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<body><div class="nonumber_header"><h2>Frequently Asked Questions</h2></div><div class="section"><div id="toc">
<p class="toc_title"><a href="index.html">ニューラルネットワークと深層学習</a></p><p class="toc_not_mainchapter"><a href="about.html">What this book is about</a></p><p class="toc_not_mainchapter"><a href="exercises_and_problems.html">On the exercises and problems</a></p><p class='toc_mainchapter'><a id="toc_using_neural_nets_to_recognize_handwritten_digits_reveal" class="toc_reveal" onMouseOver="this.style.borderBottom='1px solid #2A6EA6';" onMouseOut="this.style.borderBottom='0px';"><img id="toc_img_using_neural_nets_to_recognize_handwritten_digits" src="images/arrow.png" width="15px"></a><a href="chap1.html">ニューラルネットワークを用いた手書き文字認識</a><div id="toc_using_neural_nets_to_recognize_handwritten_digits" style="display: none;"><p class="toc_section"><ul><a href="chap1.html#perceptrons"><li>Perceptrons</li></a><a href="chap1.html#sigmoid_neurons"><li>Sigmoid neurons</li></a><a href="chap1.html#the_architecture_of_neural_networks"><li>The architecture of neural networks</li></a><a href="chap1.html#a_simple_network_to_classify_handwritten_digits"><li>A simple network to classify handwritten digits</li></a><a href="chap1.html#learning_with_gradient_descent"><li>Learning with gradient descent</li></a><a href="chap1.html#implementing_our_network_to_classify_digits"><li>Implementing our network to classify digits</li></a><a href="chap1.html#toward_deep_learning"><li>Toward deep learning</li></a></ul></p></div>
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});</script><p class='toc_mainchapter'><a id="toc_how_the_backpropagation_algorithm_works_reveal" class="toc_reveal" onMouseOver="this.style.borderBottom='1px solid #2A6EA6';" onMouseOut="this.style.borderBottom='0px';"><img id="toc_img_how_the_backpropagation_algorithm_works" src="images/arrow.png" width="15px"></a><a href="chap2.html">逆伝播の仕組み</a><div id="toc_how_the_backpropagation_algorithm_works" style="display: none;"><p class="toc_section"><ul><a href="chap2.html#warm_up_a_fast_matrix-based_approach_to_computing_the_output_from_a_neural_network"><li>Warm up: a fast matrix-based approach to computing the output from a neural network</li></a><a href="chap2.html#the_two_assumptions_we_need_about_the_cost_function"><li>The two assumptions we need about the cost function</li></a><a href="chap2.html#the_hadamard_product_$s_\odot_t$"><li>The Hadamard product, $s \odot t$</li></a><a href="chap2.html#the_four_fundamental_equations_behind_backpropagation"><li>The four fundamental equations behind backpropagation</li></a><a href="chap2.html#proof_of_the_four_fundamental_equations_(optional)"><li>Proof of the four fundamental equations (optional)</li></a><a href="chap2.html#the_backpropagation_algorithm"><li>The backpropagation algorithm</li></a><a href="chap2.html#the_code_for_backpropagation"><li>The code for backpropagation</li></a><a href="chap2.html#in_what_sense_is_backpropagation_a_fast_algorithm"><li>In what sense is backpropagation a fast algorithm?</li></a><a href="chap2.html#backpropagation_the_big_picture"><li>Backpropagation: the big picture</li></a></ul></p></div>
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});</script><p class='toc_mainchapter'><a id="toc_improving_the_way_neural_networks_learn_reveal" class="toc_reveal" onMouseOver="this.style.borderBottom='1px solid #2A6EA6';" onMouseOut="this.style.borderBottom='0px';"><img id="toc_img_improving_the_way_neural_networks_learn" src="images/arrow.png" width="15px"></a><a href="chap3.html">ニューラルネットワークの学習の改善</a><div id="toc_improving_the_way_neural_networks_learn" style="display: none;"><p class="toc_section"><ul><a href="chap3.html#the_cross-entropy_cost_function"><li>The cross-entropy cost function</li></a><a href="chap3.html#overfitting_and_regularization"><li>Overfitting and regularization</li></a><a href="chap3.html#weight_initialization"><li>Weight initialization</li></a><a href="chap3.html#handwriting_recognition_revisited_the_code"><li>Handwriting recognition revisited: the code</li></a><a href="chap3.html#how_to_choose_a_neural_network's_hyper-parameters"><li>How to choose a neural network's hyper-parameters?</li></a><a href="chap3.html#other_techniques"><li>Other techniques</li></a></ul></p></div>
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});</script><p class='toc_mainchapter'><a id="toc_a_visual_proof_that_neural_nets_can_compute_any_function_reveal" class="toc_reveal" onMouseOver="this.style.borderBottom='1px solid #2A6EA6';" onMouseOut="this.style.borderBottom='0px';"><img id="toc_img_a_visual_proof_that_neural_nets_can_compute_any_function" src="images/arrow.png" width="15px"></a><a href="chap4.html">ニューラルネットワークが任意の関数を表現できることの視覚的証明</a><div id="toc_a_visual_proof_that_neural_nets_can_compute_any_function" style="display: none;"><p class="toc_section"><ul><a href="chap4.html#two_caveats"><li>Two caveats</li></a><a href="chap4.html#universality_with_one_input_and_one_output"><li>Universality with one input and one output</li></a><a href="chap4.html#many_input_variables"><li>Many input variables</li></a><a href="chap4.html#extension_beyond_sigmoid_neurons"><li>Extension beyond sigmoid neurons</li></a><a href="chap4.html#fixing_up_the_step_functions"><li>Fixing up the step functions</li></a><a href="chap4.html#conclusion"><li>Conclusion</li></a></ul></p></div>
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});</script><p class='toc_mainchapter'><a id="toc_why_are_deep_neural_networks_hard_to_train_reveal" class="toc_reveal" onMouseOver="this.style.borderBottom='1px solid #2A6EA6';" onMouseOut="this.style.borderBottom='0px';"><img id="toc_img_why_are_deep_neural_networks_hard_to_train" src="images/arrow.png" width="15px"></a><a href="chap5.html">ニューラルネットワークを訓練するのはなぜ難しいのか</a><div id="toc_why_are_deep_neural_networks_hard_to_train" style="display: none;"><p class="toc_section"><ul><a href="chap5.html#the_vanishing_gradient_problem"><li>The vanishing gradient problem</li></a><a href="chap5.html#what's_causing_the_vanishing_gradient_problem_unstable_gradients_in_deep_neural_nets"><li>What's causing the vanishing gradient problem? Unstable gradients in deep neural nets</li></a><a href="chap5.html#unstable_gradients_in_more_complex_networks"><li>Unstable gradients in more complex networks</li></a><a href="chap5.html#other_obstacles_to_deep_learning"><li>Other obstacles to deep learning</li></a></ul></p></div>
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});</script><p class='toc_mainchapter'><a id="toc_deep_learning_reveal" class="toc_reveal" onMouseOver="this.style.borderBottom='1px solid #2A6EA6';" onMouseOut="this.style.borderBottom='0px';"><img id="toc_img_deep_learning" src="images/arrow.png" width="15px"></a>Deep learning<div id="toc_deep_learning" style="display: none;"><p class="toc_section"><ul><li>Convolutional neural networks</li><li>Pretraining</li><li>Recurrent neural networks, Boltzmann machines, and other models</li><li>Is there a universal thinking algorithm?</li><li>On the future of neural networks</li></ul></p></div>
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});</script><p class="toc_not_mainchapter"><a href="acknowledgements.html">Acknowledgements</a></p><p class="toc_not_mainchapter"><a href="faq.html">Frequently Asked Questions</a></p>
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<p class="sidebar">著者と共にこの本を作り出してくださった<a
href="supporters.html">サポーター</a>の皆様に感謝いたします。
また、<a
href="bugfinder.html">バグ発見者の殿堂</a>に名を連ねる皆様にも感謝いたします。
また、日本語版の出版にあたっては、<a
href="translators.html">翻訳者</a>の皆様に深く感謝いたします。
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<p class="sidebar">この本は目下のところベータ版で、開発続行中です。
エラーレポートは [email protected] まで、日本語版に関する質問は [email protected] までお送りください。
その他の質問については、まずは<a
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著：<a href="http://michaelnielsen.org">Michael Nielsen</a> / 2014年9月-12月 <br > 訳：<a href="https://github.com/nnadl-ja/nnadl_site_ja">「ニューラルネットワークと深層学習」翻訳プロジェクト</a>
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</p><p><strong>Is there a pdf or print version of the book available, or planned?</strong> There's no pdf or print version available, nor planned.</p><p>People sometimes suggest that it would be easy to convert the book topdf or print. However, the book contains dozens of interactiveJavaScript elements, and the narrative often depends on the readerinteracting with those elements in some way. Doing the "easy"conversion would result in a poor quality product. Of course, thoseinteractive parts could be rewritten to make sense in static form, butdoing it well would be a big job.</p><p><strong>Can you help me a mathematical problem, or with debugging my work?</strong> No. I suggest chatting about your problem with friends orcolleagues. If that's no help, try an appropriate online forum to askyour question.</p><p><strong>Do you have solutions to the exercises and problems?</strong> Sorry,no.</p><p><strong>I'd like to do a translation into another language. Is that okay?</strong> It's fine under the terms of the book's license (see thepage footer for details), provided: (1) you're not doing it for aproduct which is commercial in some way (e.g., you intend to sell it);and (2) you acknowledge me as the original author. I'd alsoappreciate a link, of course. If you have a commercial interest,please get in touch so we can discuss ([email protected]).</p><p><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></p><p></div><div class="footer"> <span class="left_footer"> In academic work,
please cite this book as: Michael A. Nielsen, "Neural Networks and
Deep Learning", Determination Press, 2015
<br/>
<br/>
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build on this book, but not to sell it. If you're interested in
commercial use, please <a
href="mailto:[email protected]">contact me</a>.
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Last update: Sun Dec 21 14:49:05 2014
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