mlflow v1.9.0


Monthly downloads



Interface to 'MLflow'

R interface to 'MLflow', open source platform for the complete machine learning life cycle, see <>. This package supports installing 'MLflow', tracking experiments, creating and running projects, and saving and serving models.


mlflow: R interface for MLflow

Status CRAN\_Status\_Badge codecov

  • Install MLflow from R to track experiments locally.
  • Connect to MLflow servers to share experiments with others.
  • Use MLflow to export models that can be served locally and remotely.


Install mlflow followed by installing the mlflow runtime as follows:

devtools::install_github("mlflow/mlflow", subdir = "mlflow/R/mlflow")

Notice also that Anaconda or Miniconda need to be manually installed.


Install the mlflow package as follows:

devtools::install_github("mlflow/mlflow", subdir = "mlflow/R/mlflow")

Then install the latest released mlflow runtime.

# Install latest released version

However, currently, the development runtime of mlflow is also required; which means you also need to download or clone the mlflow GitHub repo:

git clone

And upgrade the runtime to the development version as follows:

# Upgrade to the latest development version
reticulate::conda_install("r-mlflow", "<local github repo>", pip = TRUE)


MLflow Tracking allows you to logging parameters, code versions, metrics, and output files when running R code and for later visualizing the results.

MLflow allows you to group runs under experiments, which can be useful for comparing runs intended to tackle a particular task. You can create and activate a new experiment locally using mlflow as follows:


Then you can list view your experiments from MLflows user interface by running:


You can also use a MLflow server to track and share experiments, see running a tracking server, and then make use of this server by running:


Once the tracking url is defined, the experiments will be stored and tracked in the specified server which others will also be able to access.


An MLflow Project is a format for packaging data science code in a reusable and reproducible way.

MLflow projects can be explicitly created or implicitly used by running R with mlflow from the terminal as follows:

mlflow run examples/r_wine --entry-point train.R

Notice that is equivalent to running from examples/r_wine,

Rscript -e "mlflow::mlflow_source('train.R')"

and train.R performing training and logging as follows:


# read parameters
column <- mlflow_log_param("column", 1)

# log total rows
mlflow_log_metric("rows", nrow(iris))

# train model
model <- lm(
  Sepal.Width ~ x,
  data.frame(Sepal.Width = iris$Sepal.Width, x = iris[,column])

# log models intercept
mlflow_log_metric("intercept", model$coefficients[["(Intercept)"]])


You will often want to parameterize your scripts to support running and tracking multiple experiments. Ypu can define parameters with type under a params_example.R example as follows:


# define parameters
my_int <- mlflow_param("my_int", 1, "integer")
my_num <- mlflow_param("my_num", 1.0, "numeric")

# log parameters
mlflow_log_param("param_int", my_int)
mlflow_log_param("param_num", my_num)

Then run mlflow run with custom parameters as follows

mlflow run tests/testthat/examples/ --entry-point params_example.R -P my_int=10 -P my_num=20.0 -P my_str=XYZ

=== Created directory /var/folders/ks/wm_bx4cn70s6h0r5vgqpsldm0000gn/T/tmpi6d2_wzf for downloading remote URIs passed to arguments of type 'path' ===
=== Running command 'source /miniconda2/bin/activate mlflow-da39a3ee5e6b4b0d3255bfef95601890afd80709 && Rscript -e "mlflow::mlflow_source('params_example.R')" --args --my_int 10 --my_num 20.0 --my_str XYZ' in run with ID '191b489b2355450a8c3cc9bf96cb1aa3' === 
=== Run (ID '191b489b2355450a8c3cc9bf96cb1aa3') succeeded ===

Run results that we can view with mlflow_ui().


An MLflow Model is a standard format for packaging machine learning models that can be used in a variety of downstream tools—for example, real-time serving through a REST API or batch inference on Apache Spark. They provide a convention to save a model in different “flavors” that can be understood by different downstream tools.

To save a model use mlflow_save_model(). For instance, you can add the following lines to the previous train.R script:

# train model (...)

# save model
  crate(~ stats::predict(model, .x), model)

And trigger a run with that will also save your model as follows:

mlflow run train.R

Each MLflow Model is simply a directory containing arbitrary files, together with an MLmodel file in the root of the directory that can define multiple flavors that the model can be viewed in.

The directory containing the model looks as follows:

## [1] "crate.bin" "MLmodel"

and the model definition model/MLmodel like:

cat(paste(readLines("model/MLmodel"), collapse = "\n"))
## flavors:
##   crate:
##     version: 0.1.0
##     model: crate.bin
## time_created: 18-10-03T22:18:25.25.55
## run_id: 4286a3d27974487b95b19e01b7b3caab

Later on, the R model can be deployed which will perform predictions using mlflow_rfunc_predict():

mlflow_rfunc_predict("model", data = data.frame(x = c(0.3, 0.2)))
## Warning in mlflow_snapshot_warning(): Running without restoring the
## packages snapshot may not reload the model correctly. Consider running
## 'mlflow_restore_snapshot()' or setting the 'restore' parameter to 'TRUE'.

## 3.400381396714573.40656987651099

##        1        2 
## 3.400381 3.406570


MLflow provides tools for deployment on a local machine and several production environments. You can use these tools to easily apply your models in a production environment.

You can serve a model by running,

mlflow rfunc serve model

which is equivalent to running,

Rscript -e "mlflow_rfunc_serve('model')"

You can also run:

mlflow rfunc predict model data.json

which is equivalent to running,

Rscript -e "mlflow_rfunc_predict('model', 'data.json')"


When running a project, mlflow_snapshot() is automatically called to generate a r-dependencies.txt file which contains a list of required packages and versions.

However, restoring dependencies is not automatic since it’s usually an expensive operation. To restore dependencies run:


Notice that the MLFLOW_SNAPSHOT_CACHE environment variable can be set to a cache directory to improve the time required to restore dependencies.


To enable fast iteration while tracking with MLflow improvements over a model, RStudio 1.2.897 an be configured to automatically trigger mlflow_run() when sourced. This is enabled by including a # !source mlflow::mlflow_run comment at the top of the R script as follows:


See the MLflow contribution guidelines.

Functions in mlflow

Name Description
mlflow_delete_run Delete a Run
mlflow_delete_tag Delete Tag
mlflow_client Initialize an MLflow Client
install_mlflow Install MLflow
mlflow_create_experiment Create Experiment
mlflow_delete_experiment Delete Experiment
mlflow_end_run End a Run
mlflow_download_artifacts Download Artifacts
mlflow-package mlflow: Interface to 'MLflow'
mlflow_get_experiment Get Experiment
mlflow_get_tracking_uri Get Remote Tracking URI
mlflow_restore_experiment Restore Experiment
mlflow_rename_experiment Rename Experiment
mlflow_set_experiment Set Experiment
mlflow_id Get Run or Experiment ID
mlflow_set_experiment_tag Set Experiment Tag
mlflow_run Run an MLflow Project
mlflow_get_metric_history Get Metric History
mlflow_log_model Log Model
mlflow_get_run Get Run
mlflow_log_param Log Parameter
mlflow_list_run_infos List Run Infos
mlflow_list_artifacts List Artifacts
mlflow_load_model Load MLflow Model
mlflow_load_flavor Load MLflow Model Flavor
mlflow_ui Run MLflow User Interface
mlflow_save_model.crate Save Model for MLflow
mlflow_server Run MLflow Tracking Server
mlflow_search_runs Search Runs
mlflow_param Read Command-Line Parameter
reexports Objects exported from other packages
mlflow_predict Generate Prediction with MLflow Model
mlflow_log_artifact Log Artifact
mlflow_rfunc_serve Serve an RFunc MLflow Model
mlflow_restore_run Restore a Run
mlflow_set_tracking_uri Set Remote Tracking URI
mlflow_set_tag Set Tag
mlflow_list_experiments List Experiments
mlflow_log_batch Log Batch
mlflow_source Source a Script with MLflow Params
mlflow_log_metric Log Metric
mlflow_start_run Start Run
uninstall_mlflow Uninstall MLflow
No Results!

Last month downloads


Type Package
License Apache License 2.0
SystemRequirements MLflow (
Encoding UTF-8
LazyData true
NeedsCompilation no
Packaged 2020-06-22 18:51:44 UTC; jenkins
Repository CRAN
Date/Publication 2020-06-22 19:40:02 UTC

Include our badge in your README