  Situation Recognition is the task of generating a structured summary of what
is happening in an image using an activity verb and the semantic roles played
by actors and objects. In this task, the same activity verb can describe a
diverse set of situations as well as the same actor or object category can play
a diverse set of semantic roles depending on the situation depicted in the
image. Hence a situation recognition model needs to understand the context of
the image and the visual-linguistic meaning of semantic roles. Therefore, we
leverage the CLIP foundational model that has learned the context of images via
language descriptions. We show that deeper-and-wider multi-layer perceptron
(MLP) blocks obtain noteworthy results for the situation recognition task by
using CLIP image and text embedding features and it even outperforms the
state-of-the-art CoFormer, a Transformer-based model, thanks to the external
implicit visual-linguistic knowledge encapsulated by CLIP and the expressive
power of modern MLP block designs. Motivated by this, we design a
cross-attention-based Transformer using CLIP visual tokens that model the
relation between textual roles and visual entities. Our cross-attention-based
Transformer known as ClipSitu XTF outperforms existing state-of-the-art by a
large margin of 14.1\% on semantic role labelling (value) for top-1 accuracy
using imSitu dataset. {Similarly, our ClipSitu XTF obtains state-of-the-art
situation localization performance.} We will make the code publicly available.
