无法在R中安装keras包：调用库时提示无该包的问题求助

Let's break down the possible reasons and fixes for this issue:

1. The keras installation didn’t complete successfully (most common) #

When using devtools::install_github(), network interruptions or missing dependency packages can cause the installation to fail silently (or with errors you might have missed).

• Fix: Re-run the installation command and pay close attention to the console output:

  devtools::install_github("rstudio/keras")
  

  Look for lines starting with Error — if a specific dependency package fails to install, manually install that package first with install.packages("dependency_name"), then try installing keras again.

2. keras was installed to a library path R doesn’t check by default #

Sometimes devtools installs packages to a non-standard library path that R isn’t configured to look in.

• Fix:
  1. Check your current R library paths with:

     .libPaths()
     

  2. Verify if keras exists in any of these paths:

     find.package("keras", quiet = TRUE)
     

  3. If it returns nothing, re-install keras to one of your default library paths explicitly:

     devtools::install_github("rstudio/keras", lib = .libPaths()[1])
     

3. Your devtools version is outdated #

Older versions of devtools might have bugs that prevent proper installation from GitHub.

• Fix: Update devtools first, then reinstall keras:

  install.packages("devtools")
  devtools::install_github("rstudio/keras")
  

4. Permission issues blocked the installation #

On Windows, you might lack admin rights to write to the system-wide R library. On Linux/macOS, you might not have write permissions for the default library directory.

• Fix:
  • Windows: Right-click R/RStudio and select "Run as administrator", then re-run the installation commands.
  • Linux/macOS: Install keras to a user-specific library path (you’ll have write access here):

    devtools::install_github("rstudio/keras", lib = "~/R/library")
    

    Then add this path to your R library paths permanently by adding .libPaths("~/R/library") to your .Rprofile file.

内容的提问来源于stack exchange，提问作者Denmla