theano官方文档.pdf

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theano Documentation Release 0.9.0 LISA lab, University of Montreal April 21, 2017

1 News 2 Download 3 Citing Theano 4 Documentation 5 Community 6 Help! Python Module Index CONTENTS 3 5 7 9 11 13 627 i

theano Documentation, Release 0.9.0 Theano is a Python library that allows you to deﬁne, optimize, and evaluate mathematical expressions in- volving multi-dimensional arrays efﬁciently. Theano features: • tight integration with NumPy – Use numpy.ndarray in Theano-compiled functions. • transparent use of a GPU – Perform data-intensive computations much faster than on a CPU. • efﬁcient symbolic differentiation – Theano does your derivatives for functions with one or many inputs. • speed and stability optimizations – Get the right answer for log(1+x) even when x is really tiny. • dynamic C code generation – Evaluate expressions faster. • extensive unit-testing and self-veriﬁcation – Detect and diagnose many types of errors. Theano has been powering large-scale computationally intensive scientiﬁc investigations since 2007. But it is also approachable enough to be used in the classroom (University of Montreal’s deep learning/machine learning classes). CONTENTS 1

theano Documentation, Release 0.9.0 2 CONTENTS

CHAPTER ONE NEWS • 2017/03/20: Release of Theano 0.9.0. Everybody is encouraged to update. • 2017/03/13: Release of Theano 0.9.0rc4, with crash ﬁxes and bug ﬁxes. • 2017/03/06: Release of Theano 0.9.0rc3, with crash ﬁxes, bug ﬁxes and improvements. • 2017/02/27: Release of Theano 0.9.0rc2, with crash ﬁxes, bug ﬁxes and improvements. • 2017/02/20: Release of Theano 0.9.0rc1, many improvements and bugﬁxes, ﬁnal release to coming. • 2017/01/24: Release of Theano 0.9.0beta1, many improvements and bugﬁxes, release candidate to coming. • 2016/05/09: New technical report on Theano: Theano: A Python framework for fast computation of mathematical expressions. This is the new preferred reference. • 2016/04/21: Release of Theano 0.8.2, adding support for CuDNN v5. • 2016/03/29: Release of Theano 0.8.1, ﬁxing a compilation issue on MacOS X with XCode 7.3. • 2016/03/21: Release of Theano 0.8. Everybody is encouraged to update. • Multi-GPU. • We added support for CNMeM to speed up the GPU memory allocation. • Theano 0.7 was released 26th March 2015. Everybody is encouraged to update. • We support cuDNN if it is installed by the user. • Open Machine Learning Workshop 2014 presentation. • Colin Raffel tutorial on Theano. • Ian Goodfellow did a 12h class with exercises on Theano. • New technical report on Theano: Theano: new features and speed improvements. • HPCS 2011 Tutorial. We included a few ﬁxes discovered while doing the Tutorial. 3

theano Documentation, Release 0.9.0 You can watch a quick (20 minute) introduction to Theano given as a talk at SciPy 2010 via streaming (or downloaded) video: Transparent GPU Computing With Theano. James Bergstra, SciPy 2010, June 30, 2010. 4 Chapter 1. News

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