Reinforcement learning (RL) is a type of machine learning where an agent learns to make decisions by performing actions in an environment to maximize cumulative reward. Here's a basic overview of its key concepts and components: 1.Agent: The learner or decision-maker. 2.Environment: The external system with which the agent interacts. 3.State (s): A representation of the current situation of the agent. 4.Action (a): The set of all possible moves the agent can make. 5.Reward (r): The feedback from the environment after an action is taken. It can be positive or negative. 6.Policy (π): A strategy used by the agent to determine the next action based on the current state. 7.Value Function (V): A function that estimates the expected cumulative reward from a state, following a certain policy. 8.Q-Function (Q): A function that estimates the expected cumulative reward of taking a given action in a given state, and thereafter following a certain policy. Types of Reinforcement Learning: 1.Model-Free vs. Model-Based: • Model-Free: The agent learns directly from interactions with the environment, without a model of the environment's dynamics (e.g., Q-learning, SARSA). • Model-Based: The agent builds a model of the environment's dynamics and uses it to make decisions (e.g., Dyna-Q). 2.Value-Based vs. Policy-Based: • Value-Based: The agent learns a value function to make decisions (e.g., Q-learning). • Policy-Based: The agent learns a policy directly without using a value function (e.g., REINFORCE algorithm). • Actor-Critic: A hybrid approach where the agent has both a value function (critic) and a policy (actor) (e.g., A3C, DDPG). Key Algorithms: 1.Q-Learning: A model-free algorithm where the agent learns the Q-value of state-action pairs and updates them based on the Bellman equation. 2.SARSA (State-Action-Reward-State-Action): Similar to Q-learning but updates the Q-value using the action actually taken by the policy. 3.Deep Q-Networks (DQN): Combines Q-learning with deep neural networks to handle high-dimensional state spaces. 4.REINFORCE: A policy-based method that updates the policy directly using gradient ascent on expected reward. 5.Actor-Critic Methods: Combines value-based and policy-based methods, where the actor updates the policy and the critic updates the value function. Applications: • Gaming: Achieving superhuman performance in games like Go, Chess, and video games. • Robotics: Teaching robots to perform tasks through trial and error. • Finance: Portfolio management and algorithmic trading. • Healthcare: Personalized treatment plans and drug discovery. • Autonomous Vehicles: Decision-making and navigation in dynamic environments. Challenges: • Exploration vs. Exploitation: Balancing the need to explore new actions to find better rewards and exploiting known actions that give high rewards. • Sample Efficiency: The amount of data required for the agent to learn an effective policy. #ReinforcementLearning #AI
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Reinforcement Learning
Reinforcement learning (RL) is a type of machine learning where an agent learns to make decisions by performing actions in an environment to maximize cumulative reward. Here's a basic overview of its key concepts and components: 1.Agent: The learner or decision-maker. 2.Environment: The external system with which the agent interacts. 3.State (s): A representation of the current situation of the agent. 4.Action (a): The set of all possible moves the agent can make. 5.Reward (r): The feedback from the environment after an action is taken. It can be positive or negative. 6.Policy (π): A strategy used by the agent to determine the next action based on the current state. 7.Value Function (V): A function that estimates the expected cumulative reward from a state, following a certain policy. 8.Q-Function (Q): A function that estimates the expected cumulative reward of taking a given action in a given state, and thereafter following a certain policy. Types of Reinforcement Learning: 1.Model-Free vs. Model-Based: • Model-Free: The agent learns directly from interactions with the environment, without a model of the environment's dynamics (e.g., Q-learning, SARSA). • Model-Based: The agent builds a model of the environment's dynamics and uses it to make decisions (e.g., Dyna-Q). 2.Value-Based vs. Policy-Based: • Value-Based: The agent learns a value function to make decisions (e.g., Q-learning). • Policy-Based: The agent learns a policy directly without using a value function (e.g., REINFORCE algorithm). • Actor-Critic: A hybrid approach where the agent has both a value function (critic) and a policy (actor) (e.g., A3C, DDPG). Key Algorithms: 1.Q-Learning: A model-free algorithm where the agent learns the Q-value of state-action pairs and updates them based on the Bellman equation. 2.SARSA (State-Action-Reward-State-Action): Similar to Q-learning but updates the Q-value using the action actually taken by the policy. 3.Deep Q-Networks (DQN): Combines Q-learning with deep neural networks to handle high-dimensional state spaces. 4.REINFORCE: A policy-based method that updates the policy directly using gradient ascent on expected reward. 5.Actor-Critic Methods: Combines value-based and policy-based methods, where the actor updates the policy and the critic updates the value function. Applications: • Gaming: Achieving superhuman performance in games like Go, Chess, and video games. • Robotics: Teaching robots to perform tasks through trial and error. • Finance: Portfolio management and algorithmic trading. • Healthcare: Personalized treatment plans and drug discovery. • Autonomous Vehicles: Decision-making and navigation in dynamic environments. Challenges: • Exploration vs. Exploitation: Balancing the need to explore new actions to find better rewards and exploiting known actions that give high rewards. • Sample Efficiency: The amount of data required for the agent to learn an effective policy. #ReinforcementLearning #AI
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Reinforcement Learning (RL) is a type of machine learning where an agent learns to make decisions by performing actions in an environment to maximize cumulative rewards. It's inspired by behavioral psychology and is particularly useful for solving problems where the decision-making process is sequential and the outcomes are delayed. Key Concepts in Reinforcement Learning Agent: The learner or decision-maker. Environment: Everything the agent interacts with. State: A representation of the current situation of the agent in the environment. Action: The choices the agent can make. Reward: Feedback from the environment to evaluate the action. Policy: A strategy used by the agent to determine the next action based on the current state. Value Function: A function that estimates the expected reward for being in a given state and/or taking a particular action. Q-Value (Action-Value) Function: A function that represents the expected reward of an action taken in a particular state, following a certain policy. Types of Reinforcement Learning Model-Free RL: The agent learns directly from interactions with the environment without a model of the environment. Common algorithms include: Q-Learning: An off-policy algorithm where the agent learns the value of the optimal policy independently of the actions taken. SARSA (State-Action-Reward-State-Action): An on-policy algorithm where the agent learns the value of the policy being followed. Popular Algorithms Q-Learning: Updates the Q-value based on the Bellman equation: Q(s,a)←Q(s,a)+α[r+γmaxa′Q(s′,a′)−Q(s,a)]Q(s, a) \leftarrow Q(s, a) + \alpha [r + \gamma \max_{a'} Q(s', a') - Q(s, a)]Q(s,a)←Q(s,a)+α[r+γmaxa′Q(s′,a′)−Q(s,a)] where α\alphaα is the learning rate, γ\gammaγ is the discount factor, sss and s′s's′ are the current and next states, and aaa and a′a'a′ are the current and next actions. Deep Q-Networks (DQN): Uses neural networks to approximate the Q-value function, allowing RL to be applied to problems with large state and action spaces. Policy Gradient Methods: Directly optimize the policy by adjusting its parameters using gradient ascent. Common algorithms include: REINFORCE Proximal Policy Optimization (PPO) Trust Region Policy Optimization (TRPO) Applications of Reinforcement Learning Gaming: RL has been successfully applied in training agents to play and win complex games like Chess, Go, and video games. Robotics: RL is used for developing control policies for robots to perform tasks such as navigation and manipulation. Challenges in Reinforcement Learning Exploration vs. Exploitation: Balancing the need to explore new actions to discover their rewards versus exploiting known actions to maximize rewards. Reinforcement Learning is a powerful and versatile approach in machine learning, opening up new possibilities in areas requiring complex decision-making and adaptive behavior.
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Understanding the Basics of Deep Reinforcement Learning https://ift.tt/okEqysQ Understanding the Basics of Deep Reinforcement Learning Deep Reinforcement Learning (DRL) is a powerful approach to artificial intelligence that combines deep learning and reinforcement learning techniques. It has gained significant attention in recent years due to its ability to solve complex problems and achieve human-level performance in various domains, such as game playing, robotics, and autonomous driving. In this article, we will explore the basics of DRL, its key components, and how it works. What is Deep Reinforcement Learning? Reinforcement learning (RL) is a subfield of machine learning that focuses on training agents to make sequential decisions in an environment to maximize a reward signal. The agent interacts with the environment, takes actions, and receives feedback in the form of rewards or penalties. The goal is to learn a policy that maps states to actions, maximizing the cumulative reward over time. Deep learning, on the other hand, is a subset of machine learning that uses artificial neural networks to model and understand complex patterns in data. Deep neural networks, also known as deep models, consist of multiple layers of interconnected nodes that can learn hierarchical representations of data. Deep Reinforcement Learning combines these two approaches by using deep neural networks as function approximators to represent the policy or value functions in RL. This allows the agent to handle high-dimensional input spaces and learn complex decision-making strategies. Key Components of Deep Reinforcement Learning: 1. Agent: The agent is the learner or decision-maker in the RL framework. It interacts with the environment, observes states, takes actions, and receives rewards. 2. Environment: The environment is the external system in which the agent operates. It provides the agent with observations, and the agent’s actions affect the environment’s state. 3. State: The state represents the current situation or configuration of the environment. It is an input to the agent’s decision-making process and can be a raw sensory input or a processed representation. 4. Action: An action is a decision made by the agent based on its current state. It affects the environment’s state and determines the agent’s future observations and rewards. 5. Reward: The reward is a scalar feedback signal that the agent receives from the environment after taking an action. It indicates the desirability or quality of the agent’s actions. 6. Policy: The policy is the strategy or rule that the agent follows to select actions in a given state. It maps states to actions and can be deterministic or stochastic. 7. Value Function: The value function estimates the expected cumulative reward that an agent can achieve from a given state or state-action pair. It helps the agent evaluate the desirability of different states or actions. How Deep Reinforcement Learning Wor...
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Understanding the Basics of Deep Reinforcement Learning Deep Reinforcement Learning - DRL - is a powerful approach to artificial intelligence that combines deep learning and reinforcement learning techniques. It has gained significant attention in recent years due to its ability to solve complex problems and achieve human-level performance in various domains, such as game playing, robotics, and autonomous driving. In this article, we will explore the basics of DRL, its key components, and how it works. What is Deep Reinforcement Learning? Reinforcement learning - RL - is a subfield of machine learning that focuses on training agents to make sequential decisions in an environment to maximize a reward signal. The agent interacts with the environment, takes actions, and receives feedback in the form of rewards or penalties. The goal is to learn a policy that maps states to actions, maximizing the cumulative reward over time. Deep learning, on the other hand, is a subset of machine learning that uses artificial neural networks to model and understand complex patterns in data. Deep neural networks, also known as deep models, consist of multiple layers of interconnected nodes that can learn hierarchical representations of data. Deep Reinforcement Learning combines these two approaches by using deep neural networks as function approximators to represent the policy or value functions in RL. This allows the agent to handle high-dimensional input spaces and learn complex decision-making strategies. Key Components of Deep Reinforcement Learning: 1. Agent: The agent is the learner or decision-maker in the RL framework. It interacts with the environment, observes states, takes actions, and receives rewards. 2. Environment: The environment is the external system in which the agent operates. It provides the agent with observations, and the agent's actions affect the environment's state. 3. State: The state represents the current situation or configuration of the environment. It is an input to the agent's decision-making process and can be a raw sensory input or a processed representation. 4. Action: An action is a decision made by the agent based on its current state. It affects the environment's state and determines the agent's future observations and rewards. 5. Reward: The reward is a scalar feedback signal that the agent receives from the environment after taking an action. It indicates the desirability or quality of the agent's actions. 6. Policy: The policy is the strategy or rule that the agent follows to select actions in a given state. It maps states to actions and can be deterministic or stochastic. 7. Value Function: The value function estimates the expected cumulative reward that an agent can achieve from a given state or state-action pair. It helps the agent evaluate the desirability of different states or actions. How Deep Reinforcement Learning Works: 1. Data Collection: The agent interacts with the environment, collecting data in
Understanding the Basics of Deep Reinforcement Learning
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📈💡 Delighted to delve deeper into "Deep Reinforcement Learning for High-Frequency Market Making" by Pankaj Kumar! Let's explore the paper further: 💻 𝐃𝐞𝐞𝐩 𝐑𝐞𝐢𝐧𝐟𝐨𝐫𝐜𝐞𝐦𝐞𝐧𝐭 𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 𝐁𝐚𝐜𝐤𝐠𝐫𝐨𝐮𝐧𝐝: In the realm of machine learning, reinforcement learning (RL) serves as a paradigm where an agent learns to make optimal decisions by interacting with an environment and receiving rewards or penalties based on its actions. Specifically, the paper focuses on the 𝐇𝐃𝐞𝐞𝐩 𝐑𝐞𝐜𝐮𝐫𝐫𝐞𝐧𝐭 𝐐-𝐍𝐞𝐭𝐰𝐨𝐫𝐤 (𝐃𝐑𝐐𝐍) 𝐚𝐥𝐠𝐨𝐫𝐢𝐭𝐡𝐦, an extension of the 𝐃𝐞𝐞𝐩 𝐐-𝐍𝐞𝐭𝐰𝐨𝐫𝐤 (𝐃𝐐𝐍) tailored to handle partially observable Markov decision processes with sequential data. DRQNs leverage recurrent neural networks, such as 𝐋𝐨𝐧𝐠 𝐒𝐡𝐨𝐫𝐭-𝐓𝐞𝐫𝐦 𝐌𝐞𝐦𝐨𝐫𝐲 (𝐋𝐒𝐓𝐌), to capture long-term dependencies in the data and estimate optimal Q-values for each state-action pair. 📊 𝐌𝐚𝐫𝐤𝐞𝐭 𝐒𝐢𝐦𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐄𝐧𝐯𝐢𝐫𝐨𝐧𝐦𝐞𝐧𝐭: To facilitate the training and evaluation of the DRL agent, the authors develop a simulation environment mimicking a limit order book (LOB) market. The LOB, a crucial component in financial markets, aggregates outstanding buy and sell orders for an asset, ultimately determining the best bid and ask prices. The simulation meticulously models the arrival of new market orders, limit orders, and order cancellations using statistical distributions calibrated from real market data. Moreover, it incorporates vital market microstructure features such as trade fees, inventory penalties, and order book clearing mechanisms. 🤖 Deep Reinforcement Learning Agent: The DRL agent deployed in this framework utilizes a DRQN architecture to learn the optimal quoting policy. The neural network's input comprises the current state of the LOB, the agent's inventory position, and other pertinent features. Subsequently, the network outputs the estimated Q-value for each potential action, which encompasses adjustments to bid and ask prices. Training the agent entails employing Q-learning, an off-policy RL algorithm that iteratively updates Q-value estimates towards the expected long-term discounted reward. To stabilize the training process, the authors leverage techniques like experience replay and target network updates. 🔍 Experiments and Results: The paper extensively evaluates the DRL agent's performance through a series of experiments, comparing it against a prominent benchmark strategy known as 𝐓𝐞𝐦𝐩𝐨𝐫𝐚𝐥 𝐃𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐜𝐞 𝐑𝐞𝐢𝐧𝐟𝐨𝐫𝐜𝐞𝐦𝐞𝐧𝐭 𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 (𝐓𝐃𝐑𝐋). These experiments are conducted across various market environments exhibiting different levels of volatility, trade arrival rates, and order book dynamics. Additionally, the authors explore the ramifications of multiple DRL agents interacting within the same market on metrics such as bid-ask spreads, trade volumes, and price volatility. Link : https://lnkd.in/evBf4qAQ
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Understanding the Basics of Deep Reinforcement Learning Deep Reinforcement Learning - DRL - is a powerful approach to artificial intelligence that combines deep learning and reinforcement learning techniques. It has gained significant attention in recent years due to its ability to solve complex problems and achieve human-level performance in various domains, such as game playing, robotics, and autonomous driving. In this article, we will explore the basics of DRL, its key components, and how it works. What is Deep Reinforcement Learning? Reinforcement learning - RL - is a subfield of machine learning that focuses on training agents to make sequential decisions in an environment to maximize a reward signal. The agent interacts with the environment, takes actions, and receives feedback in the form of rewards or penalties. The goal is to learn a policy that maps states to actions, maximizing the cumulative reward over time. Deep learning, on the other hand, is a subset of machine learning that uses artificial neural networks to model and understand complex patterns in data. Deep neural networks, also known as deep models, consist of multiple layers of interconnected nodes that can learn hierarchical representations of data. Deep Reinforcement Learning combines these two approaches by using deep neural networks as function approximators to represent the policy or value functions in RL. This allows the agent to handle high-dimensional input spaces and learn complex decision-making strategies. Key Components of Deep Reinforcement Learning: 1. Agent: The agent is the learner or decision-maker in the RL framework. It interacts with the environment, observes states, takes actions, and receives rewards. 2. Environment: The environment is the external system in which the agent operates. It provides the agent with observations, and the agent's actions affect the environment's state. 3. State: The state represents the current situation or configuration of the environment. It is an input to the agent's decision-making process and can be a raw sensory input or a processed representation. 4. Action: An action is a decision made by the agent based on its current state. It affects the environment's state and determines the agent's future observations and rewards. 5. Reward: The reward is a scalar feedback signal that the agent receives from the environment after taking an action. It indicates the desirability or quality of the agent's actions. 6. Policy: The policy is the strategy or rule that the agent follows to select actions in a given state. It maps states to actions and can be deterministic or stochastic. 7. Value Function: The value function estimates the expected cumulative reward that an agent can achieve from a given state or state-action pair. It helps the agent evaluate the desirability of different states or actions. How Deep Reinforcement Learning Works: 1. Data Collection: The agent interacts with the environment, collecting data in
Understanding the Basics of Deep Reinforcement Learning
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Question: 53 What is deep Q-learning in reinforcement learning, and how does it work? How does deep Q-learning improve upon traditional Q-learning, and what are the challenges and considerations when using deep Q-learning? Visualization: Create a diagram illustrating the architecture of a deep Q-learning network. Answer: In interviews at major tech companies like Amazon or Facebook, understanding deep Q-learning in reinforcement learning is crucial. Deep Q-learning is a variant of Q-learning that uses a deep neural network to approximate the Q-value function. Visualize this as using a neural network to estimate the Q-values for each action in a given state. Deep Q-learning improves upon traditional Q-learning by: - Handling Complex State Spaces: Deep Q-learning can handle high-dimensional or continuous state spaces. - Generalization: The neural network can generalize across similar states, leading to more efficient learning. - Better Performance: Deep Q-learning can achieve better performance on complex tasks compared to traditional Q-learning. Challenges and considerations when using deep Q-learning include: - Overestimation Bias: Deep Q-learning is prone to overestimating Q-values, which can lead to suboptimal policies. - Exploration vs. Exploitation: Balancing exploration and exploitation is crucial, as the neural network may not explore enough to discover the optimal policy. - Sample Efficiency: Deep Q-learning may require a large number of samples to learn an effective policy, making it computationally expensive. Tips for Preparation: 1. Deep Q-learning Basics: Understand the concept of deep Q-learning and how it uses a neural network to approximate the Q-value function. 2. Architecture: Learn about the architecture of a deep Q-learning network, including input representation, hidden layers, and output layer. 3. Challenges: Understand the challenges and considerations when using deep Q-learning, such as overestimation bias and sample efficiency. 4. Applications: Learn about real-world applications of deep Q-learning, such as game playing and robotic control. 5. Visualization: Create a diagram to illustrate the architecture of a deep Q-learning network.
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Understanding the Basics of Deep Reinforcement Learning Deep Reinforcement Learning - DRL - is a powerful approach to artificial intelligence that combines deep learning and reinforcement learning techniques. It has gained significant attention in recent years due to its ability to solve complex problems and achieve human-level performance in various domains, such as game playing, robotics, and autonomous driving. In this article, we will explore the basics of DRL, its key components, and how it works. What is Deep Reinforcement Learning? Reinforcement learning - RL - is a subfield of machine learning that focuses on training agents to make sequential decisions in an environment to maximize a reward signal. The agent interacts with the environment, takes actions, and receives feedback in the form of rewards or penalties. The goal is to learn a policy that maps states to actions, maximizing the cumulative reward over time. Deep learning, on the other hand, is a subset of machine learning that uses artificial neural networks to model and understand complex patterns in data. Deep neural networks, also known as deep models, consist of multiple layers of interconnected nodes that can learn hierarchical representations of data. Deep Reinforcement Learning combines these two approaches by using deep neural networks as function approximators to represent the policy or value functions in RL. This allows the agent to handle high-dimensional input spaces and learn complex decision-making strategies. Key Components of Deep Reinforcement Learning: 1. Agent: The agent is the learner or decision-maker in the RL framework. It interacts with the environment, observes states, takes actions, and receives rewards. 2. Environment: The environment is the external system in which the agent operates. It provides the agent with observations, and the agent's actions affect the environment's state. 3. State: The state represents the current situation or configuration of the environment. It is an input to the agent's decision-making process and can be a raw sensory input or a processed representation. 4. Action: An action is a decision made by the agent based on its current state. It affects the environment's state and determines the agent's future observations and rewards. 5. Reward: The reward is a scalar feedback signal that the agent receives from the environment after taking an action. It indicates the desirability or quality of the agent's actions. 6. Policy: The policy is the strategy or rule that the agent follows to select actions in a given state. It maps states to actions and can be deterministic or stochastic. 7. Value Function: The value function estimates the expected cumulative reward that an agent can achieve from a given state or state-action pair. It helps the agent evaluate the desirability of different states or actions. How Deep Reinforcement Learning Works: 1. Data Collection: The agent interacts with the environment, collecting data in
Understanding the Basics of Deep Reinforcement Learning
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Deep Learning: The Game-Changer in Supply Chain Optimization Introduction: Supply chain optimization is a critical aspect of any business, as it involves managing the flow of goods and services from the point of origin to the point of consumption. It encompasses various processes such as procurement, production, inventory management, and distribution. Traditionally, supply chain optimization relied on manual processes and rule-based algorithms, which often led to inefficiencies and suboptimal outcomes. However, with the advent of deep learning, a subset of artificial intelligence - AI -, supply chain optimization has been revolutionized. In this article, we will explore how deep learning is transforming the supply chain industry and why it is considered a game-changer. Understanding Deep Learning: Deep learning is a branch of machine learning that focuses on training artificial neural networks to learn and make decisions without explicit programming. It is inspired by the structure and function of the human brain, where interconnected layers of artificial neurons process and analyze data. Deep learning algorithms are capable of automatically learning hierarchical representations of data, enabling them to extract complex patterns and make accurate predictions. Deep Learning in Supply Chain Optimization: Supply chain optimization involves making decisions regarding inventory levels, transportation routes, production schedules, and demand forecasting. These decisions are often influenced by a multitude of factors, including historical data, market trends, and external events. Deep learning algorithms excel at analyzing large volumes of data and identifying hidden patterns, making them ideal for supply chain optimization tasks. Demand Forecasting: Accurate demand forecasting is crucial for supply chain optimization, as it helps businesses align their production and inventory levels with customer demand. Deep learning models can analyze historical sales data, market trends, and external factors such as weather conditions or social media sentiment to predict future demand accurately. By leveraging deep learning, businesses can optimize their inventory levels, reduce stockouts, and minimize excess inventory, leading to cost savings and improved customer satisfaction. Inventory Management: Optimizing inventory levels is a challenging task, as businesses need to balance the costs associated with carrying excess inventory against the risks of stockouts. Deep learning algorithms can analyze historical sales data, supplier lead times, and other relevant factors to determine the optimal inventory levels for each product. By accurately predicting demand and considering various constraints, such as storage capacity or production lead times, deep learning models can help businesses reduce carrying costs while ensuring product availability. Transportation Optimization: Efficient transportation is a critical aspect of supply chain optimization, as it d
Deep Learning: The Game-Changer in Supply Chain Optimization
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If you are a beginner to AI and are facing difficulties understanding concepts like Reinforcement Learning, Markov Decision Process, Discounted Future Reward, Q-Learning, Deep Q Network, and Exploration-Exploitation, this post will help you a lot.
Demystifying Deep Reinforcement Learning
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2wVery helpful!