Contents

- 1 What is exploration strategy?
- 2 Can policy gradient methods be used with discrete action spaces?
- 3 What is difference between exploration and exploitation?
- 4 Does exploration lead to exploitation?
- 5 What is deep deterministic policy gradient?
- 6 Is policy gradient model free?
- 7 What do you call a deterministic policy gradient?
- 8 How is policy gradient used in reinforcement learning?

## What is exploration strategy?

1. The company deliberately is developing or acquiring new to the organization knowledge. Such knowledge can be either complementary to or destroying of its currently utilized knowledge-base.

**Why exploration is important in reinforcement learning?**

A classical approach to any reinforcement learning (RL) problem is to explore and to exploit. Explore the most rewarding way that reaches the target and keep on exploiting a certain action; exploration is hard. Without proper reward functions, the algorithms can end up chasing their own tails to eternity.

### Can policy gradient methods be used with discrete action spaces?

Under the setting of high-dimensional discrete action space, policy-gradient based algorithms can still be applied if we assume the joint distribution over discrete actions to be factorized across dimensions, so that the joint policy is still tractable [Jaśkowski et al., 2018, Andrychowicz et al., 2018].

**What is a policy gradient method?**

Policy gradient methods are a type of reinforcement learning techniques that rely upon optimizing parametrized policies with respect to the expected return (long-term cumulative reward) by gradient descent.

#### What is difference between exploration and exploitation?

Exploration means that you search over the whole sample space (exploring the sample space) while exploitation means that you are exploiting the promising areas found when you did the exploration.

**Why balancing exploration and exploitation is difficult?**

However, balancing exploration and exploitation is extremely difficult to do. This is because they each require different structures, processes, mindsets and skills. Therefore, this balance needs to be conscious and structured around two distinct orientations: one for exploration and one for exploitation.

## Does exploration lead to exploitation?

All Answers (36) Exploration means that you search over the whole sample space (exploring the sample space) while exploitation means that you are exploiting the promising areas found when you did the exploration.

**What is regret reinforcement learning?**

Mathematically speaking, the regret is expressed as the difference between the payoff (reward or return) of a possible action and the payoff of the action that has been actually taken. If we denote the payoff function as u the formula becomes: regret = u(possible action) – u(action taken)

### What is deep deterministic policy gradient?

Deep Deterministic Policy Gradient (DDPG) is a model-free off-policy algorithm for learning continous actions. It uses Experience Replay and slow-learning target networks from DQN, and it is based on DPG, which can operate over continuous action spaces.

**What is a continuous action space?**

In a continuous action space, your agent must output some real-valued number, possibly in multiple dimensions. A good example is the MountianCar problem where you must output the force to apply as a real number.

#### Is policy gradient model free?

1 Answer. Policy Gradient algorithms are model-free. In model-based algorithms, the agent has access to or learns the environment’s transition function, F(state, action) = reward, next_state.

**How are policy gradient algorithms used in economics?**

The policy gradient methods target at modeling and optimizing the policy directly. The policy is usually modeled with a parameterized function respect to θ, πθ(a | s). The value of the reward (objective) function depends on this policy and then various algorithms can be applied to optimize θ for the best reward.

## What do you call a deterministic policy gradient?

Deterministic policy; we can also label this as π(s), but using a different letter gives better distinction so that we can easily tell when the policy is stochastic or deterministic without further explanation. Either π or μ is what a reinforcement learning algorithm aims to learn.

**How is the exploration method used in ddpg?**

A common practice of exploration in DDPG is to add a uncorrelated Gaussian or a correlated Ornstein-Uhlenbeck (OU) process (Uhlenbeck & Ornstein, 1993) to the action selected by the deterministic policy. The data collected by this exploration method is then added to a replay buffer used for DDPG training.

### How is policy gradient used in reinforcement learning?

What is Policy Gradient. Policy gradient is an approach to solve reinforcement learning problems. If you haven’t looked into the field of reinforcement learning, please first read the section “A (Long) Peek into Reinforcement Learning » Key Concepts” for the problem definition and key concepts.