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Technical Latent Semantic Mapping: Principles And Applications (Synthesis Lectures on Speech and Audio Process
Posted on 2010-04-11
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[2007/0910] [2007/0910] . Latent Semantic Mapping: Principles And Applications (Synthesis Lectures on Speech and Audio Processing) ABSTRACT Latent semantic mapping (LSM) is a generalization of latent semantic analysis (LSA), a paradigm originally developed to capture hidden word patterns in a text document corpus. In information retrieval, LSA enables retrieval on the basis of conceptual content, instead of merely matching words between queries and documents. It operates under the assumption that there is some latent semantic structure in the data, which is partially obscured by the randomness of word choice with respect to retrieval. Algebraic and/or statistical techniques are brought to bear to estimate this structure and get rid of the obscuring noise. This results in a parsimonious continuous parameter description of words and documents, which then replaces the original parameterization in indexing and retrieval. This approach exhibits three main characteristics: * discrete entities (words and documents) are mapped onto a continuous vector space; * this mapping is determined by global correlation patterns; and * dimensionality reduction is an integral part of the process. Such fairly generic properties are advantageous in a variety of different contexts, which motivates a broader interpretation of the underlying paradigm. The outcome (LSM) is a data-driven framework for modeling meaningful global relationships implicit in large volumes of (not necessarily textual) data. This monograph gives a general overview of the framework, and underscores the multifaceted benefits it can bring to a number of problems in natural language understanding and spoken language processing. It concludes with a discussion of the inherent tradeoffs associated with the approach, and some perspectives on its general applicability to data-driven information extraction. KEYWORDS natural language processing, long-span dependencies, data-driven modeling, parsimonious representation, singular value decomposition. CONTENTS I. Principles 1. Introduction 1.1 Motivation 1.2 From LSA to LSM 1.3 Organization 1.3.1 Part I 1.3.2 Part II 1.3.3 Part III 2. Latent Semantic Mapping 2.1 Co-occurrence Matrix 2.2 Vector Representation 2.2.1 Singular Value Decomposition 2.2.2 SVD Properties 2.3 Interpretation 3. LSM Feature Space 3.1 Closeness Measures 3.1.1 UnitCUnit Comparisons 3.1.2 CompositionCComposition Comparisons 3.1.3 UnitCComposition Comparisons 3.2 LSM Framework Extension 3.3 Salient Characteristics 4. Computational Effort 4.1 OffCLine Cost 4.2 Online Cost 4.3 Possible Shortcuts 4.3.1 Incremental SVD Implementations 4.3.2 Other Matrix Decompositions 4.3.3 Alternative Formulations 5. Probabilistic Extensions 5.1 Dual Probability Model 5.1.1 Composition Model 5.1.2 Unit Model 5.1.3 Comments 5.2 Probabilistic Latent Semantic Analysis 5.3 Inherent Limitations II. Applications 6. Junk ECMail Filtering 6.1 Conventional Approaches 6.1.1 Header Analysis 6.1.2 Rule-Based Predicates 6.1.3 Machine Learning Approaches 6.2 LSM-Based Filtering 6.3 Performance 7. Semantic Classification 7.1 Underlying Issues 7.1.1 Case Study: Desktop Interface Control 7.1.2 Language Modeling Constraints 7.2 Semantic Inference 7.2.1 Framework 7.2.2 Illustration 7.3 Caveats 8. Language Modeling 8.1 N-Gram Limitations 8.2 MultiSpan Language Modeling 8.2.1 Hybrid Formulation 8.2.2 Context Scope Selection 8.2.3 LSM Probability 8.3 Smoothing 8.3.1 Word Smoothing 8.3.2 Document Smoothing 8.3.3 Joint Smoothing 9. Pronunciation Modeling 9.1 Grapheme-to-Phoneme Conversion 9.1.1 TopCDown Approaches 9.1.2 Illustration 9.1.3 BottomCUp Approaches 9.2 Pronunciation by Latent Analogy 9.2.1 Orthographic Neighborhoods 9.2.2 Sequence Alignment 10. Speaker Verification 10.1 The Task 10.2 LSM-based speaker verification 10.2.1 Single-Utterance Representation 10.2.2 LSM-Tailored Metric 10.2.3 Integration with DTW 11. TTS Unit Selection 11.1 Concatenative Synthesis 11.2 LSM-Based Unit Selection 11.2.1 Feature Extraction 11.2.2 Comparison to Fourier Analysis 11.2.3 Properties 11.3 LSM-Based Boundary Training III. Perspectives 12. Discussion 12.1 Inherent Tradeoffs 12.1.1 Descriptive Power 12.1.2 Domain Sensitivity 12.1.3 Adaptation Capabilities 12.2 General Applicability 12.2.1 Natural Language Processing 12.2.2 Generic Pattern Recognition 13. Conclusion 13.1 Summary 13.2 Perpectives Bibliography Author Biography Password: ebooksclub.org File size: 0.7 MB Format: PDF
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