error: can't find Rust compiler
      
    If you are using an outdated pip version, it is possible a prebuilt wheel is available for this package but pip is not able to install from it. Installing from the wheel would avoid the need for a Rust compiler.
      
    To update pip, run:
      
        pip install --upgrade pip
      
    and then retry package installation.
      
    If you did intend to build this package from source, try installing a Rust compiler from your system package manager and ensure it is on the PATH during installation. Alternatively, rustup (available at https://rustup.rs) is the recommended way to download and update the Rust compiler toolchain.
    [end of output]
  
note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for tokenizers
Failed to build tokenizers
ERROR: Could not build wheels for tokenizers, which is required to install pyproject.toml-based projects

问题描述：

当我下载transformers/spacy库的时候报了如上的错误。

解决办法：

1.安装Rust
（1）使用命令

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

（2）选择默认安装

1) Proceed with installation (default)
2) Customize installation
3) Cancel installation
>1

（3）安装完成，使用命令查看Rust版本

rustc --version

2.pip3 install tranformers==x.x.x

(x.x.x为版本号)

PS_1：若Rust版本查看不了，则使用如下命令或查看官网

source $HOME/.cargo/env

PS_2：若pip install报错，可以尝试修改python版本（我原来是3.9，换成3.8之后成功运行）