Thursday, May 30, 2024

Modular visible query answering by way of code era – Google Analysis Weblog


Visible query answering (VQA) is a machine studying process that requires a mannequin to reply a query about a picture or a set of pictures. Typical VQA approaches want a considerable amount of labeled coaching knowledge consisting of hundreds of human-annotated question-answer pairs related to pictures. In recent times, advances in large-scale pre-training have led to the event of VQA strategies that carry out effectively with fewer than fifty coaching examples (few-shot) and with none human-annotated VQA coaching knowledge (zero-shot). Nonetheless, there may be nonetheless a big efficiency hole between these strategies and state-of-the-art totally supervised VQA strategies, equivalent to MaMMUT and VinVL. Particularly, few-shot strategies wrestle with spatial reasoning, counting, and multi-hop reasoning. Moreover, few-shot strategies have usually been restricted to answering questions on single pictures.

To enhance accuracy on VQA examples that contain complicated reasoning, in “Modular Visible Query Answering by way of Code Technology,” to look at ACL 2023, we introduce CodeVQA, a framework that solutions visible questions utilizing program synthesis. Particularly, when given a query about a picture or set of pictures, CodeVQA generates a Python program (code) with easy visible features that enable it to course of pictures, and executes this program to find out the reply. We reveal that within the few-shot setting, CodeVQA outperforms prior work by roughly 3% on the COVR dataset and a pair of% on the GQA dataset.

CodeVQA

The CodeVQA method makes use of a code-writing massive language mannequin (LLM), equivalent to PALM, to generate Python applications (code). We information the LLM to appropriately use visible features by crafting a immediate consisting of an outline of those features and fewer than fifteen “in-context” examples of visible questions paired with the related Python code for them. To pick out these examples, we compute embeddings for the enter query and of the entire questions for which we now have annotated applications (a randomly chosen set of fifty). Then, we choose questions which have the best similarity to the enter and use them as in-context examples. Given the immediate and query that we need to reply, the LLM generates a Python program representing that query.

We instantiate the CodeVQA framework utilizing three visible features: (1) question, (2) get_pos, and (3) find_matching_image.

  • Question, which solutions a query a few single picture, is carried out utilizing the few-shot Plug-and-Play VQA (PnP-VQA) technique. PnP-VQA generates captions utilizing BLIP — an image-captioning transformer pre-trained on thousands and thousands of image-caption pairs — and feeds these right into a LLM that outputs the solutions to the query.
  • Get_pos, which is an object localizer that takes an outline of an object as enter and returns its place within the picture, is carried out utilizing GradCAM. Particularly, the outline and the picture are handed by way of the BLIP joint text-image encoder, which predicts an image-text matching rating. GradCAM takes the gradient of this rating with respect to the picture options to search out the area most related to the textual content.
  • Find_matching_image, which is utilized in multi-image questions to search out the picture that greatest matches a given enter phrase, is carried out by utilizing BLIP textual content and picture encoders to compute a textual content embedding for the phrase and a picture embedding for every picture. Then the dot merchandise of the textual content embedding with every picture embedding symbolize the relevance of every picture to the phrase, and we choose the picture that maximizes this relevance.

The three features will be carried out utilizing fashions that require little or no annotation (e.g., textual content and image-text pairs collected from the online and a small variety of VQA examples). Moreover, the CodeVQA framework will be simply generalized past these features to others {that a} person may implement (e.g., object detection, picture segmentation, or data base retrieval).

Illustration of the CodeVQA technique. First, a big language mannequin generates a Python program (code), which invokes visible features that symbolize the query. On this instance, a easy VQA technique (question) is used to reply one a part of the query, and an object localizer (get_pos) is used to search out the positions of the objects talked about. Then this system produces a solution to the unique query by combining the outputs of those features.

Outcomes

The CodeVQA framework appropriately generates and executes Python applications not just for single-image questions, but additionally for multi-image questions. For instance, if given two pictures, every exhibiting two pandas, a query one may ask is, “Is it true that there are 4 pandas?” On this case, the LLM converts the counting query in regards to the pair of pictures right into a program through which an object rely is obtained for every picture (utilizing the question operate). Then the counts for each pictures are added to compute a complete rely, which is then in comparison with the quantity within the unique query to yield a sure or no reply.

We consider CodeVQA on three visible reasoning datasets: GQA (single-image), COVR (multi-image), and NLVR2 (multi-image). For GQA, we offer 12 in-context examples to every technique, and for COVR and NLVR2, we offer six in-context examples to every technique. The desk beneath reveals that CodeVQA improves constantly over the baseline few-shot VQA technique on all three datasets.

Methodology       GQA       COVR       NLVR2      
Few-shot PnP-VQA       46.56       49.06       63.37      
CodeVQA       49.03       54.11       64.04      

Outcomes on the GQA, COVR, and NLVR2 datasets, exhibiting that CodeVQA constantly improves over few-shot PnP-VQA. The metric is exact-match accuracy, i.e., the proportion of examples through which the anticipated reply precisely matches the ground-truth reply.

We discover that in GQA, CodeVQA’s accuracy is roughly 30% larger than the baseline on spatial reasoning questions, 4% larger on “and” questions, and three% larger on “or” questions. The third class contains multi-hop questions equivalent to “Are there salt shakers or skateboards within the image?”, for which the generated program is proven beneath.

img = open_image("Image13.jpg")
salt_shakers_exist = question(img, "Are there any salt shakers?")
skateboards_exist = question(img, "Are there any skateboards?")
if salt_shakers_exist == "sure" or skateboards_exist == "sure":
    reply = "sure"
else:
    reply = "no"

In COVR, we discover that CodeVQA’s achieve over the baseline is larger when the variety of enter pictures is bigger, as proven within the desk beneath. This development signifies that breaking the issue down into single-image questions is helpful.

         Variety of pictures      
Methodology    1    2    3    4    5   
Few-shot PnP-VQA     91.7    51.5    48.3    47.0    46.9   
CodeVQA    75.0    53.3    48.7    53.2    53.4   

Conclusion

We current CodeVQA, a framework for few-shot visible query answering that depends on code era to carry out multi-step visible reasoning. Thrilling instructions for future work embody increasing the set of modules used and creating an analogous framework for visible duties past VQA. We be aware that care ought to be taken when contemplating whether or not to deploy a system equivalent to CodeVQA, since vision-language fashions like those utilized in our visible features have been proven to exhibit social biases. On the identical time, in comparison with monolithic fashions, CodeVQA presents extra interpretability (by way of the Python program) and controllability (by modifying the prompts or visible features), that are helpful in manufacturing methods.

Acknowledgements

This analysis was a collaboration between UC Berkeley’s Synthetic Intelligence Analysis lab (BAIR) and Google Analysis, and was performed by Sanjay Subramanian, Medhini Narasimhan, Kushal Khangaonkar, Kevin Yang, Arsha Nagrani, Cordelia Schmid, Andy Zeng, Trevor Darrell, and Dan Klein.

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