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United States Code


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Annual Report


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Python 3 and Feature Engineering


Book Description

This book is designed for data scientists, machine learning practitioners, and anyone with a foundational understanding of Python 3.x. In the evolving field of data science, the ability to manipulate and understand datasets is crucial. The book offers content for mastering these skills using Python 3. The book provides a fast-paced introduction to a wealth of feature engineering concepts, equipping readers with the knowledge needed to transform raw data into meaningful information. Inside, you’ll find a detailed exploration of various types of data, methodologies for outlier detection using Scikit-Learn, strategies for robust data cleaning, and the intricacies of data wrangling. The book further explores feature selection, detailing methods for handling imbalanced datasets, and gives a practical overview of feature engineering, including scaling and extraction techniques necessary for different machine learning algorithms. It concludes with a treatment of dimensionality reduction, where you’ll navigate through complex concepts like PCA and various reduction techniques, with an emphasis on the powerful Scikit-Learn framework. FEATURES Includes numerous practical examples and partial code blocks that illuminate the path from theory to application Explores everything from data cleaning to the subtleties of feature selection and extraction, covering a wide spectrum of feature engineering topics Offers an appendix on working with the “awk” command-line utility Features companion files available for downloading with source code, datasets, and figures




Nine Men in Gray


Book Description

Porter Alexander is not a household name today, but he should be remembered as one of Robert E. Lee's most valuable officers. Bold and imaginative, Alexander was an artillerist whose service was requested by every Confederate army commander. He and eight other "men in gray" come to life in vivid sketches by Charles L. Dufour. Singled out are Dick Taylor, the handsome son of former president Zachary Taylor who led the Louisiana Brigade; Turner Ashby, an expert horseman whose death in battle typified the doomed gallantry of the Rebels; Pat Cleburne of the Army of Tennessee, who was called "the Stonewall of the West"; "Savez" Read, a navy man who terrorized the Atlantic seaboard in a one-gun sailing vessel; Willie Pegram, a shy Virginian who was a bold cannoneer; Lucius B. Northrop, whose abrasive personality complicated his task of feeding the army; William Mahone, whose ferocious fighting spirit belied his bantam size; and Henry Hotze, who served brilliantly as a Confederate agent and propagandist.