Advancements and Challenges in Generative AI: Architectures, Applications, and Ethical Implications Flora Amato1,* , Domenico Benfenati1 , Egidia Cirillo1 , Giovanni Maria De Filippis1 , Mattia Fonisto1 , Antonio Galli1 , Stefano Marrone1 , Lidia Marassi1 , Vincenzo Moscato1 , Narendra Patwardhan1 , Alberto Moccardi1 , Antonio Elia Pascarella1 , Antonio M. Rinaldi1 , Cristiano Russo1 , Carlo Sansone1 and Cristian Tommasino1,2 1 Department of Electrical Engineering and Information Technology (DIETI), University of Naples Federico II, Via Claudio 21, 80125 Naples, Italy 2 Interdepartmental Center for Research on Management and Innovation in Healthcare (CIRMIS), University of Naples Federico II, Naples, Italy Abstract Architecture, classification, and major applications of Generative AI interfaces, specifically chatbots, are presented in this paper. Research paper details how the Generative AI interfaces work with various Generative AI approaches and show the architecture and their working. On the other hand, the generative model is built using advanced machine learning techniques to build dynamic, contextually relevant responses automatically. On the other hand, the retrieval-based model builds up with dependency on a predefined response library. The paper also discusses the use of Generative AI to populate Multimedia Knowledge Graphs (KGs), presenting technologies based on the semantic analysis of deep learning and NoSQL to more effectively integrate and retrieve data. The social and ethical challenges that come with the deployment of generative models are critically reviewed. These dialogues bring forward the balance that has to be maintained between progress and necessity in technological advancements, for which the call for ethical responsibility in developing AI is made. The paper presents a comprehensive review of state-of-the-art Generative AI with special focus on the promises and pitfalls in Generative AI research related to both natural language processing and knowledge management. Keywords artificial intelligence, Generative AI 1. Introduction The term "chatbot", short for "chatterbot", was originally coined by Michael Mauldin in 1994 to describe these con- A chatbot, also known as a conversational agent, is an versational programs in his attempt to develop a Turing artificial intelligence (AI) software that can simulate a System [2]. conversation (or a chat) with a user through text or voice This work aims to explore various techniques, approaches interfaces [1]. Chatbots can use natural language process- and technologies that have been utilized for developing ing (NLP) and machine learning algorithms to understand chatbots since the late 1990s; furthermore, we will pro- user inputs and generate appropriate responses, allowing vide insights into the most common applications and use them to provide assistance, automate tasks, and perform cases. other functions without the need for human intervention. Ital-IA 2024: 4th National Conference on Artificial Intelligence, orga- nized by CINI, May 29-30, 2024, Naples, Italy 2. Architecture and Classification * Corresponding author. of Generative AI Interfaces $ flora.amato@unina.it (F. Amato); egidia.cirillo@unina.it (E. Cirillo); mattia.fonisto@unina.it (M. Fonisto); As a modern approach for architecture of Generative AI antonio.galli@unina.it (A. Galli); stefano.marrone@unina.it (S. Marrone); lidia.marassi@unina.it (L. Marassi); Interfaces, we will follow [3, 4, 5] and divide the intelli- vincenzo.moscato@unina.it (V. Moscato); gent interfaces structure proposed in the state of the art narendra.patwardhan@unina.it (N. Patwardhan); in four parts: the interface, the multimedia processor, the alberto.moccardi@unina.it (A. Moccardi); multimodal input analysis, and the response generator. antonioelia.pascarella@unina.it (A. E. Pascarella); In detail, carlo.sansone@unina.it (C. Sansone)  0000-0002-5128-5558 (F. Amato); 0009-0008-5825-8043 1. The interface is responsible for managing the (D. Benfenati); 0009-0002-8395-0724 (G. M. D. Filippis); 0000-0001-6852-0377 (S. Marrone); 0009-0006-8134-5466 interaction between the chatbot and users, which (L. Marassi); 0000-0002-4807-5664 (V. Moscato); involves receiving inputs in various forms such 0000-0002-4807-5664 (N. Patwardhan); 0000-0002-1079-7741 as text or audio and returning appropriate re- (A. E. Pascarella); 0000-0001-7003-4781 (A. M. Rinaldi); sponses. 0000-0002-8732-1733 (C. Russo); 0000-0002-8176-6950 (C. Sansone); 0000-0001-9763-8745 (C. Tommasino) 2. The multimedia processor (optional) may be Β© 2024 Copyright for this paper by its authors. Use permitted under Creative Commons License required to preprocess voice or video signals and Attribution 4.0 International (CC BY 4.0). CEUR ceur-ws.org Workshop ISSN 1613-0073 Proceedings convert them into text or recognize the user’s model leverages this information to link normalized user tone to facilitate response generation. inputs with the most probable user intent [7]. 3. The multimodal input analysis unit handles classification and data pre-treatment, often us- RL-based chatbots ing natural language understanding (NLU) tech- niques such as semantic parsing, slot filling, and RL-based chatbots adopt reinforcement learning for intent identification. response generation. Reinforcement learning itself is mainly based on the Markov decision process, i.e. a 4- 4. The response generator either associates a tuple (𝑆, 𝐴, π‘ƒπ‘Ž , π‘…π‘Ž ) where: proper response for the given pre-processed input from a stored dataset or, using modern machine β€’ 𝑆 = (𝑠1 , 𝑠2 , ..., 𝑠𝑛 ) is a set of states, called the learning techniques, maps the normalized input state space; to the output using a pre-trained model. β€’ 𝐴 = (π‘Ž1 , π‘Ž2 , ..., π‘Žπ‘š ) is a set of actions, called the The response generator is the core component of a action space; chatbot where the actual question-and-answer process β€’ π‘ƒπ‘Ž (𝑠, 𝑠′ ) = Pr(𝑠𝑑+1 = 𝑠′ |𝑠𝑑 = 𝑠, π‘Žπ‘‘ = π‘Ž) is the takes place, and it can be considered as the "brain" of the probability that action π‘Ž, in the state 𝑠 at step 𝑑 system. Based on the architecture of the response gen- will lead to state 𝑠′ at step 𝑑 + 1; erator, chatbot systems can be classified into two main β€’ π‘…π‘Ž (𝑠, 𝑠′ ) is the reward received after transition- categories: retrieval-based chatbots, which select their ing from state 𝑠 to state 𝑠′ when action π‘Ž is per- responses form a pre-defined set of possible outcomes, formed. and generative-based chatbots, which use ML tech- niques to dynamically generate answers [6]. The goal of a Markov decision process it to find a function πœ‹(𝑠) (generally called policy) that associate, for every state 𝑠𝑖 , the action πœ‹(𝑠𝑑 ) = π‘Žπ‘– which maximizes 2.1. Retrieval-based chatbots the overall reward, i.e. the following expectation value: The goal of retrieval-based chatbots is to "understand" [οΈƒ ∞ ]οΈƒ the user input and choose the most suitable responses βˆ‘οΈ 𝑑 π‘„πœ‹ = 𝐸 𝛾 π‘…πœ‹(𝑠𝑑 ) (𝑠𝑑 , 𝑠𝑑+1 ) (1) from a knowledge dataset. There are four sub-categories 𝑑=0 of retrieval-based chatbots, which can be distinguished based on the architecture of their knowledge dataset and where 𝛾 is a coefficient (the discount factor) between 0 retrieval techniques. These categories are template-based, and 1 [8]. In RL-based chatbots, each state 𝑠𝑖 corresponds corpus-based, intent-based, and RL-based [5]. to a specific turn in the conversation and is usually rep- resented by an embedded vector. After the chatbot is trained, it is able to select the most appropriate response Template-based chatbots (action) π‘Žπ‘– to ensure that the conversation remains rele- Template-based chatbots select responses from a set of vant and coherent [9]. possible candidates by comparing the user input to cer- tain query patterns. 2.2. Generative-based chatbots Corpus-based chatbots Generative-based chatbots have the advantage of being able to generate responses dynamically, which can lead to Although template-based chatbots have shown effective- more natural and flexible conversations with users. Gen- ness in certain cases, their fundamental architecture ne- erative chatbots can generate novel responses, which cessitates scanning through all potential outputs for each means that they are not limited to pre-defined responses input until the appropriate response is located. As a like retrieval-based chatbots. This flexibility allows them result, this approach can be slow and unsuitable for ap- to provide more personalized and relevant responses. plications with a large knowledge dataset. Depending on the machine learning architecture used, we will discuss about RNN-based chatbots and Intent-based chatbots Transformer-based chatbots. Intent-based chatbots utilize machine learning tech- niques to establish a connection between user inputs RNN-based chatbots and pre-defined outputs. Typically, relevant data is col- One commonly used method for developing generation- lected and stored to establish associations between user based chatbots involves the use of two interconnected intents (i.e., the conceptual meaning behind a user’s re- neural networks known as recursive neural networks quest) and appropriate responses. Next, a pre-trained (RNNs). The first network, called the encoder, is trained to associate an input sentence with an intermediate vec- (AI) to streamline and revolutionize complex decision- tor called the context vector. The second network, making processes, augmenting the power of cutting- called the decoder, takes the context vector as input and edge technologies, enhancing the classical Retrieval- is trained to generate an output sentence, either by gen- Augmented Generation (RAG) models. Through a meticu- erating actual words or by using tokens. This approach lous exploration of a multi-query & human centred RAG is commonly referred to as "sequence-to-sequence" or application design, the access and the understanding to Seq2Seq [6, 10]. sophisticated AI capabilities, bridging the gap between As RNN-based chatbot responses are dynamically gen- technical expertise and practical application, is guaran- erated through machine learning models, they may be teed. The culmination of this inquiry comes with a con- less precise and more uncertain than retrieval-based chat- cise and robust architectural flow proposal, laying the bots. For this reason, RNN-based chatbots are less com- groundwork for the seamless integration of multiquery- monly used in task- or knowledge-oriented scenarios and RAG solutions into decision-making processes and offer- are instead more frequently used in entertainment and ing further insights that extends beyond the confines of mental-health-related activities [5]. this study and pave the way for future advancements in the field. Transformer-based chatbots Question Generation Chain The multiquery-RAG A Transformer is a recent type of neural network archi- system distinguishes itself through its ability to generate tecture used for NLU and chatbots. First introduced in multiple variations of the original user query, in a human [11], is also used in other tasks such as language transla- like fashion, through a specialized question generation tion and text summarization. Transformers are based on chain that produces a prefixed number of alternative the self-attention mechanism, which allows the model queries capturing distinct viewpoints and nuances asso- to learn which parts of the input sequence to attend to ciated with the original question. This diversification at each step of processing, based on the relevance of the of the query set, if correctly fine-tuned, plays a pivotal other parts of the sequence to the current position. This role in surmounting the limitations of distance-based is done through a process called scaled dot-product atten- similarity searches in vector databases, ensuring a com- tion, where the model learns a set of weights to compute prehensive and more efficient document retrieval process a weighted sum of the input sequence representations. despite the classical retrieving process. An important language model based on the Transformer architecture is the Generative Pre-trained Trans- former (GPT), which was developed by OpenAI in 2020 Answer Generation Chain Following the retrieval of [12]. GPT serves as the underlying architecture for the information (documents), the system proceeds to gener- ChatGPT chatbot, which has gained widespread recog- ate answers by synthesizing and formulating responses nition for its ability to provide detailed and articulate using the data extracted from the documents and leverag- responses across a variety of domains [13]. ing a wide LLMs systems. Contextualizing and elaborat- ing on those information it ensures that the responses are both accurate and easily understandable for non-experts 3. Multiquery Retrieval facilitating broader accessibility and utilization of the information among a wider audience. Augmented Generation In the actual forefront of Generative Artificial Intelli- 3.2. Evaluation Criteria gence (Gen-AI) streamlining complex decision-making This section outlines the principal metrics [15] that are processes by enabling accessible and comprehensible integral for evaluating a Retrieval-Augmented Genera- tools to all users it is vitally important. The core of this tion (RAG) in measuring different aspects of the system’s section is relative to propose an alternative to the classical performance as presented in figure [1]. RAG, introduced by Lewis et al. in 2021 [14], enhancing its capabilities with a multiquery approach presenting a concise and solid architectural flow along with main Context Precision This metric evaluates the signal-to- evaluation metrics. noise ratio within the retrieved contexts measuring how many of the retrieved documents are actually relevant respect to the user’s query. 3.1. Methodology This methodological section delves into the profound im- Context Recall This metric assesses whether all neces- plications of leveraging Generative Artificial Intelligence sary information required to answer the query has been Recent advancements, however, offer promising solu- tions. [18] and [19] present novel frameworks integrating semantic analysis, deep learning, and NoSQL technolo- gies to extract entities from knowledge corpora, bridging the gap between textual and multimedia sources. Their approaches mark significant strides in enriching KGs with diverse data types, fostering more comprehensive knowledge representation and analysis. Meanwhile, Chen et al. [20] propose a generative ap- proach to the KG population, leveraging machine learn- ing to establish relationships and reduce human inter- vention in the curation process. Training models to learn underlying data distributions and generate triplets re- gardless of entity pair co-occurrence in textual corpora pave the way for more efficient and scalable KG con- struction. This innovative approach streamlines the pop- ulation process and broadens the scope of knowledge capture, enabling KGs to encapsulate a wider array of interconnected concepts and relationships. Manual curation, though traditional, is labor-intensive and impractical in the face of expanding data landscapes Figure 1: RAG Evaluation criterion [21]. To address this, a data-centric architecture harness- ing generative deep-learning models emerges, automat- ing KG creation, particularly for multimedia instances. retrieved ensuring that the system’s knowledge base cov- By synthesizing multimedia data, irrespective of absolute ers all aspects needed to formulate a comprehensive and data scarcity, a dynamic, infinitely expandable pool of accurate response and relying on a comparison between instances is ensured, underpinning model training and in- the retrieved contexts and the ground truths. ference with a multimedia knowledge graph that evolves alongside data trends. Faithfulness This metric quantifies the factual accu- Different knowledge graph population approaches with racy of the answers generated by the RAG system. It in- generative AI are based on standard steps. The first is volves counting the number of correct factual statements grabbing information from curated textual sources. It is made in the generated answers based on the retrieved possible to enrich it by using Linked Open Data (LOD) contexts and comparing this count to the total number and base the image’s generation using the enhanced tex- of statements in the answers. tual description to make the text as complete as possible. The next step combines the previously obtained textual Answer Relevancy This metric measures how well statement and produces a representative multimedia in- the generated answers address the user’s queries. For ex- stance of the input text via a generative text-image syn- ample, if a query asks for multiple pieces of information, thesis model. The last step consists of using a focused the relevancy score reflects how completely the response crawler, which allows a check on the quality of the gener- addresses all elements of the query. ated image, exploiting different metrics useful to measure the degree of similarity of the generated image concern- ing its textual description and real images crawled from 4. Multimedia Knowledge Graph the web. If the image from the previous step exhibits met- ric values that surpass a threshold determined through population using Generative AI experimental evaluation, it can be stored in the node of Knowledge Graphs (KGs) serve as potent repositories, the multimedia knowledge base. adeptly organizing, connecting, and extracting insights In image generation for the knowledge graph population, from many data sources, embodying contemporary text-image synthesis models are developed to bridge the knowledge management principles in semantic web ap- semantic gap between textual descriptions and corre- plications [16]. Despite their invaluable utility, realizing sponding visual representations. These models lever- the full potential of KGs necessitates a systematic pop- age cutting-edge generative strategies to produce high- ulation with relevant information, a task fraught with quality images aligned with the provided textual prompts. challenges, mainly when data is scarce [17]. The application of text-to-image models improved a lot in recent years, migrating from Generate Adversarial Net- work (GAN) to Latent Diffusion Models, such as Stable on creating a concrete sustainable generative model, ad- Diffusion [22]. A latent diffusion model refines a latent dressing crucial issues related to data collection, key representation by applying diffusion steps in the latent model components, and essential additions. One of the space, gradually reducing noise and revealing the desired main goals of the project is to improve model efficiency image. This iterative process involves adding noise and without compromising performance, using techniques updating the latent code. The model implements a de- such as attention and linear layer optimization within the coder network to reconstruct the image from the refined Transformer architecture. Hominis also aims to ensure latent code. the sanitization of public data and develop data collection The evaluation phase of the quality of multimedia in- strategies to capture a wide range of multifaceted data. stances for the KG node is important. The evaluation pro- Additionally, the project involves developing tools for the cess of text-to-image synthesis models involves assessing community to analyze, curate, and critique datasets while their accuracy in converting text inputs into synthetic ensuring fairness, privacy, and legality. The proposed images. methodologies, such as Universal Tokenization, Assisted Some quantitative metrics are used to assess not only the Generation by Recovery (RAG), the use of diffusion to quality of the image about the text but also the degree improve model controllability, and the use of muTransfer of realism in a generated image by comparing it to real technique to optimize hyperparameters and reduce car- images, such as Cosine Similarity, which compares the bon footprint associated with training, all aim to improve feature vectors, calculating the cosine between them, FID the efficiency, sustainability, and fairness of AI models. In (FrechΓ¨t Inception Distance) [23], a numerical value that particular, the approach of unifying data through Univer- quantifies the similarity between the statistical distribu- sal Tokenization can help better manage data diversity, tions of real and generated images computing the FrΓ©chet while RAG can improve model relevance and accuracy, distance between the two distributions, and CLIP score ensuring greater fairness in outcomes. Furthermore, the [24], a metric that understands the relationship between use of diffusion to improve model controllability helps en- images and text, used for evaluate the model’s ability to sure that AI outputs are transparent and understandable. rank images based on their relevance to a given textual Today, attention to sustainable, adaptable, and responsi- description and vice versa. ble AI is crucial to ensure that the benefits of artificial intelligence are evenly distributed and that negative im- pacts, such as the carbon footprint associated with model 5. Ethical and social challenges training, are minimized. In an era where sustainable and responsible AI is essential for our future, projects like The recent advances in generative AI are revolutionizing Hominis represent a step in the right direction, helping many sectors thanks to the ability to create original con- ensure that the benefits of AI are accessible to all while tent based on patterns learned from training data. Models minimizing negative impacts on the environment and such as those based on transformer architectures, have society. already demonstrated significant success in various fields, including natural language processing, computer vision, and reinforcement learning. However, despite the advan- Acknowledgments tages offered by generative models, their development and deployment raise concerns regarding ethical and en- This work was partially supported by PNRR MUR Project vironmental implications. Firstly, these models require PE0000013-FAIR. massive computational resources and consume a large The FAIR project is committed to promoting an advanced amount of energy during both training and execution vision of Artificial Intelligence, driving research and de- processes. 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