What techniques can you use to program realistic AI opponents for esports games?

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Esports games are competitive and challenging, and they require realistic and intelligent AI opponents to keep players engaged and motivated. AI, or artificial intelligence, is the branch of computer science that deals with creating systems that can perform tasks that normally require human cognition, such as decision making, learning, and problem solving. In this article, you will learn about some of the techniques that you can use to program realistic AI opponents for esports games, such as finite state machines, behavior trees, neural networks, and reinforcement learning.

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Arijit Bhattacharyya

Entrepreneur Since 1998 4 Continents | Technologist, Angel Investor | Board member TEDx Speaker | VC, Startup Mentor…

1 Finite State Machines

A finite state machine, or FSM, is a model of computation that consists of a set of states and transitions between them. Each state represents a behavior or an action that the AI can perform, such as idle, patrol, attack, flee, etc. Each transition is triggered by a condition or an event, such as seeing an enemy, taking damage, reaching a destination, etc. An FSM can be implemented using switch statements, enums, or classes in most programming languages. An FSM is easy to understand and debug, but it can become complex and rigid if there are too many states and transitions.

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Arijit Bhattacharyya

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Use Case: For simpler AI logic, such as patrol, attack, and flee behaviors. Description: FSMs involve defining specific states for the AI (e.g., searching, engaging, retreating) and the conditions under which the AI transitions between these states. While FSMs can create predictable AI behaviors, they are a good starting point for structuring AI logic.

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Swapnil S.

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Machine learning is utilized by AI in sports games to analyze gameplay data and develop strategies that look like humans. Dynamic decision-making is created by behavior trees and FSMs, while balancing difficulty ensures a fair challenge. The AI's tactics are further refined by studying professional players. This combination makes esports AI opponents both challenging and realistic.

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2 Behavior Trees

A behavior tree, or BT, is a hierarchical structure that represents the logic and the goals of the AI. Each node in the tree is either a task, a condition, or a control flow. A task is an atomic action that the AI can perform, such as move, shoot, reload, etc. A condition is a boolean expression that evaluates the state of the world or the AI, such as isEnemyVisible, isHealthLow, isAmmoEmpty, etc. A control flow is a node that determines how to execute its child nodes, such as sequence, selector, parallel, etc. A BT can be implemented using custom classes or frameworks in most programming languages. A BT is flexible and modular, but it can become difficult to maintain and test if there are too many nodes and branches.

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Arijit Bhattacharyya

Entrepreneur Since 1998 4 Continents | Technologist, Angel Investor | Board member TEDx Speaker | VC, Startup Mentor, Consultant of Bank | International Speaker | AI, ML, Game, VR, AR, Metaverse, Blockchain, Superhero
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Behavior trees are hierarchical models that structure the decision-making process of AI. They allow for more nuanced and varied behaviors, supporting sequences of actions, conditional behaviors, and prioritization of tasks. This makes AIs more adaptable and their actions more diverse.

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3 Neural Networks

A neural network, or NN, is a mathematical model that mimics the structure and the function of the biological brain. It consists of a network of interconnected units called neurons, which can process and transmit information. Each neuron has a set of inputs, weights, biases, and an activation function that determines its output. A NN can be trained using supervised or unsupervised learning methods to learn patterns and relationships from data. A NN can be implemented using libraries or frameworks such as TensorFlow, PyTorch, or Unity ML-Agents in most programming languages. A NN is powerful and adaptable, but it can be hard to interpret and optimize.

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Arijit Bhattacharyya

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Utility AI evaluates various actions based on a scoring system, where each potential action is scored according to certain criteria (e.g., safety, attack opportunity, resource conservation). The AI then chooses the action with the highest utility. This system allows for decision-making that considers the current context and goals, making AI behavior more dynamic and less predictable.

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4 Reinforcement Learning

Reinforcement learning, or RL, is a type of machine learning that deals with learning from trial and error. It involves an agent, an environment, a policy, a reward, and a value function. The agent is the AI that interacts with the environment, which is the game world. The policy is the strategy that the agent follows to choose its actions. The reward is the feedback that the agent receives from the environment for each action. The value function is the estimation of the future rewards that the agent can expect from each state. The agent can learn its policy and value function using algorithms such as Q-learning, SARSA, or DQN. RL can be implemented using libraries or frameworks such as TensorFlow, PyTorch, or Unity ML-Agents in most programming languages. RL is dynamic and autonomous, but it can be slow and unstable.

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Arijit Bhattacharyya

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ML techniques, including reinforcement learning (RL) and deep neural networks, can be trained on vast amounts of game data or through self-play (as seen with AlphaStar by DeepMind in StarCraft II). These AIs learn strategies, counter-strategies, and nuanced gameplay tactics over time, potentially reaching or surpassing human-level performance in specific aspects of the game.

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5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Arijit Bhattacharyya

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By analyzing player behavior, preferences, and skill levels, AI can be programmed to adapt its strategies dynamically. This could involve changing its level of aggressiveness, defense strategies, or even mimicking player behavior to some extent.

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What techniques can you use to program realistic AI opponents for esports games?

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1 Finite State Machines

2 Behavior Trees

3 Neural Networks

4 Reinforcement Learning

5 Here’s what else to consider

Game Development

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What techniques can you use to program realistic AI opponents for esports games?

1

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1 Finite State Machines

2 Behavior Trees

3 Neural Networks

4 Reinforcement Learning

5 Here’s what else to consider

Game Development

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