R用户的福音︱TensorFlow:TensorFlow的R接口
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TensorFlow
TensorFlow™ is an open source software library for numerical computation using data flow graphs. Nodes in the graph represent mathematical operations, while the graph edges represent the multidimensional data arrays (tensors) communicated between them. The flexible architecture allows you to deploy computation to one or more CPUs or GPUs in a desktop, server, or mobile device with a single API. TensorFlow was originally developed by researchers and engineers working on the Google Brain Team within Google’s Machine Intelligence research organization for the purposes of conducting machine learning and deep neural networks research, but the system is general enough to be applicable in a wide variety of other domains as well.
Using TensorFlow with R
The TensorFlow API is composed of a set of Python modules that enable constructing and executing TensorFlow graphs. The tensorflow package provides access to the complete TensorFlow API from within R. Here’s a simple example of making up some data in two dimensions and then fitting a line to it:
library(tensorflow)# Create 100 phony x, y data points, y = x * 0.1 + 0.3x_data <- runif(100, min=0, max=1)y_data <- x_data * 0.1 + 0.3# Try to find values for W and b that compute y_data = W * x_data + b# (We know that W should be 0.1 and b 0.3, but TensorFlow will# figure that out for us.)W <- tf$Variable(tf$random_uniform(shape(1L), -1.0, 1.0))b <- tf$Variable(tf$zeros(shape(1L)))y <- W * x_data + b# Minimize the mean squared errors.loss <- tf$reduce_mean((y - y_data) ^ 2)optimizer <- tf$train$GradientDescentOptimizer(0.5)train <- optimizer$minimize(loss)# Launch the graph and initialize the variables.sess = tf$Session()sess$run(tf$initialize_all_variables())# Fit the line (Learns best fit is W: 0.1, b: 0.3)for (step in 1:201) { sess$run(train) if (step %% 20 == 0) cat(step, "-", sess$run(W), sess$run(b), "\n")}
The first part of this code builds the data flow graph. TensorFlow does not actually run any computation until the session is created and the run
function is called.
MNIST Tutorials
To whet your appetite further, we suggest you check out what a classical machine learning problem looks like in TensorFlow. In the land of neural networks the most “classic” classical problem is the MNIST handwritten digit classification. We offer two introductions here, one for machine learning newbies, and one for pros. If you’ve already trained dozens of MNIST models in other software packages, please take the red pill. If you’ve never even heard of MNIST, definitely take the blue pill. If you’re somewhere in between, we suggest skimming blue, then red.
Images licensed CC BY-SA 4.0; original by W. Carter
If you’re already sure you want to learn and install TensorFlow you can skip these and charge ahead. Don’t worry, you’ll still get to see MNIST – we’ll also use MNIST as an example in our technical tutorial where we elaborate on TensorFlow features.
Download and Setup
Installing TensorFlow
You can install the main TensorFlow distribution from here:
https://www.tensorflow.org/get_started/os_setup.html#download-and-setup
NOTE: You should NOT install TensorFlow with Anaconda as there are issues with the way Anaconda builds the python shared library that prevent dynamic linking from R.
If you install TensorFlow within a Virtualenv environment you’ll need to be sure to use that same environment when installing the tensorflow R package (see below for details).
Installing the R Package
If you installed TensorFlow via pip with your system default version of python then you can install the tensorflow R package as follows:
devtools::install_github("rstudio/tensorflow")
If you are using a different version of python for TensorFlow, you should set the TENSORFLOW_PYTHON
environment variable to the full path of the python binary before installing, for example:
Sys.setenv(TENSORFLOW_PYTHON="/usr/local/bin/python")devtools::install_github("rstudio/tensorflow")
If you only need to customize the version of python used (for example specifing python 3 on an Ubuntu system), you can set theTENSORFLOW_PYTHON_VERSION
environment variable before installation:
Sys.setenv(TENSORFLOW_PYTHON_VERSION = 3)devtools::install_github("rstudio/tensorflow")
Verifying Installation
You can verify that your installation is working correctly by running this script:
library(tensorflow)sess = tf$Session()hello <- tf$constant('Hello, TensorFlow!')sess$run(hello)
RStudio IDE
The tensorflow package provides code completion and inline help for the TensorFlow API when running within the RStudio IDE. In order to take advantage of these features you should also install the current Preview Release of RStudio.
Recommended Next Steps
Once you’ve installed the base TensorFlow system and the tensorflow R package, you will likely want work though the series of tutorials that cover TensorFlow basics:
- MNIST For ML Beginners
- Deep MNIST for Experts
- TensorFlow Mechanics 101
These articles cover the core concepts of TensorFlow in more depth as well describe the details of using the TensorFlow API from R:
- TensorFlow API Basic Usage
- Using the TensorFlow API from R
These articles provide more in depth treatments of various topics:
- Variables: Creation, Initialization, Saving, and Loading
- TensorFlow Mechanics 101
- TensorBoard: Visualizing Learning
- TensorBoard: Graph Visualization
Finally, to learn more about neural networks you might enjoy the TensorFlow playground, which lets you tinker with a neural network in your browser.
网友尝鲜:在Rstudio运用R实现Tensorflow的一般步骤
按照TensorFlow for R官网说明,运用R实现Tensorflow主要包含4步(如下),其中关键步骤在于安装好Tensorflow以及tensorflow R 包与python的连接。
从TensorFlow官网安装TensorFlow.
安装tensorflow R 包
devtools::install_github("rstudio/tensorflow")
载入TensorFlow
Sys.setenv(TENSORFLOW_PYTHON="/usr/local/bin/python")
library(tensorflow)
验证安装
library(tensorflow)
sess = tf$Session()
hello <- tf$constant('Hello, TensorFlow!')
sess$run(hello)
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