Objectives: Terminology Components The Design Cycle Resources: DHS Slides – Chapter 1 Glossary Java Applet URL:.../publications/courses/ece_8443/lectures/current/lecture_02.ppt.../publications/courses/ece_8443/lectures/current/lecture_02.ppt.

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Objectives: Terminology Components The Design Cycle Resources: DHS Slides – Chapter 1 Glossary Java Applet URL:.../publications/courses/ece_8443/lectures/current/lecture_02.ppt.../publications/courses/ece_8443/lectures/current/lecture_02.ppt ECE 8443 – Pattern Recognition LECTURE 02: INTRODUCTION

02: OVERVIEW TERMINOLOGY Pattern Recognition: “the act of taking raw data and taking an action based on the category of the pattern.” Common Applications: speech recognition, fingerprint identification (biometrics), DNA sequence indentification Related Terminology:  Machine Learning: The ability of a machine to improve its performance based on previous results.  Machine Understanding: acting on the intentions of the user generating the data. Related Fields: artificial intelligence, signal processing and discipline-specific research (e.g., target recognition, speech recognition, natural language processing).

PARTITIONING INTO COMPONENTS Feature Extraction Post-Processing Classification Segmentation Sensing Input Decision 02: OVERVIEW

THE DESIGN CYCLE Train Classifier Choose Model Choose Features Evaluate Classifier End Collect Data Start Key issues: “There is no data like more data.” Perceptually-meaningful features? How do we find the best model? How do we estimate parameters? How do we evaluate performance? Goal of the course: Introduce you to mathematically rigorous ways to train and evaluate models.

02: OVERVIEW COMMON MISTAKES I got 100% accuracy on...  Almost any algorithm works some of the time, but few real-world problems have ever been completely solved.  Training on the evaluation data is forbidden.  Once you use evaluation data, you should discard it. My algorithm is better because...  Statistical significance and experimental design play a big role in determining the validity of a result.  There is always some probability a random choice of an algorithm will produce a better result. Hence, in this course, we will also learn how to evaluate algorithms.