Enabling conversational interplay on cellular with LLMs – Google AI Weblog

Clever assistants on cellular units have considerably superior language-based interactions for performing easy each day duties, reminiscent of setting a timer or turning on a flashlight. Regardless of the progress, these assistants nonetheless face limitations in supporting conversational interactions in cellular consumer interfaces (UIs), the place many consumer duties are carried out. For instance, they can not reply a consumer’s query about particular data displayed on a display screen. An agent would want to have a computational understanding of graphical user interfaces (GUIs) to attain such capabilities.

Prior analysis has investigated a number of essential technical constructing blocks to allow conversational interplay with cellular UIs, together with summarizing a mobile screen for customers to rapidly perceive its function, mapping language instructions to UI actions and modeling GUIs in order that they’re extra amenable for language-based interplay. Nonetheless, every of those solely addresses a restricted side of conversational interplay and requires appreciable effort in curating large-scale datasets and coaching devoted fashions. Moreover, there’s a broad spectrum of conversational interactions that may happen on cellular UIs. Subsequently, it’s crucial to develop a light-weight and generalizable method to comprehend conversational interplay.

In “Enabling Conversational Interaction with Mobile UI using Large Language Models”, offered at CHI 2023, we examine the viability of using massive language fashions (LLMs) to allow numerous language-based interactions with cellular UIs. Latest pre-trained LLMs, reminiscent of PaLM, have demonstrated talents to adapt themselves to varied downstream language duties when being prompted with a handful of examples of the goal process. We current a set of prompting methods that allow interplay designers and builders to rapidly prototype and check novel language interactions with customers, which saves time and sources earlier than investing in devoted datasets and fashions. Since LLMs solely take textual content tokens as enter, we contribute a novel algorithm that generates the textual content illustration of cellular UIs. Our outcomes present that this method achieves aggressive efficiency utilizing solely two knowledge examples per process. Extra broadly, we show LLMs’ potential to basically remodel the longer term workflow of conversational interplay design.

Animation exhibiting our work on enabling varied conversational interactions with cellular UI utilizing LLMs.

Prompting LLMs with UIs

LLMs assist in-context few-shot studying through prompting — as a substitute of fine-tuning or re-training fashions for every new process, one can immediate an LLM with a couple of enter and output knowledge exemplars from the goal process. For a lot of pure language processing duties, reminiscent of question-answering or translation, few-shot prompting performs competitively with benchmark approaches that prepare a mannequin particular to every process. Nonetheless, language fashions can solely take textual content enter, whereas cellular UIs are multimodal, containing textual content, picture, and structural data of their view hierarchy knowledge (i.e., the structural knowledge containing detailed properties of UI parts) and screenshots. Furthermore, straight inputting the view hierarchy knowledge of a cellular display screen into LLMs will not be possible because it accommodates extreme data, reminiscent of detailed properties of every UI factor, which might exceed the enter size limits of LLMs.

To handle these challenges, we developed a set of methods to immediate LLMs with cellular UIs. We contribute an algorithm that generates the textual content illustration of cellular UIs utilizing depth-first search traversal to transform the Android UI’s view hierarchy into HTML syntax. We additionally make the most of chain of thought prompting, which includes producing intermediate outcomes and chaining them collectively to reach on the closing output, to elicit the reasoning means of the LLM.

Animation exhibiting the method of few-shot prompting LLMs with cellular UIs.

Our immediate design begins with a preamble that explains the immediate’s function. The preamble is adopted by a number of exemplars consisting of the enter, a sequence of thought (if relevant), and the output for every process. Every exemplar’s enter is a cellular display screen within the HTML syntax. Following the enter, chains of thought may be supplied to elicit logical reasoning from LLMs. This step will not be proven within the animation above as it’s elective. The duty output is the specified end result for the goal duties, e.g., a display screen abstract or a solution to a consumer query. Few-shot prompting may be achieved with multiple exemplar included within the immediate. Throughout prediction, we feed the mannequin the immediate with a brand new enter display screen appended on the finish.


We carried out complete experiments with 4 pivotal modeling duties: (1) display screen question-generation, (2) display screen summarization, (3) display screen question-answering, and (4) mapping instruction to UI motion. Experimental outcomes present that our method achieves aggressive efficiency utilizing solely two knowledge examples per process.

Job 1: Display query era

Given a cellular UI display screen, the purpose of display screen question-generation is to synthesize coherent, grammatically appropriate pure language questions related to the UI parts requiring consumer enter.

We discovered that LLMs can leverage the UI context to generate questions for related data. LLMs considerably outperformed the heuristic method (template-based era) relating to query high quality.

Instance display screen questions generated by the LLM. The LLM can make the most of display screen contexts to generate grammatically appropriate questions related to every enter discipline on the cellular UI, whereas the template method falls quick.

We additionally revealed LLMs’ means to mix related enter fields right into a single query for environment friendly communication. For instance, the filters asking for the minimal and most worth have been mixed right into a single query: “What’s the value vary?

We noticed that the LLM may use its prior data to mix a number of associated enter fields to ask a single query.

In an analysis, we solicited human rankings on whether or not the questions have been grammatically appropriate (Grammar) and related to the enter fields for which they have been generated (Relevance). Along with the human-labeled language high quality, we routinely examined how properly LLMs can cowl all the weather that must generate questions (Protection F1). We discovered that the questions generated by LLM had nearly good grammar (4.98/5) and have been extremely related to the enter fields displayed on the display screen (92.8%). Moreover, LLM carried out properly by way of protecting the enter fields comprehensively (95.8%).

      Template       2-shot LLM      
Grammar       3.6 (out of 5)       4.98 (out of 5)      
Relevance       84.1%       92.8%      
Protection F1       100%       95.8%      

Job 2: Display summarization

Display summarization is the automated era of descriptive language overviews that cowl important functionalities of cellular screens. The duty helps customers rapidly perceive the aim of a cellular UI, which is especially helpful when the UI will not be visually accessible.

Our outcomes confirmed that LLMs can successfully summarize the important functionalities of a cellular UI. They’ll generate extra correct summaries than the Screen2Words benchmark mannequin that we beforehand launched utilizing UI-specific textual content, as highlighted within the coloured textual content and containers under.

Instance abstract generated by 2-shot LLM. We discovered the LLM is ready to use particular textual content on the display screen to compose extra correct summaries.

Curiously, we noticed LLMs utilizing their prior data to infer data not offered within the UI when creating summaries. Within the instance under, the LLM inferred the subway stations belong to the London Tube system, whereas the enter UI doesn’t comprise this data.

LLM makes use of its prior data to assist summarize the screens.

Human analysis rated LLM summaries as extra correct than the benchmark, but they scored decrease on metrics like BLEU. The mismatch between perceived high quality and metric scores echoes recent work exhibiting LLMs write higher summaries regardless of computerized metrics not reflecting it.


Left: Display summarization efficiency on computerized metrics. Proper: Display summarization accuracy voted by human evaluators.

Job 3: Display question-answering

Given a cellular UI and an open-ended query asking for data relating to the UI, the mannequin ought to present the proper reply. We concentrate on factual questions, which require solutions based mostly on data offered on the display screen.

Instance outcomes from the display screen QA experiment. The LLM considerably outperforms the off-the-shelf QA baseline mannequin.

We report efficiency utilizing 4 metrics: Precise Matches (equivalent predicted reply to floor fact), Comprises GT (reply totally containing floor fact), Sub-String of GT (reply is a sub-string of floor fact), and the Micro-F1 rating based mostly on shared phrases between the anticipated reply and floor fact throughout your entire dataset.

Our outcomes confirmed that LLMs can appropriately reply UI-related questions, reminiscent of “what is the headline?”. The LLM carried out considerably higher than baseline QA mannequin DistillBERT, attaining a 66.7% totally appropriate reply fee. Notably, the 0-shot LLM achieved a precise match rating of 30.7%, indicating the mannequin’s intrinsic query answering functionality.

Fashions       Precise Matches       Comprises GT       Sub-String of GT       Micro-F1      
0-shot LLM       30.7%       6.5%       5.6%       31.2%      
1-shot LLM       65.8%       10.0%       7.8%       62.9%      
2-shot LLM       66.7%       12.6%       5.2%       64.8%      
DistillBERT       36.0%       8.5%       9.9%       37.2%      

Job 4: Mapping instruction to UI motion

Given a cellular UI display screen and pure language instruction to regulate the UI, the mannequin must predict the ID of the item to carry out the instructed motion. For instance, when instructed with “Open Gmail,” the mannequin ought to appropriately establish the Gmail icon on the house display screen. This process is helpful for controlling cellular apps utilizing language enter reminiscent of voice entry. We launched this benchmark task beforehand.

Instance utilizing knowledge from the PixelHelp dataset. The dataset accommodates interplay traces for frequent UI duties reminiscent of turning on wifi. Every hint accommodates a number of steps and corresponding directions.

We assessed the efficiency of our method utilizing the Partial and Full metrics from the Seq2Act paper. Partial refers back to the share of appropriately predicted particular person steps, whereas Full measures the portion of precisely predicted complete interplay traces. Though our LLM-based methodology didn’t surpass the benchmark educated on huge datasets, it nonetheless achieved exceptional efficiency with simply two prompted knowledge examples.

Fashions       Partial       Full      
0-shot LLM       1.29       0.00      
1-shot LLM (cross-app)       74.69       31.67      
2-shot LLM (cross-app)       75.28       34.44      
1-shot LLM (in-app)       78.35       40.00      
2-shot LLM (in-app)       80.36       45.00      
Seq2Act       89.21       70.59      

Takeaways and conclusion

Our research reveals that prototyping novel language interactions on cellular UIs may be as straightforward as designing a knowledge exemplar. Because of this, an interplay designer can quickly create functioning mock-ups to check new concepts with finish customers. Furthermore, builders and researchers can discover totally different potentialities of a goal process earlier than investing important efforts into growing new datasets and fashions.

We investigated the feasibility of prompting LLMs to allow varied conversational interactions on cellular UIs. We proposed a collection of prompting methods for adapting LLMs to cellular UIs. We carried out intensive experiments with the 4 essential modeling duties to guage the effectiveness of our method. The outcomes confirmed that in comparison with conventional machine studying pipelines that consist of pricey knowledge assortment and mannequin coaching, one may quickly understand novel language-based interactions utilizing LLMs whereas attaining aggressive efficiency.


We thank our paper co-author Gang Li, and admire the discussions and suggestions from our colleagues Chin-Yi Cheng, Tao Li, Yu Hsiao, Michael Terry and Minsuk Chang. Particular due to Muqthar Mohammad and Ashwin Kakarla for his or her invaluable help in coordinating knowledge assortment. We thank John Guilyard for serving to create animations and graphics within the weblog.

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