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Quantum Machine Intelligence

Large scale structure-aware pronoun resolution using quantum natural language processing

Hadi Wazni, Kin Ian Lo, Lachlan McPheat, Mehrnoosh Sadrzadeh

Published Sep 16, 2024• 6 citations
Publisher

Abstract

Abstract Natural language consists of words, sentences, and larger units. Guided by grammatical structure, words compose with each other to form sentences. Similarly, guided by discourse structure, sentences compose with each other to form dialogues and documents. Classical machine learning algorithms have achieved significant success in learning the meanings of words. When it comes to meanings of sentences and discourse units, they however fall short of being compositional. The DisCoCat model of meaning, introduced by Clark, Coecke, and Sadrzadeh in 2010, provides a solution—at the sentence level—using higher-order tensors, the learning of which has been a challenge. A recent initiative known as Quantum Natural Language Processing (QNLP) introduces a translation between the DisCoCat tensors and Variational Quantum Circuits (VQC). This offers the potential of learning these higher-order tensors more efficiently when the circuits are executed on quantum computers. In previous work, we lifted the DisCoCat framework from the sentence level to the discourse level using a Fock space semantics. In this paper, we extend the DisCoCat-VQC translation to this semantics and experiment with it in a discourse task. We develop a massive dataset with 16,400 entries inspired by a major coreference resolution task, known as the Winograd Schema Challenge, proposed as a test of machine intelligence. Noisy and noiseless simulations were executed on IBMQ software, and the parameters of the discourse VQCs were learnt. The model converged to 77.5% accuracy, surpassing a Bag-of-Words model that neglects any structure. It also outperformed 2 out of 3 state-of-the-art classical coreference resolution architectures. These findings highlight the significant potential of quantum machine learning in advancing discourse analysis and structured natural language processing.

DOI
10.1007/s42484-024-00193-w

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Abstract Natural language consists of words, sentences, and larger units. Guided by grammatical structure, words compose with each other to form sentences. Similarly, guided by discourse structure, sentences compose with each other to form dialogues and documents. Classical machine learning algorithms have achieved significant success in learning the meanings of words. When it comes to meanings of sentences and discourse units, they however fall short of being compositional. The DisCoCat model of meaning, introduced by Clark, Coecke, and Sadrzadeh in 2010, provides a solution—at the sentence level—using higher-order tensors, the learning of which has been a challenge. A recent initiative known as Quantum Natural Language Processing (QNLP) introduces a translation between the DisCoCat tensors and Variational Quantum Circuits (VQC). This offers the potential of learning these higher-order tensors more efficiently when the circuits are executed on quantum computers. In previous work, we lifted the DisCoCat framework from the sentence level to the discourse level using a Fock space semantics. In this paper, we extend the DisCoCat-VQC translation to this semantics and experiment with it in a discourse task. We develop a massive dataset with 16,400 entries inspired by a major coreference resolution task, known as the Winograd Schema Challenge, proposed as a test of machine intelligence. Noisy and noiseless simulations were executed on IBMQ software, and the parameters of the discourse VQCs were learnt. The model converged to 77.5% accuracy, surpassing a Bag-of-Words model that neglects any structure. It also outperformed 2 out of 3 state-of-the-art classical coreference resolution architectures. These findings highlight the significant potential of quantum machine learning in advancing discourse analysis and structured natural language processing.
Guided by grammatical structure, words compose to form sentences, and guided by discourse structure, sentences compose to form dialogues and documents.The compositional aspect of sentence and discourse units is often overlooked by machine learning algorithms.A recent initiative called Quantum Natural Language Processing (QNLP) learns word meanings as points in a Hilbert space and acts on them via a translation of grammatical structure into Parametrised Quantum Circuits (PQCs).Previous work extended the QNLP translation to discourse structure using points in a closure of Hilbert spaces.In this paper, we evaluate this translation on a Winograd-style pronoun resolution task.We train a Variational Quantum Classifier (VQC) for binary classification and implement an end-to-end pronoun resolution system.The simulations executed on IBMQ software converged with an F1 score of 87.20%.The model outperformed two out of three classical coreference resolution systems and neared state-of-the-art SpanBERT.A mixed quantumclassical model yet improved these results with an F1 score increase of around 6%.
As part of the recent research effort on quantum natural language processing (QNLP), variational quantum sentence classifiers (VQSCs) have been implemented and supported in lambeq / DisCoPy, based on the DisCoCat model of sentence meaning. We discuss in some detail VQSCs, including category theory, DisCoCat for modeling sentence as string diagram, and DisCoPy for encoding string diagram as parameterized quantum circuit. Many NLP tasks, however, require the handling of text consisting of multiple sentences, which is not supported in lambeq / DisCoPy. A good example is sentiment classification of customer feedback or product review. We discuss three potential approaches to variational quantum text classifiers (VQTCs), in line with VQSCs. The first is a weighted bag-of-sentences approach which treats text as a group of independent sentences with task-specific sentence weighting. The second is a coreference resolution approach which treats text as a consolidation of its member sentences with coreferences among them resolved. Both approaches are based on the DisCoCat model and should be implementable in lambeq / DisCoCat. The third approach, on the other hand, is based on the DisCoCirc model which considers both ordering of sentences and interaction of words in composing text meaning from word and sentence meanings. DisCoCirc makes fundamental modification of DisCoCat since a sentence in DisCoCirc updates meanings of words, whereas all meanings are static in DisCoCat. It is not clear if DisCoCirc can be implemented in lambeq / DisCoCat without breaking DisCoCat.
Quantum Natural Language Processing (QNLP) deals with the design and implementation of NLP models intended to be run on quantum hardware. In this paper, we present results on the first NLP experiments conducted on Noisy Intermediate-Scale Quantum (NISQ) computers for datasets of size greater than 100 sentences. Exploiting the formal similarity of the compositional model of meaning by Coecke, Sadrzadeh, and Clark (2010) with quantum theory, we create representations for sentences that have a natural mapping to quantum circuits. We use these representations to implement and successfully train NLP models that solve simple sentence classification tasks on quantum hardware. We conduct quantum simulations that compare the syntax-sensitive model of Coecke et al. with two baselines that use less or no syntax; specifically, we implement the quantum analogues of a “bag-of-words” model, where syntax is not taken into account at all, and of a word-sequence model, where only word order is respected. We demonstrate that all models converge smoothly both in simulations and when run on quantum hardware, and that the results are the expected ones based on the nature of the tasks and the datasets used. Another important goal of this paper is to describe in a way accessible to AI and NLP researchers the main principles, process and challenges of experiments on quantum hardware. Our aim in doing this is to take the first small steps in this unexplored research territory and pave the way for practical Quantum Natural Language Processing.
We use the Lambek Calculus with soft sub-exponential modalities to model and reason about discourse relations such as anaphora and ellipsis. A semantics for this logic is obtained by using truncated Fock spaces, developed in our previous work. We depict these semantic computations via a new string diagram. The Fock Space semantics has the advantage that its terms are learnable from large corpora of data using machine learning and they can be experimented with on mainstream natural language tasks. Further, and thanks to an existing translation from vector spaces to quantum circuits, we can also learn these terms on quantum computers and their simulators, such as the IBMQ range. We extend the existing translation to Fock spaces and develop quantum circuit semantics for discourse relations. We then experiment with the IBMQ AerSimulations of these circuits in a definite pronoun resolution task, where the highest accuracies were recorded for models when the anaphora was resolved.
In this work, we describe a full-stack pipeline for natural language processing on near-term quantum computers, aka QNLP. The language-modelling framework we employ is that of compositional distributional semantics (DisCoCat), which extends and complements the compositional structure of pregroup grammars. Within this model, the grammatical reduction of a sentence is interpreted as a diagram, encoding a specific interaction of words according to the grammar. It is this interaction which, together with a specific choice of word embedding, realises the meaning (or "semantics") of a sentence. Building on the formal quantum-like nature of such interactions, we present a method for mapping DisCoCat diagrams to quantum circuits. Our methodology is compatible both with NISQ devices and with established Quantum Machine Learning techniques, paving the way to near-term applications of quantum technology to natural language processing.
The main goal of this master's thesis is to introduce Quantum Natural Language Processing (QNLP) in a way understandable by both the NLP engineer and the quantum computing practitioner. QNLP is a recent application of quantum computing that aims at representing sentences' meaning as vectors encoded into quantum computers. To achieve this, the distributional meaning of words is extended by the compositional meaning of sentences (DisCoCat model) : the vectors representing words' meanings are composed through the syntactic structure of the sentence. This is done using an algorithm based on tensor products. We see that this algorithm is inefficient on classical computers but scales well using quantum circuits. After exposing the practical details of its implementation, we go through three use-cases.