( 2018), strong assumptions on dynamics and initial control policies are required to give theoretical guarantees of safety. 2014) and partially-known control-affine dynamics with Lipschitz regularity conditions are assumed. For example, safety defined by constraining trajectories to safe regions of the state-action space is studied in (Akametalu et al. The latter generally requires assumptions to be made about the dynamics of the system as well as starting conditions (such as access to a safe initial policy).

To elaborate further on the issue of safety, there is a distinction to be made between requiring that a controlling agent/policy is safe (however that may be defined), and requiring that the learning process itself is safe. Thus, taken together, the need for RL algorithms to integrate safety and sample-efficiency into a single coherent framework for real-world settings becomes clear. A safety constraint can be integrated into the control optimisation formulation by quantifying the risk of safety violation by encoding a formal risk measure over the sequence of states (distance, velocity, acceleration, etc.), and actions (actuator control signals). For example, in autonomous drone navigation, one may desire to avoid sharp manoeuvres in cluttered environments, especially where there are people. These can often be formalised through constraints on system trajectories (sequences of state and action pairs). Additionally, there are often important safety considerations that one would like to integrate into the behaviour of the system. However, on the time scales of physical (i.e., real-world) systems, sample-efficiency naturally becomes a more pressing concern due to time and cost burdens. Though successful, these applications assume idealised simulators and require tens of millions of agent-environment interactions, typically performed by randomly exploring policies.

2015), and control of simulated robots (Ammar et al.

If you choose to do business with this business, please let the business know that you contacted BBB for a BBB Business Profile.Īs a matter of policy, BBB does not endorse any product, service or business.Reinforcement learning (RL) has seen successes in many problems such as video and board games (Mnih et al. BBB Business Profiles are subject to change at any time. When considering complaint information, please take into account the company's size and volume of transactions, and understand that the nature of complaints and a firm's responses to them are often more important than the number of complaints.īBB Business Profiles generally cover a three-year reporting period. However, BBB does not verify the accuracy of information provided by third parties, and does not guarantee the accuracy of any information in Business Profiles. BBB asks third parties who publish complaints, reviews and/or responses on this website to affirm that the information provided is accurate. They would totally have a negative number if I could do it!!!!īBB Business Profiles may not be reproduced for sales or promotional purposes.īBB Business Profiles are provided solely to assist you in exercising your own best judgment. They do not even deserve the one star, but you have to give them at least that so you can leave a review.

As you can see by the responses they have given to other customers below and the fact they start the same and the most current one took Samba over a month to respond to just shows how this company works. I just wish there was a better way to get this information out to more businesses, so they do not make the same mistake we did by going with this company. They do not have a customer service department what so ever! We have contacted via email and even the phone number (which no one answers) given to ** via said email and still no response from this HORRIBLE company!!! Seeing all of the other reviews, just confirms that moving to another provider is the best course of action. Do not do business with this company! They have gone totally online only using email as their only form of communication and they do not respond to it either.

Samba safety check