The mlflow.projects module provides an API for running MLflow projects locally or remotely.

class mlflow.projects.SubmittedRun[source]

Bases: object

Wrapper around an MLflow project run (e.g. a subprocess running an entry point command or a Databricks job run) and exposing methods for waiting on and cancelling the run. This class defines the interface that the MLflow project runner uses to manage the lifecycle of runs launched in different environments (e.g. runs launched locally or on Databricks).

SubmittedRun is not thread-safe. That is, concurrent calls to wait() / cancel() from multiple threads may inadvertently kill resources (e.g. local processes) unrelated to the run.


Subclasses of SubmittedRun must expose a run_id member containing the run’s MLflow run ID.

abstract cancel()[source]

Cancel the run (interrupts the command subprocess, cancels the Databricks run, etc) and waits for it to terminate. The MLflow run status may not be set correctly upon run cancellation.

abstract get_status()[source]

Get status of the run.

abstract property run_id
abstract wait()[source]

Wait for the run to finish, returning True if the run succeeded and false otherwise. Note that in some cases (e.g. remote execution on Databricks), we may wait until the remote job completes rather than until the MLflow run completes., entry_point='main', version=None, parameters=None, docker_args=None, experiment_name=None, experiment_id=None, backend='local', backend_config=None, use_conda=True, storage_dir=None, synchronous=True, run_id=None)[source]

Run an MLflow project. The project can be local or stored at a Git URI.

MLflow provides built-in support for running projects locally or remotely on a Databricks or Kubernetes cluster. You can also run projects against other targets by installing an appropriate third-party plugin. See Community Plugins for more information.

For information on using this method in chained workflows, see Building Multistep Workflows.


mlflow.exceptions.ExecutionException If a run launched in blocking mode is unsuccessful.

  • uri – URI of project to run. A local filesystem path or a Git repository URI (e.g. pointing to a project directory containing an MLproject file.

  • entry_point – Entry point to run within the project. If no entry point with the specified name is found, runs the project file entry_point as a script, using “python” to run .py files and the default shell (specified by environment variable $SHELL) to run .sh files.

  • version – For Git-based projects, either a commit hash or a branch name.

  • parameters – Parameters (dictionary) for the entry point command.

  • docker_args – Arguments (dictionary) for the docker command.

  • experiment_name – Name of experiment under which to launch the run.

  • experiment_id – ID of experiment under which to launch the run.

  • backend – Execution backend for the run: MLflow provides built-in support for “local”, “databricks”, and “kubernetes” (experimental) backends. If running against Databricks, will run against a Databricks workspace determined as follows: if a Databricks tracking URI of the form databricks://profile has been set (e.g. by setting the MLFLOW_TRACKING_URI environment variable), will run against the workspace specified by <profile>. Otherwise, runs against the workspace specified by the default Databricks CLI profile.

  • backend_config – A dictionary, or a path to a JSON file (must end in ‘.json’), which will be passed as config to the backend. The exact content which should be provided is different for each execution backend and is documented at

  • use_conda – If True (the default), create a new Conda environment for the run and install project dependencies within that environment. Otherwise, run the project in the current environment without installing any project dependencies.

  • storage_dir – Used only if backend is “local”. MLflow downloads artifacts from distributed URIs passed to parameters of type path to subdirectories of storage_dir.

  • synchronous – Whether to block while waiting for a run to complete. Defaults to True. Note that if synchronous is False and backend is “local”, this method will return, but the current process will block when exiting until the local run completes. If the current process is interrupted, any asynchronous runs launched via this method will be terminated. If synchronous is True and the run fails, the current process will error out as well.

  • run_id – Note: this argument is used internally by the MLflow project APIs and should not be specified. If specified, the run ID will be used instead of creating a new run.


mlflow.projects.SubmittedRun exposing information (e.g. run ID) about the launched run.

import mlflow

project_uri = ""
params = {"alpha": 0.5, "l1_ratio": 0.01}

# Run MLflow project and create a reproducible conda environment
# on a local host, parameters=params)
Elasticnet model (alpha=0.500000, l1_ratio=0.010000):
RMSE: 0.788347345611717
MAE: 0.6155576449938276
R2: 0.19729662005412607
... mlflow.projects: === Run (ID '6a5109febe5e4a549461e149590d0a7c') succeeded ===