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Agent-Based Players for a First-Person Entertainment-Based Real-Time Artificial Environment

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Agent-Based Players for a First-Person Entertainment-Based Real-Time Artificial Environment Agent-based Players for a First-person Entertainment-based Real-time Artificial Environment G. Michael Youngblood and Lawrence B. Holder Department of Computer Science & Engineering The University of Texas at Arlington Arlington, Texas 76019-0015 {youngbld, holder}@cse.uta.edu Abstract advanced artificial intelligence (AI) engines in electronic The necessity for improved players and opponents in first- entertainment. person entertainment-based real-time artificial environments Artificial intelligence engines, providing compellingly has inspired our research into artificial game players. We intelligent opponents and fertile grounds for the learning employed the approach of creating agent-based players, one single player, can leverage advanced AI techniques and using simple reflex-action based components and another systems to play in these environments. based on a back propagation neural network, to interact in a This paper will examine a reflex-agent based system and modified Quake II environment. Our evaluation of these a back propagation neural network (BPNN) agent based agents utilizes two metrics, a statistical measure and graph system playing in a first-person entertainment-based real- similarity based on clustering from player performance time artificial environment—Id Software’s Quake II game traces against interactive feature points in the environments—both comparing the agents to a sample of 20 environment. Related work will be briefly presented and human players. The reflex-based agent was able to complete followed by a discussion of the design of the two systems 29 of 100 test levels with 73.1% within statistical human- under research. Section 4 will discuss the setup of the performance levels and 15.4% similar to the human players, player environment and the evaluation metrics followed by while the BPNN-based agent was unable to complete any a description of the testing of the two systems. The levels. These results, including some additional findings that findings are then presented from this testing and reveal the potential for a combinational approach, are conclusions are drawn. The paper ends with the future inspiring an architectural vision of a multi-agent system to direction of this work. provide an advanced artificial intelligence engine for the embodiment of advanced artificial characters in gaming and simulation domains. Related Work The Soarbot Project also uses the Quake 2 engine, as well Introduction as the Unreal Tournament and Descent 3 game engines, Computer-based interactive entertainment programs are and couples it to the Soar inference engine for creating an growing in use and popularity. The interactive Autonomous Intelligent Platform (AIP) of Soar agents that entertainment industry currently grosses $9.4 billion will compete against and cooperate with humans and other dollars a year (E3 2002). Despite its size as an industry, Soar agents in the game environment. The Soarbot project there are still many growth areas. In particular, the has been prominent in many recent publications (Laird community of users has identified a few emerging needs: 2000, 2001). 1) the need for improved intelligence in opposing and Gal A. Kaminka et al. (2002) have developed a virtual supporting characters and 2) the desire for better single reality platform based on Unreal Tournament (UT). player experiences (Cass 2002). Current mechanisms for GameBots is composed of a socket-based API imitating intelligence involve the use of finite state communication extension to UT, that allows agents to machines, path planning, and other simple algorithms. participate in the environment, and a development tool set Advanced character intelligence is becoming a much that includes replacement graphics and starter sample code. sought after feature and selling point for games (e.g., Black GameBots replaces the gore of UT with male and female & White) (Cass 2002). There is an inherent need for wizards that utilize a wide range of magical wands that shoot bubbles or green slime, but the goal is still to inflict this magic on other players, preferably of the other team. Copyright © 2004, American Association for Artificial Intelligence (www.aaai.org). All rights reserved. The project hosts tournaments for agents and posts the results that can be viewed on their website. Other work in this area includes many of the developed order to perform adequately or as designed (e.g., the game bots for first-person shooter (FPS) games. Neural memory model is just a storage model, but it may not be networks (NN) are very widely used and research useful without a perceptual model to supply information to involving their use in robotic and classic games (e.g., store or a learning model to form higher-level knowledge robotic soccer, chess) are publicly available. The gaming for storage). AI community also has online tutorials specifically for The DCA is an architecture consisting of basic model using NNs in FPS games (Champandard 2003). types that may exist in multiple forms (with the exception of the attention model provided by CAMS) that comprise the nodes of a connected, directed graph. Multi-agent System Players In this phase of our research, we have focused on creating a base reflex agent utilizing the subsumption Interfacing with the Quake II engine proved to be a architecture (Brooks 1986). To facilitate a basic agent challenge due to intolerance of the game engine for time system, the basic nodes that exist in the current DCA are lags. A design decision was made to make the AI engine be the action, attention (provided by CAMS), effector, completely separate from the game. Having enough memory, percept, and reflex. Figure 1 shows the processor power to not interfere with the demands of the configuration of the DCA reflex-based agent—the arrows game created a problem that was solved by distributing the in the figure represent lines of communication. system between two machines. Furthermore, there was a desire to make every component of a system be independent and swappable with different components (agents) that may provide improved and different capabilities. It is envisioned that these agents, each performing a specific task, would create a connectionist network. Thus, a multi-agent system (MAS) approach was taken. CAMS The Cognitive-based Agent Management System (CAMS) architecture was designed to meet the requirements of a multi-agent system (MAS) for creating a game-playing AI engine. Due to moving towards a cognitive basis for this work, the real-time requirements for interaction with Quake II, and the speed and object-oriented methodology of C++, there was a need for a custom MAS since no current systems offered a usable solution. Figure 1. DCA Reflex-based Agent Configuration The CAMS infrastructure provides an agent framework for agent implementation that focuses on the management The perceptual input node brings in all information from interface to an agent, an attention agent that acts as the single or various sources into the architecture. Any local agent society supervisor, and a bootstrap agent that preprocessing of information is done in the perceptual facilitates the movement (starting and restarting of agents) input (e.g., data conversions, data expansions, spatial on different machines. representation). In the Quake II environment, percepts The CAMS attention agent has the ability to control the include all of the information coming from the game agents within its agent society, change their priority levels, engine for the player (e.g., position, health, inventory, etc.). control their communication links to other agents, and The memory model node receives the perceptual establish anytime processing constraints. information and stores it into short-term memory (STM) for access by all nodes. The memory model may then DCA Reflex-based Agent commit some information to long-term memory or perform other actions. We currently have only established the use The invention and development of CAMS set the stage for of STM which currently acts only as percept data storage the creation of agents to populate a system for playing for agent access. Quake II. Using the human player as a model we intend to Upon the receipt of percepts and storage into memory employ work from human cognitive research to form an for availability to all nodes, the functional nodes that watch agent society into the D’Artagnan Cognitive Architecture and wait for new information in memory start processing. (DCA, named after Dumas’ hero in The Three Musketeers). The reflex agent, which uses subsumption architecture, The DCA consists of distinct areas of focus or models of provides a reactive action to the action agent. The action cognition centered on a specific task that when connected agent determines the best action to take at any given form an architectural system for interacting in an moment based on the input. In our reflex-based model this environment. Each model is independent and should work will merely echo the reflex action. on its own, but may require help from the other models in The reflex agent’s subsumption architecture contained The BPNN implementation specifically employs the use several behavior layers. This agent did maintain a small of a logistic function as the node transfer function between amount of state information, so was not purely reactive, but both hidden and output layers. For this work, the bias term generated some internal sensory information such as is set to zero, and the momentum term is set to one. Due to whether or not it had been stuck in the same position for a well-documented reasons of the feasibility of the network while. At the lowest level the agent would perform a to approach the limit of a one or zero value in application random motion movement with a preference to move (Levine 2000; Rumelhart, Hinton, and Williams 1986), we forward and rotate left on its axis. If the agent was close to consider anything over 0.9 to be 1 and anything less than a goal it was provided positional data and could then sense 0.1 to be 0.
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