PyTorch ## LOSS及其梯度 主讲人：龙良曲 ## Typical Loss ## Mean Squared Error ## Cross Entropy Loss binary multi-class +softmax Leave it to Logistic Regression Part ## MSE $$ \begin{aligned} ■ loss=\sum[y-( |_{2}\end{array}\right. $$ $$ loss=norm(y-(xw+b))^{2} $$ ## Derivative $$ \textcircled{k}l o s s=\sum[y-f_{\theta}(x)]^{2} $$ $$ \blacksquare\frac{\nabla loss}{\nabla\theta}=2\sum[y-f_{\theta}(x)]*\frac{\nabla autograd.grad ## ☀️ ☁️ ☁️ In [15]: x=torch.ones(1) In [17]: w=torch.full([1],2) In [19]: mse=F.mse_loss(torch.ones(1), x*w) Out[20]: tensor(1.) In [21]: torch.autograd.grad(mse,[w]) #RuntimeError: element

## CROSS-PLATFORM PITFALLS AND HOW TO AVOID THEM Erika Sweet (she/her) Microsoft C++ Team ## Welcome to CppCon 2020! ### V isit our table at the Expo Hall https://aka.ms/cppcon/expo • Meet the Microsoft (e.g. NuGet) Language specific package managers (e.g. vcpkg, Conan) Our recommendation for C++ cross-platform development ## C++ package managers: Conan, vcpkg Bring down and build libraries from source solution space ## Debugging: the solution space Cross-platform IDEs, editors, and tools CLion, VS Code, Qt Creator ## Debugging: the solution space Cross-platform IDEs, editors, and tools CLion, VS Code

## +24 ## Cross-Platform Floating-Point Determinism Out of the Box ## SHERRY IGNATCHENKO ET AL ## Authors  ## All the Testability (Sort of)  2 Cross Platform Distributed Simulations, Games, especially RTS ![Image](/uploads/documents/f/b/c/c/ deterministic when using the identically compiled files and run on systems that adhere to the IEEE standards. Cross platform synchronized network simulations or replays will not possible [sic].” - Most upvoted answer

### Q2. why call logistic regression use sigmoid - Controversial! MSE => regression - Cross Entropy => classification 0.7 0.7 0.3 ## Binary Classification $$ \begin{aligned}&\bullet

High-Performance Cross-Platform Architecture: C++20 Innovations ## NOAH STEIN ## About Me • 35-year career in video games and embedded software • Started using C++ in 1995 • First cross-platform project project in 1994 ## Cross-Platform Architecture Goals • Take advantage of all platforms • Focus on the compiler • Minimize boilerplate and unnecessary code • Minimize redundant code • Minimize modifying

Source ..... 7 2.2 Decentralized package manager ..... 7 2.3 Binary management ..... 8 2.4 Cross platform, build system agnostic ..... 9 2.5 Stable ..... 9 3 Install ..... 11 3.1 Install with cache: concurrency, Continuous Integration, isolation ..... 100 10 Systems and cross building ..... 103 10.1 Cross building ..... 103 10.2 Windows Subsystems ..... 111 11 Integrations ..... integration ..... 173 12.7 How to manage C++ standard ..... 176 12.8 How to use docker to create and cross build C and C++ conan packages ..... 178 12.9 How to reuse Python code in recipes ..... 180 12

Introduction 3 1.1 Open Source 3 1.2 Decentralized package manager 3 1.3 Binary management 4 1.4 Cross platform, build system agnostic 5 1.5 Stable 5 2 Install 7 2.1 Install with pip (recommended) local cache: concurrency, Continuous Integration, isolation 105 10 Systems and cross building 107 10.1 Cross building 107 10.2 Windows Subsystems 115 11 Extending Conan 119 11.1 Python 13.7 How to manage C++ standard [EXPERIMENTAL] ..... 198 13.8 How to use docker to create and cross build C and C++ conan packages ..... 200 13.9 How to reuse Python code in recipes ..... 202 13

Introduction 3 1.1 Open Source 3 1.2 Decentralized package manager 3 1.3 Binary management 4 1.4 Cross platform, build system agnostic 5 1.5 Stable 5 2 Install 7 2.1 Install with pip (recommended) local cache: concurrency, Continuous Integration, isolation 104 10 Systems and cross building 107 10.1 Cross building 107 10.2 Windows Subsystems 115 11 Extending Conan 119 11.1 Python built from sources on the client machine to create a binary package matching their settings. ### 1.4 Cross platform, build system agnostic Conan works and is being actively used on Windows, Linux (Ubuntu

Introduction 3 1.1 Open Source 3 1.2 Decentralized package manager 3 1.3 Binary management 4 1.4 Cross platform, build system agnostic 5 1.5 Stable 5 2 Install 7 2.1 Install with pip (recommended) cache: concurrency, Continuous Integration, isolation ..... 104 10 Systems and cross building ..... 107 10.1 Cross building ..... 107 10.2 Windows Subsystems ..... 115 11 Extending Conan ..... built from sources on the client machine to create a binary package matching their settings. ### 1.4 Cross platform, build system agnostic Conan works and is being actively used on Windows, Linux (Ubuntu