replicate/cog

replicate/cog

Description: Containers for machine learning

Language: Go

License: Apache-2.0

Stars: 9422

Forks: 692

Open issues: 362

Created: 2021-02-26T23:43:09Z

Pushed: 2026-06-11T00:39:39Z

Default branch: main

Fork: no

Archived: no

README:

Cog: Containers for machine learning

Cog is an open-source tool that lets you package machine learning models in a standard, production-ready container.

You can deploy your packaged model to your own infrastructure, or to Replicate.

Highlights

• 📦 Docker containers without the pain. Writing your own Dockerfile can be a bewildering process. With Cog, you define your environment with a [simple configuration file](#how-it-works) and it generates a Docker image with all the best practices: Nvidia base images, efficient caching of dependencies, installing specific Python versions, sensible environment variable defaults, and so on.

• 🤬️ No more CUDA hell. Cog knows which CUDA/cuDNN/PyTorch/Tensorflow/Python combos are compatible and will set it all up correctly for you.

• ✅ Define the inputs and outputs for your model with standard Python. Then, Cog generates an OpenAPI schema and validates the inputs and outputs.

• 🎁 Automatic HTTP inference server: Your model's types are used to dynamically generate a RESTful HTTP API using a high-performance Rust/Axum server.

• 🚀 Ready for production. Deploy your model anywhere that Docker images run. Your own infrastructure, or Replicate.

How it works

Define the Docker environment your model runs in with cog.yaml:

build:
gpu: true
system_packages:
- "libgl1"
- "libglib2.0-0"
python_version: "3.13"
python_requirements: requirements.txt
run: "run.py:Runner"

Define how your model runs with run.py:

from cog import BaseRunner, Input, Path
import torch

class Runner(BaseRunner):
def setup(self):
"""Load the model into memory to make running multiple inferences efficient"""
self.model = torch.load("./weights.pth")

# The arguments and types the model takes as input
def run(self,
image: Path = Input(description="Grayscale input image")
) -> Path:
"""Run the model"""
processed_image = preprocess(image)
output = self.model(processed_image)
return postprocess(output)

In the above we accept a path to the image as an input, and return a path to our transformed image after running it through our model.

Now, you can run the model:

$ cog run -i image=@input.jpg
--> Building Docker image...
--> Running...
--> Output written to output.jpg

Or, build a Docker image for deployment:

$ cog build -t my-classification-model
--> Building Docker image...
--> Built my-classification-model:latest

$ docker run -d -p 5000:5000 --gpus all my-classification-model

$ curl http://localhost:5000/predictions -X POST \
-H 'Content-Type: application/json' \
-d '{"input": {"image": "https://.../input.jpg"}}'

Or, combine build and run via the serve command:

$ cog serve -p 8080

$ curl http://localhost:8080/predictions -X POST \
-H 'Content-Type: application/json' \
-d '{"input": {"image": "https://.../input.jpg"}}'

Why are we building this?

It's really hard for researchers to ship machine learning models to production.

Part of the solution is Docker, but it is so complex to get it to work: Dockerfiles, pre-/post-processing, Flask servers, CUDA versions. More often than not the researcher has to sit down with an engineer to get the damn thing deployed.

Andreas and Ben created Cog. Andreas used to work at Spotify, where he built tools for building and deploying ML models with Docker. Ben worked at Docker, where he created Docker Compose.

We realized that, in addition to Spotify, other companies were also using Docker to build and deploy machine learning models. Uber and others have built similar systems. So, we're making an open source version so other people can do this too.

Hit us up if you're interested in using it or want to collaborate with us. We're on Discord or email us at [team@replicate.com](mailto:team@replicate.com).

Prerequisites

• macOS, Linux or Windows 11. Cog works on macOS, Linux and Windows 11 with [WSL 2](docs/wsl2/wsl2.md)
• Docker. Cog uses Docker to create a container for your model. You'll need to install Docker before you can run Cog. If you install Docker Engine instead of Docker Desktop, you will need to install Buildx as well.

Install

If you're using macOS, you can install Cog using Homebrew:

brew install replicate/tap/cog

You can also download and install the latest release using our install script:

# bash, zsh, and other shells
sh


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