Machine learning is rampaging through the IT world, and driving a lot of high-end tech. It created a revolution of automation and flexibility for researchers and businesses.
When it comes to machine learning, workflows (or pipelines) are an essential component that drives the overall project.
In this article, we’ll explore what exactly workflows and pipelines are, and more than 10 tools that we can use to orchestrate workflows and pipelines.
What is a workflow in Machine Learning?
A workflow in ML is a sequence of tasks that runs subsequently in the machine learning process.
The workflows are the different phases of a machine learning project. These phases include:
- data collection,
- data pre-processing,
- building datasets,
- model training and refinement,
- deployment to production.
What are pipelines in Machine Learning?
Pipelines in machine learning are an infrastructural medium for the entire ML workflow. Pipelines help automate the overall MLOps workflow, from data gathering, EDA, data augmentation, to model building and deployment. After the deployment, it also supports reproduction, tracking, and monitoring.
ML pipelines help improve the performance and management of the entire model, resulting in quick and easy deployment.
What are Machine Learning orchestration tools?
Machine learning orchestration tools are used to automate and manage workflows and pipeline infrastructure, with a simple, collaborative interface. Along with management and creation of custom workflows and their pipelines, these tools also help us track and monitor models for further analysis.
Orchestration tools make the ML process easier, more efficient, and help data scientists and ML teams focus on what’s necessary, rather than waste resources trying to identify priority issues.
Orchestrating a proper workflow can be very useful for a company invested in machine learning. To do so, you must understand how to automate the entire, and how to extract valuable model output during production with monitoring and tracking.
So, to introduce some of the best tools for MLOps workflow/pipeline orchestration, we’ve compiled a list.
- Kale – Aims at simplifying the Data Science experience of deploying Kubeflow Pipelines workflows.
- Flyte – Easy to create concurrent, scalable, and maintainable workflows for machine learning.
- MLRun – Generic mechanism for data scientists to build, run, and monitor ML tasks and pipelines.
- Prefect – A workflow management system, designed for modern infrastructure.
- ZenML – An extensible open-source MLOps framework to create reproducible pipelines.
- Argo – Open source container-native workflow engine for orchestrating parallel jobs on Kubernetes.
- Kedro – Library that implements software engineering best-practice for data and ML pipelines.
- Luigi – Python module that helps you build complex pipelines of batch jobs.
- Metaflow – Human-friendly lib that helps scientists and engineers build and manage data science projects.
- Couler – Unified interface for constructing and managing workflows on different workflow engines.
- Valohai – Simple and powerful tool to train, evaluate and deploy models.
- Dagster.io – Data orchestrator for machine learning, analytics, and ETL.
- Netflix Genie – Genie developed by Netflix is an open-source distributed workflow/task orchestration framework.
When working with a Jupyter notebook, data scientists benefit from interactivity and visualizations. After finishing a task, refactoring the notebook to manage Kubeflow Pipelines can be difficult and time-consuming.
Kale solves this problem. It’s a tool that simplifies the deployment process of Jupyter Notebooks into Kubeflow Pipelines workflows. It translates a Jupyter Notebook directly into a KFP pipeline. In doing so, it ensures that all the processing building blocks are well-organized and independent from each other. It also leverages the power of experiment tracking and workflow organization, provided out-of-the-box by Kubeflow.
It offers a platform to control and coordinate complex workflows on top of Kubernetes. Plus, you can create reusable components, and execute them along with workflows. With a simple UI for defining KFP pipelines directly from the JupyterLab interface, the tool is very efficient and effective for workflow pipeline orchestration.
- Focus on: Kubeflow pipeline & workflow
Another high-end tool to easily create ML workflows. It’s a structured programming and distributed processing platform, with highly concurrent, scalable, and maintainable workflows for machine learning and data processing.
It already manages over 10,000 workflows. The stellar infrastructure lets you create an isolated repo, deploy, and scale without affecting the rest of the platform. It’s built on top of Kubernetes, and offers portability, scalability, and reliability.
Flyte’s interface is elastic, intuitive, and easy to use for multiple tenants. It offers parameters, data lineage, and caching for organizing your workflows.
The overall platform is dynamic and extensible, and offers a wide variety of plugins to assist workflow creation and deployment. Workflows can be reiterated, rolled back, experimented with, and shared to speed up the development process for the whole team.
- Focus on: Creating concurrent, scalable, and maintainable workflows
MLRun is an open-source workflow/pipeline orchestration tool. It has an integrative approach to organizing machine-learning pipelines, from initial development, through model building, all the way to full pipeline deployment in production.
It summons an abstraction layer, integrated with a wide range of ML tools and plugins for working with features and models along with workflow deployment. MLRun has a feature and artifact store to control ingestion, processing, metadata, and storage of data across multiple repositories and technologies.
It has an elastic server-less service for converting simple code into scalable and organized microservices. It also facilitates automated experiments, model training and testing, and deployment of real-time pipeline workflows.
The overall UI has a centralized structure to manage ML workflows. Key features include rapid deployment, elastic scaling, feature management, and flexible usability.
- Focus on: end-to-end ML pipelines
I believe that this is one of the best automated workflow management tools out there. Built for modern infrastructure, on top of an open-source Prefect Core workflow engine.
This workflow management system makes it easy to take data pipelines and add semantics, like retries, logging, dynamic mapping, caching, or failure notifications.
It facilitates two ready-to-use databases:
- Prefect Core’s server,
- Prefect Cloud.
They have UI backends that automatically extend the Prefect Core engine with a rich GraphQL API, to make workflow orchestration simple. Prefect Core’s server is an open-source, lightweight alternative to Prefect Cloud.
Prefect Cloud is a fully-hosted, deployment-ready backend for Prefect Core. It has enhanced features, like permissions and authorization, performance enhancements, agent monitoring secure runtime secrets and parameters, team management, or SLAs. Everything is automated, you just need to translate tasks into workflows and this tool will handle the rest.
- Focus on: end-to-end ML pipelines
ZenML is a popular open-source MLOps tool for creating reproducible workflows. It was built to solve the issue of translating observed patterns from Jupyter notebook research into a production-ready ML environment.
The tool focuses on production-based replication issues, such as versioning difficulties and models, reproducing experiments, organizing complex ML workflows, bridge training, deployment, and tracking metadata. It can work alongside other workflow orchestration tools to provide a simple path to getting your ML model into production.
At its core, ZenML breaks down ML development into steps representing individual tasks. The sequence of tasks operated together forms a workflow pipeline. You can leverage integrations, and switch seamlessly between local and cloud systems.
You can accurately version data, models, and configurations. It automatically detects the database schema, and lets you view statistics. It lets you evaluate the model (using built-in evaluators), compare training pipelines, and distribute preprocessing to the cloud.
- Focus on: creating production-ready ML pipelines
Argo is a powerful, container-native, open-source workflow engine. It’s great for orchestrating parallel jobs on Kubernetes. It’s been implemented as a Custom Resource Definition of Kubernetes. You can define pipeline workflows, where individual steps are taken as a container.
It lets you model multi-step workflows as a sequence of tasks. Also, Argo supports dependency tracking between tasks, thanks to a directed acyclic graph (DAG). It can easily handle intensive tasks for machine learning and data science, saving you a lot of time.
Argo has CI/CD configured directly on Kubernetes, you don’t have to plug in any other software. It’s cloud-agnostic, runs on any Kubernetes cluster, and enables easy orchestration of highly parallel jobs on Kubernetes.
- Focus on: Kubernetes
This workflow orchestration tool is based on Python. You can create reproducible, maintainable, and modular workflows to make your ML processes easier and more accurate. Kedro integrates software engineering into a machine learning environment, with concepts like modularity, separation of concerns, and versioning.
It offers a standard, modifiable project template based on Cookiecutter Data Science. The data catalog handles a series of lightweight data connectors, used to save and load data across many different file formats and file systems.
With pipeline abstraction, you can automate dependencies between Python code and workflow visualization. Kedro supports single- or distributed-machine deployment. The main focus is creating maintainable data science code to address the shortcomings of Jupyter notebooks, one-off scripts, and glue-code. This tool makes team collaboration easier at various levels, and provides efficiency in the coding environment with modular, reusable code.
- Focus on: reproduction, modularity, and maintainable
Luigi is an open-source Python package, optimized for workflow orchestration to perform batch tasks. With Luigi, it’s easier to build complex pipelines. It offers different services to control dependency resolution and workflow management. It also supports visualization, failure handling, and command line integration.
It mainly addresses long-running complex batch processes. Luigi takes care of all workflow management tasks that may take a long time to finish, so that we can focus on actual tasks and their dependencies. It has a toolbox with common project templates.
Luigi has state-of-the-art file system abstractions for HDFS and local files. This way, all file system operations are atomic. So, if you’re looking for an all-Python tool that handles workflow management for batch job processing, then Luigi is for you.
- Focus on: building complex pipelines for batch jobs.
Metaflow is a powerful and modern workflow management tool built for demanding data science and machine learning projects. It simplifies and speeds up the implementation and management of data science projects. We can generate models using any Python-related tool. This framework also has support for the R language.
You can design your workflow, run it at scale, and deploy it to production. Metaflow has automatic versioning and tracking for all experiments and data. There’s built-in support to scale quickly and easily. It’s integrated with AWS cloud, which provides support for storage, computation, and machine learning services.
It has a unified API to the infrastructure, essential to execute data science projects from start to deployment. It focuses on usability and ergonomics. There’s also code entropy management and a collaboration platform.
- Focus on: manage real-life data science projects
The only workflow orchestration tool for managing other workflow orchestration tools. Couler has a state-of-the-art unified interface for coding and managing workflows with different workflow engines and frameworks.
Different engines, like Argo Workflows, Tekton Pipelines or Apache Airflow, have varying, complex levels of abstractions. Couler’s common interface makes it easier to manage these different levels of abstractions.
It has an imperative programming style for defining workflows, and support for automatic construction of a directed acyclic graph. Couler services are highly extensible, supporting other workflow engines. It facilitates distributed training for ML models, ensuring modularity and reusability. Couler supports automated workflows and resource organization for optimal performance.
- Focus on: management of other tools
If you’re looking for an MLOps tool to automate everything from data extraction and preparation, to model deployment in production, then this tool might become your new favorite.
With Valohai you can train, evaluate, and deploy models conveniently, without added manual work, and also repeat the process automatically. It supports an end-to-end machine learning workflow storing every model, experiment, and artifact automatically. After deployment, it also monitors deployed models in the Kubernetes cluster.
Valohai is a stable environment and UI interface, with just enough computing resources. You can manage your custom model instead of spending time on infrastructure and manual experiment tracking. It speeds up your work, and also supports automatic data, model, and experiment versioning.
It includes a very stable MLOps environment that adapts to any framework and language. It can do hyperparameter sweeps, simplify team collaboration, experiment and model auditing, and it’s secure with a firewall.
- Premium, no free plans
- Focus on: end-to-end ML pipelines.
Dagster has a rich UI to perform workflow orchestration for machine learning, analytics, and ETL (Extract, Transform, Load).
You can build computation pipelines written in Spark, SQL, DBT, or any other framework. The platform lets you deploy the pipeline locally, or on Kubernetes. You can even create your own custom infrastructure for deployment.
Dagster shows you pipelines, tables, ML models, and other assets in a unified view. It provides an asset manager tool for tracking workflow results. It lets teams build custom self-service systems.
The web interface (Dagit) lets anyone inspect created task objects, and explore their properties. It eases the dependency nightmare. The codebases are isolated by repository models, preventing the problem of one workflow affecting another.
- Premium, no free plans
- Focus on: end-to-end ML pipelines.
Genie is an open-source distributed workflow/task orchestration framework. It has APIs for executing different machine learning big data tasks, like Hadoop, Pig, or Hive. It offers centralized and scalable resource management for computing resources.
There are APIs for monitoring workflows on clusters, without installing any computational resources. It takes away the manual work of having to install computation resources yourself. It servers configurations APIs to register clusters and applications that run Genie.
Genie’s major advantage is scalability. It can house multiple machines depending on increasing and decreasing workload. The server APIs manage the metadata and commands of many distributed processing clusters.
- Focus on: big Data orchestration.
Now that you know some of the best MLOps workflow/pipeline orchestration tools, you can choose the right one for your ML project. Each tool has distinct advantages. Most of them are open-source, so you can test them without any financial commitment.
Automatic processes, scalability, unified design, global plugin integrations, and much more – the features that these tools provide make it easier to drive stellar results in machine learning projects. From the initial process of data extraction and experiment to deployment in production, these tools can make things easier and more accurate.
The Best MLOps Tools You Need to Know as a Data Scientist
7 mins read | Jakub Czakon | Posted July 24, 2020
In one of our articles—The Best Tools, Libraries, Frameworks and Methodologies that Machine Learning Teams Actually Use – Things We Learned from 41 ML Startups—Jean-Christophe Petkovich, CTO at Acerta, explained how their ML team approaches MLOps.
According to him, there are several ingredients for a complete MLOps system:
- You need to be able to build model artifacts that contain all the information needed to preprocess your data and generate a result.
- Once you can build model artifacts, you have to be able to track the code that builds them, and the data they were trained and tested on.
- You need to keep track of how all three of these things, the models, their code, and their data, are related.
- Once you can track all these things, you can also mark them ready for staging, and production, and run them through a CI/CD process.
- Finally, to actually deploy them at the end of that process, you need some way to spin up a service based on that model artifact.
It’s a great high-level summary of how to successfully implement MLOps in a company. But understanding what is needed in high-level is just a part of the puzzle. The other one is adopting or creating proper tooling that gets things done.
That’s why we’ve compiled a list of the best MLOps tools. We’ve divided them into six categories so you can choose the right tools for your team and for your business. Let’s dig in!Continue reading ->