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Deep Learning英文书籍
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Inventors have long dreamed of creating machines that think. This desire dates back to at least the time of ancient Greece. The mythical figures Pygmalion， Daedalus， and Hephaestus may all be interpreted as legendary inventors， and Galatea， Talos， and Pandora may all be regarded as artificial life （Ovid and Martin， 2004; Sparkes， 1996; Tandy， 1997）。 When programmable computers were first conceived， people wondered whether such machines might become intelligent， over a hundred years before one was built （Lovelace， 1842）。 Today， artificial intelligence （AI） is a thriving field with many practical applications and active research topics. We look to intelligent software to automate routine labor， understand speech or images， make diagnoses in medicine and support basic scientific research. In the early days of artificial intelligence， the field rapidly tackled and solved problems that are intellectually difficult for human beings but relatively straightforward for computers—problems that can be described by a list of formal， math- ematical rules. The true challenge to artificial intelligence proved to be solving the tasks that are easy for people to perform but hard for people to describe formally—problems that we solve intuitively， that feel automatic， like recognizing spoken words or faces in images. This book is about a solution to these more intuitive problems. This solution is to allow computers to learn from experience and understand the world in terms of a hierarchy of concepts， with each concept defined in terms of its relation to simpler concepts. By gathering knowledge from experience， this approach avoids the need for human operators to formally specify all of the knowledge that the computer needs. The hierarchy of concepts allows the computer to learn complicated concepts by building them out of simpler ones. If we draw a graph showing how theseconcepts are built on top of each other， the graph is deep， with many layers. For this reason， we call this approach to AI deep learning.
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