Beyond the symbolic vs non-symbolic AI debate by JC Baillie

A Beginner’s Guide to Symbolic Reasoning Symbolic AI & Deep Learning Deeplearning4j: Open-source, Distributed Deep Learning for the JVM

symbolic machine learning

So the main challenge, when we think about GOFAI and neural nets, is how to ground symbols, or relate them to other forms of meaning that would allow computers to map the changing raw sensations of the world to symbols and then reason about them. So to summarize, one of the main differences between machine learning and traditional symbolic reasoning is how the learning happens. A key component of the system architecture for all expert systems is the knowledge base, which stores facts symbolic machine learning and rules for problem-solving.[52]
The simplest approach for an expert system knowledge base is simply a collection or network of production rules. Production rules connect symbols in a relationship similar to an If-Then statement. The expert system processes the rules to make deductions and to determine what additional information it needs, i.e. what questions to ask, using human-readable symbols. For example, OPS5, CLIPS and their successors Jess and Drools operate in this fashion.

  • These are bound with symbolic vectors identifying each individual hashing network and aggregated via consensus sum.
  • This is despite the fact that each model is successively more state-of-the-art, meaning that there is no catastrophic loss in integrating newer models into the inference system as more are developed.
  • One advantage of the hyperdimensional architecture for inference is how it can be easily manipulated.
  • Researchers are uncovering the connections between deep nets and principles in physics and mathematics.

Starting from the top, from an infinite pool of choices, GP creates the first population randomly, while the size of the population is predetermined by the user. Each configuration inside the population could possibly contribute as a poor fitness parameter, affecting the whole dataset. By continuously examining the effect of each one of these implementations, the process discovers promising candidates that produce small error, and employs them in future implementations, while those with poor performance are abandoned. Furthermore, the selection of those parts (sub-configurations) are random (e.g., sub-configuration from Fig. 4a), resulting that way on a generated symbolic expression that differs in terms of tree shape and depth compared to the parental expression.

Symbolic Representation and Learning With Hyperdimensional Computing

Starting from the atomic scale, ab-initio methods (first principles) are performed by quantum mechanics (QM) calculations in order to obtain a form that describes the energy of a system, the potential energy surface (PES). Calculations are derived directly from physical laws and do not require the incorporation of any experimental data or assumptions. However, these are based on finding solutions to the Schrödinger’s equation, which may not be practical for most real-world systems. This can be partly anticipated by the incorporation of the density functional theory (DFT) [133]. Albeit capable of achieving quantum-accuracy, the usage of atomistic methods is limited in terms of the accessible computational time and simulation size. In contrast, the main drawback of SR is by no doubt the computational time needed for evaluating thousands or more equations [128].

symbolic machine learning

• Along the same lines, many modern-day symbolic reasoning systems also rely on real-value computations or representations, especially when data driven. For a classification task, during training time, training images are hashed into binary vector representations. These are aggregated with the consensus sum operation in Equation (5) across their corresponding gold-standard classes, and a random basis vector meant to symbolically represent the correct class is bound to the aggregate with Equation (1). The resultant vector now represents a memory containing all training instances observed but that are represented symbolically with appropriated hashed binary vectors that are projected into a hyperdimensional binary space by randomly permuting and assembling the hash vector. This dog class is aggregated into a larger vector, once again with the consensus sum operation in Equation (5), to produce a hyperdimensional vector containing similar memory vectors across the other classes.

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The botmaster also has full transparency on how to fine-tune the engine when it doesn’t work properly, as it’s possible to understand why a specific decision has been made and what tools are needed to fix it. The tremendous success of deep learning systems is forcing researchers to examine the theoretical principles that underlie how deep nets learn. Researchers are uncovering the connections between deep nets and principles in physics and mathematics. He is worried that the approach may not scale up to handle problems bigger than those being tackled in research projects.

A combination of SL and UL has also been proposed in Semi-Supervised Learning (SSL) in which both labeled and unlabeled data are utilized. SSL focuses on the identification of how the learning procedure may be affected by a mixture of labeled and unlabeled data and the construction of algorithms capable of exploiting this scheme [62]. A certain set of structural rules are innate to humans, independent of sensory experience. With more linguistic stimuli received in the course of psychological development, children then adopt specific syntactic rules that conform to Universal grammar. But when we look at, and I’m going to get into the second part of this on this amazing paper that we were talking about, but we look at properties of symbols and symbolic systems.

Joint National Committee for Languages

Japan championed Prolog for its Fifth Generation Project, intending to build special hardware for high performance. Similarly, LISP machines were built to run LISP, but as the second AI boom turned to bust these companies could not compete with new workstations that could now run LISP or Prolog natively at comparable speeds. “Deep hashing network for efficient similarity retrieval,” in Thirtieth AAAI Conference on Artificial Intelligence (Phoenix, AZ). In the following sections, we present the results of our evaluation of the hyperdimensional inference layers in both experiments. Where ai are vector representations of corresponding Ai and Π is a permutation that represents the sequence. When using XOR, subsquences can be removed, replaced, or extended by constructing them and XOR-ing with a.

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SVM models are utilized for classification, while its regression counterpart is the Support Vector Regression (SVR) model [28]. DT methods employ tree-form graphs and have been utilized for classification tasks. DTs are susceptible to complexity and overfitting issues, and various alternatives have been constructed, such as Random Forest (RF) and Gradient Boost (GB), by employing different trees in a forest or a serial weighted manner, respectively [14]. There are many references in the literature for these models, which are not going to be covered here (see, for example, [65]). We propose the Neuro-Symbolic Concept Learner (NS-CL), a model that learns visual concepts, words, and semantic parsing of sentences without explicit supervision on any of them; instead, our model learns by simply looking at images and reading paired questions and answers.

Goals of Neuro Symbolic AI

Cognitive architectures such as ACT-R may have additional capabilities, such as the ability to compile frequently used knowledge into higher-level chunks. Time periods and titles are drawn from Henry Kautz’s 2020 AAAI Robert S. Engelmore Memorial Lecture[18] and the longer Wikipedia article on the History of AI, with dates and titles differing slightly for increased clarity.

symbolic machine learning

Integrating both approaches, known as neuro-symbolic AI, can provide the best of both worlds, combining the strengths of symbolic AI and Neural Networks to form a hybrid architecture capable of performing a wider range of tasks. Insofar as computers suffered from the same chokepoints, their builders relied on all-too-human hacks like symbols to sidestep the limits to processing, storage and I/O. As computational capacities grow, the way we digitize and process our analog reality can also expand, until we are juggling billion-parameter tensors instead of seven-character strings. Each approach—symbolic, connectionist, and behavior-based—has advantages, but has been criticized by the other approaches. Symbolic AI has been criticized as disembodied, liable to the qualification problem, and poor in handling the perceptual problems where deep learning excels.

Neural-symbolic computing: An effective methodology for principled integration of machine learning and reasoning

Deep neural networks are also very suitable for reinforcement learning, AI models that develop their behavior through numerous trial and error. This is the kind of AI that masters complicated games such as Go, StarCraft, and Dota. To fill the remaining gaps between the current state of the art and the fundamental goals of AI, Neuro-Symbolic AI (NS) seeks to develop a fundamentally new approach to AI. It specifically aims to balance (and maintain) the advantages of statistical AI (machine learning) with the strengths of symbolic or classical AI (knowledge and reasoning). It aims for revolution rather than development and building new paradigms instead of a superficial synthesis of existing ones. As a consequence, the botmaster’s job is completely different when using symbolic AI technology than with machine learning-based technology, as the botmaster focuses on writing new content for the knowledge base rather than utterances of existing content.

symbolic machine learning

Here, it has to be beard in mind that low complexity might indicate poor error performance, while high complexity value could be prone to overfitting (Pareto front) [56]. Secondly, there will be a brief presentation of several ML algorithms that researchers are most familiar with. Hobbes was influenced by Galileo, just as Galileo thought that geometry could represent motion, Furthermore, as per Descartes, geometry can be expressed as algebra, which is the study of mathematical symbols and the rules for manipulating these symbols. Using OOP, you can create extensive and complex symbolic AI programs that perform various tasks. Many of the concepts and tools you find in computer science are the results of these efforts.

Beyond the symbolic vs non-symbolic AI debate

However, their dataset were generated by sampling through already established equations and not experimental data and therefore their application is hindered [157]. The concept of increased accuracy is the focal point of GP approaches as it constitutes a key element on the applicability of ML models [93]. There have been efforts on modifying the basic GP-SR procedure [18, 94, 95, 96, 97, 98], while, on the other hand, some argue that GP-based procedures lead to abstract mathematical formulas that make no sense [83]. An intriguing idea that is also supported is the restriction of the search space into a set of symbols, by incorporating several constraints into the algorithm (usually by accepting prior knowledge about the system) [55, 58, 89, 99, 100].

Others, have successfully identified physical relations of fluids and kinetic laws of chemical reactions [171] or generated expression in order to predict the particle size distribution during fluidization [172]. Bloat is a common side effect that arises by GP, in which the results tend to suffer from a burst of complexity, while improvements on achieved fitting remain slight [131], though promising [131]. The evolutionary procedure proceeds step by step, as the average error is decreased due to the removal of poor-performing expressions. Eventually, at a predetermined point, the GP sequence finalizes, and the equation is exported. Finally, it should be noted that it is not mandatory for GP to produce one equation as it can be defined to export a number of suggestions, usually with a ranging complexity between equations.

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This is one of the reasons that SR is better suited in applications where the number of input parameters is as small as possible [129]. To confront this barrier, a common strategy is to first identify the most important factors in the dataset (this can be done by other ML models, such as RF [101]) and then apply SR. However, this technique may affect the obtained results when accuracy is the main question. Derived from the superset of AI available methods, SR is usually implemented by evolutionary algorithms.

  • Here, it has to be beard in mind that low complexity might indicate poor error performance, while high complexity value could be prone to overfitting (Pareto front) [56].
  • It is more likely to be bound on data science techniques and suggest an alternative method of explaining and discovering hidden patterns and behaviors in data coming from various sources.
  • SVM models are utilized for classification, while its regression counterpart is the Support Vector Regression (SVR) model [28].
  • Because machine learning algorithms can be retrained on new data, and will revise their parameters based on that new data, they are better at encoding tentative knowledge that can be retracted later if necessary.

As a result, the addition of the HIL, in either experiment, is negligible in terms of extra computations and execution time. This is in line with previous results shown in HAP (Mitrokhin et al., 2019), where in a matter of milliseconds the HIL can be trained, retrained from scratch, and even perform classification, on a standard CPU processor. This further indicates that there is virtually no downside to adopting the hyperdimensional approach presented in our architecture. The Deep Triplet Quantization Network (DTQ) further improves hashing quality by incorporating similarity triplets into the learning pipeline. By a new triplet selection approach, Group Hard, triplets are selected randomly from each image group that are deemed to be “hard.” Binary codes are further compacted by use of triplet quantization with weak orthogonality at training time. The Deep Cauchy Hashing Network (DCH) seeks to improve hash quality by penalizing similar image pairs having a Hamming Distance bigger than the radius specified by the hashing network (Cao et al., 2018).

symbolic machine learning

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