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Installation

Requirements

First of all, to manage environment, we recommend using conda:

conda create -n mirorl python==3.10.4
conda activate mirorl

For prerequisites installation (CUDA, cuDNN, Apex), we recommend following the verl prerequisites guide which provides detailed instructions for:

  • CUDA: Version >= 12.4
  • cuDNN: Version >= 9.8.0
  • Apex

Install Dependencies

Install python dependencies

For python dependencies installation (sglang, flash-attn, flashinfer), execute the install.sh script that we provided in mirorl/scripts:

# Make sure you have activated verl conda env
# only for FSDP backend and sglang engine
bash scripts/install.sh

If you encounter errors in this step, please check the script and manually follow the steps in the script.

Install Node.js for MCP Support

MCP (Model Context Protocol) requires Node.js to run MCP servers. Node.js version 18+ is recommended for optimal compatibility with MCP tools.

# Download Node.js binary (example for Linux x64)
wget https://nodejs.org/dist/v24.2.0/node-v24.2.0-linux-x64.tar.xz

# Extract to your target path
tar -xf node-v24.2.0-linux-x64.tar.xz -C /your/target/path

# Add to PATH
export NODEJS_HOME=/your/target/path/node-v24.2.0-linux-x64
export PATH=$NODEJS_HOME/bin:$PATH
export NODE_SHARED=/your/target/path/node-shared/node_modules
export PATH=$NODE_SHARED/.bin:$PATH

# Verify installation
node --version
npm --version

# Install serper mcp server
mkdir -p /your/target/path/node-shared
cd /your/target/path/node-shared
npm init -y
npm install serper-search-scrape-mcp-server

Install verl

For installing the target version of verl, the best way is to clone and install it from source.

git clone https://github.com/MiroMindAsia/mirorl.git --recursive
cd mirorl/verl
pip install --no-deps -v .