Dialogue systems, also called chatbots, are now used in a wide range of applications. However, they still have some major weaknesses. One key weakness is that they are typically trained from manually-labeled data and/or written with handcrafted rules, and their knowledge bases (KBs) are also compiled by human experts. Due to the huge amount of manual effort involved, they are difficult to scale and also tend to produce many errors ought to their limited ability to understand natural language and the limited knowledge in their KBs. Thus, the level of user satisfactory is often low. In this paper, we propose to dramatically improve this situation by endowing the system the ability to continually learn (1) new world knowledge, (2) new language expressions to ground them to actions, and (3) new conversational skills, during conversation or "on the job" by themselves so that as the systems chat more and more with users, they become more and more knowledgeable and are better and better able to understand diverse natural language expressions and improve their conversational skills. A key approach to achieving these is to exploit the multi-user environment of such systems to self-learn through interactions with users via verb and non-verb means. The paper discusses not only key challenges and promising directions to learn from users during conversation but also how to ensure the correctness of the learned knowledge.

Sign language visual recognition from continuous multi-modal streams is still one of the most challenging fields. Recent advances in human actions recognition are exploiting the ascension of GPU-based learning from massive data, and are getting closer to human-like performances. They are then prone to creating interactive services for the deaf and hearing-impaired communities. A population that is expected to grow considerably in the years to come. This paper aims at reviewing the human actions recognition literature with the sign-language visual understanding as a scope. The methods analyzed will be mainly organized according to the different types of unimodal inputs exploited, their relative multi-modal combinations and pipeline steps. In each section, we will detail and compare the related datasets, approaches then distinguish the still open contribution paths suitable for the creation of sign language related services. Special attention will be paid to the approaches and commercial solutions handling facial expressions and continuous signing.

However, the performance of AL heuristics depends on the structure of the underlying classifier model and the data. We propose an imitation learning scheme that imitates the selection of the best expert heuristic at each stage of the AL cycle in a batch-mode pool-based setting. With multiple AL heuristics as experts, the policy is able to reflect the choices of the best AL heuristics given the current state of the AL process. Our experiment on well-known datasets show that we both outperform state of the art imitation learners and heuristics. The high performance of deep learning on various tasks from computer vision (Voulodimos et al., 2018) to natural language processing (NLP) (Barrault et al., 2019) also comes with disadvantages. One of their main drawbacks is the large amount of labeled training data they require. Obtaining such data is expensive and time-consuming and often requires domain expertise (Löffler et al., 2020). Active Learning (AL) is an iterative process where during every iteration an oracle (e.g. a human) is asked to label the most informative unlabeled data sample(s). In pool-based AL all data samples are available (while most of them are unlabeled). In batch-mode pool-based AL, we select unlabeled data samples from the pool in acquisition batches greater than 1. Batch-mode AL decreases the number of AL iterations required and makes it easier for an oracle to label the data samples (Settles, 2009).

The network embedding problem that maps nodes in a graph to vectors in Euclidean space can be very useful for addressing several important tasks on a graph. Recently, graph neural networks (GNNs) have been proposed for solving such a problem. However, most embedding algorithms and GNNs are difficult to interpret and do not scale well to handle millions of nodes. In this paper, we tackle the problem from a new perspective based on the equivalence of three constrained optimization problems: the network embedding problem, the trace maximization problem of the modularity matrix in a sampled graph, and the matrix factorization problem of the modularity matrix in a sampled graph. The optimal solutions to these three problems are the dominant eigenvectors of the modularity matrix. We proposed two algorithms that belong to a special class of graph convolutional networks (GCNs) for solving these problems: (i) Clustering As Feature Embedding GCN (CAFE-GCN) and (ii) sphere-GCN. Both algorithms are stable trace maximization algorithms, and they yield good approximations of dominant eigenvectors. Moreover, there are linear-time implementations for sparse graphs. In addition to solving the network embedding problem, both proposed GCNs are capable of performing dimensionality reduction. Various experiments are conducted to evaluate our proposed GCNs and show that our proposed GCNs outperform almost all the baseline methods. Moreover, CAFE-GCN could be benefited from the labeled data and have tremendous improvements in various performance metrics.

Reinforcement Learning (RL) is an effective tool for controller design but can struggle with issues of robustness, failing catastrophically when the underlying system dynamics are perturbed. The Robust RL formulation tackles this by adding worst-case adversarial noise to the dynamics and constructing the noise distribution as the solution to a zero-sum minimax game. However, existing work on learning solutions to the Robust RL formulation has primarily focused on training a single RL agent against a single adversary. In this work, we demonstrate that using a single adversary does not consistently yield robustness to dynamics variations under standard parametrizations of the adversary; the resulting policy is highly exploitable by new adversaries. We propose a population-based augmentation to the Robust RL formulation in which we randomly initialize a population of adversaries and sample from the population uniformly during training. We empirically validate across robotics benchmarks that the use of an adversarial population results in a more robust policy that also improves out-of-distribution generalization. Finally, we demonstrate that this approach provides comparable robustness and generalization as domain randomization on these benchmarks while avoiding a ubiquitous domain randomization failure mode.

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New Delhi: As Alexa in Hindi celebrates its first anniversary in India, the company is hopeful that her knowledge graph will improve and it will talk to millons of people in several regional languages in the near future. Today, users from India make hundreds of thousands of requests in a day to Alexa in Hindi and Hinglish. "I can't speculate on our future roadmap but I can tell you the Alexa service is getting smarter every day and we're working hard to continue to increase her knowledge graph," Puneesh Kumar, Country Leader for Alexa, Amazon India, told IANS. "We also encourage more Indian customers to try Cleo skill and help Alexa learn more Indian languages," he added. The language-learning skill called Cleo helps customers respond to Alexa in Hindi, Tamil, Marathi, Kannada, Bengali, Telugu, Gujarati and other languages.

By Ratna Mehta Technological advancement is a double-edged sword; while it oils the wheels of advancement and innovation leading to breakthroughs that improve efficiency, rationalise cost and improve the quality of life, it has its fallouts, i.e. job losses, health issues and environmental pollution. Man vs Machine With the rise of AI, there is increasing anxiety around massive job displacement. This is substantiated by widespread research: - Accountants have a 95% chance of losing jobs - 29% of legal sector jobs could be automated in 10 years - Intelligent agents and robots could replace 30% of the world's current human labour Being a trader was an esteemed profession, but with AI systems that can analyse information from markets, social media, corporate filings and economic conditions to quickly decipher trades, these systems can trade better than any human. As per analysis firm Oxford Economics, up to 20 million manufacturing jobs around the world could be replaced with robots by 2030. Man and Machine Joining Forces How we use technology depends on our perspective; we can use it to'replace' humans or we can leverage it to'augment' humans.

Machine Learning Prerequisites for 2021 - Udemy Courses Learn the foundation and prerequisites to become a Machine Learning Engineer Created by Pythonist orgPreview this Course - GET COUPON CODE In this course, you are going to learn the prerequisites for machine learning. Machine Learning is a vast subject that involved various other fields like Mathematics and Statistics which makes it complex. So when someone starts this journey there are very high chances to get confused due to too many concepts bombarded at you. It's an experienced opinion that a strong foundation can help us to make this journey much easier, this will provide a jump start for modern machine learning by teaching the important concepts required to get started with machine learning. We will start this course by getting ourself introduced withe machine learning then we will set up the development environment on various systems and move towards mathematics where we will explore various important concepts from Calculus and Linear Algebra followed by Statistics where we will learn about the Probability distribution, bias, and variance, mean, median and mode along with various other important concepts.

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