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The following page provides an overview of the basic Pythonic interface to ClearML Models.

ClearML provides the following classes to work with models:

  • Model - Represents a ClearML model, regardless of any task connection. Use this class to programmatically access and manage the ClearML model store.
  • InputModel - Represents a ClearML model to be used in an experiment. Use this class to load a model from ClearML's model store or to import a pre-trained model from an external resource to use as an experiment's initial starting point.
  • OutputModel - Represents an experiment's output model (training results). An OutputModel is always connected to a task, so the models are traceable to experiments.

Output Models

Manually Logging Models

To manually log a model, create an instance of OutputModel class.

from clearml import OutputModel, Task

# Instantiate a Task
task = Task.init(project_name="myProject", task_name="myTask")

# Create an output model for the PyTorch framework
output_model = OutputModel(task=task, framework="PyTorch")

You can set the destination the model will be uploaded to and its label enumeration using the OutputModel.set_upload_destination and OutputModel.update_labels methods respectively.

# Set the URI of the storage destination for uploaded model weight files

# Set the label numeration
output_model.update_labels({'background': 0, 'label': 255})

Updating Models

ClearML doesn't automatically log the snapshots of manually logged models. To update an experiment's model use the OutputModel.update_weights method.

# If validation shows this network is the best so far, update the output model
if val_log['iou'] > best_iou:
  • Specify either the path of a local weights file to upload (weights_filename), or the network location of a remote weights file (registered_uri).
  • Use the upload_uri argument to explicitly specify an upload destination for the weights file.
  • Model metadata
    • update_comment - update the model's description
    • iteration - input the iteration number

Alternatively, update a model through its associated task, using the Task.update_output_model method.

Input Models

Using Registered Models

To use a ClearML model as an input model, create an InputModel object and connect it to a task.

# Create an input model using the ClearML ID of a model already registered in the ClearML platform
input_model = InputModel(model_id="fd8b402e874549d6944eebd49e37eb7b")

# Connect the input model to the task

Importing Models

To import an existing model, use the InputModel.import_model class method and specify the weights_url - the URL for the imported model. If the URL already exists in the ClearML server, it is reused. Otherwise, a new model is registered.

Then connect the model to a task.

# Instantiate a Task 
task = Task.init(project_name="examples", task_name="example task")

input_model = InputModel.import_model(
# Name for model in ClearML
name='Input Model with Network Design',
# Import the model using a URL
# Set label enumeration values
label_enumeration={'person' : 1, 'car' : 2, 'truck' : 3, 'bus' : 4,
'motorcycle' : 5, 'bicycle' : 6, 'ignore': -1},

# Connect the input model to the task

Accessing Models

Querying Models

Retrieve a list of model objects by querying the system by model names, projects, tags, and more, using the Model.query_models and/or the InputModel.query_models class methods. These methods return a list of model objects that match the queries. The list is ordered according to the models' last update time.

model_list = Model.query_models(
# Only models from `examples` project
# Only models with input name
# Only models with `demo` tag or models without `TF` tag
tags=['demo', '-TF'],
# If `True`, only published models
# If `True`, include archived models
# Maximum number of models returned
# Only models with matching metadata

Tag Filters

The tags field supports advanced queries through combining tag names and operators into a list.

The supported operators are:

  • not
  • and
  • or

Input the operators in the following format: "__$<op>". To exclude a tag, you can also use the - prefix before the tag name, unless the tag name begins with the dash character (-), in which case you can use "__$not".

The or, and and operators apply to all tags that follow them until another operator is specified. The not operator applies only to the immediately following tag.

The default operator for a query is or, unless and is placed at the beginning of the query.


  • The following query will return models that have at least one of the provided tags, since the default operator is or ("a" OR "b" OR "c")

    model_list = Model.query_models(tags=["a", "b", "c"])
  • The following query will return models that have all three provided tags, since the and operator was placed in the beginning of the list, making it the default operator ("a" AND "b" AND "c").

    model_list = Model.query_models(tags=["__$and", "a", "b", "c"])
  • The following query will return models that have neither tag a nor tag c, but do have tag b (NOT "a" AND "b" AND NOT "c").

    model_list = Model.query_models(tags=["__$not", "a", "b", "__$not" "c"])
  • The following query will return models with either tag a or tag b or both c and d tags ("a" OR "b" OR ("c" AND "d")).

    model_list = Model.query_models(tags=["a", "b", "__$and", "c", "d"])
  • The following query will return models that have either tag a or tag b and both tag c and tag d (("a" OR "b") AND "c" AND "d").

    model_list = Model.query_models(
    tags=["__$and", "__$or", "a", "b", "__$and", "c", "d"]

Retrieving Models

Retrieve a local copy of a ClearML model through a Model/InputModel object's get_local_copy(). The method returns a path to a cached local copy of the model. In the case that the model is already cached, you can set force_download to True to download a fresh version.

Logging Metrics and Plots

Use the following methods to explicitly log additional information to your models. These methods can be used on Model, InputModel, and/or OutputModel objects:

SDK Reference

For information about all model methods, see the following SDK reference pages: