikes down a city street
CLIP-S	several cyclists moving and bicycles near a restaurant and a blue advertisement outside a red brick building motion stance p
CLIP-S+Grammar	a group of people riding their bikes on the busy street with a blue sign
Reference Captions	people on bicycles ride down a busy streetA group of people are riding bikes down the street in a bike lanebike riders passing Burger King in city streetA group of bicyclists are riding in the bike lane.Bicyclists on a city street, most not using the bike lane
(f)	CIDEr	a man riding a bike next to a train
CLIP-S	older adult male riding a bicycle near a red and commuter train passing a train station motion stance ear stance
CLIP-S+Grammar	a person walking on a bike next to a red passenger train on the road
Reference Captions	A man on a bicycle riding next to a trainA person is riding a bicycle but there is a train in the background.a red and white train and a man riding a bicyclea guy that is riding his bike next to a trainA man riding a bike past a train traveling along tracks.
(g)	CIDEr	a window of an airport with planes on the runway
CLIP-S	several rows of planes parked outside a terminal window area with fog outside a terminal window motion position area motionn
CLIP-S+Grammar	a lot of airplanes parked on a wet airport terminal
Reference Captions	An airport filled with planes sitting on tarmac.The view of runway from behind the windows of airport.a truck driving towards some planes parked on the runwayPlanes on a wet tarmac unloading at arrival gates Window view from the inside of airplanes, baggage carrier and tarmac.