Alex Berndt
03/06/2024, 6:12 PMScout
03/06/2024, 6:12 PMDynamicPartitionsDefinition
to define dynamic partitions for your images. This allows you to add new partitions dynamically, which is useful when the set of partitions (images in your case) is not known ahead of time.
2. Create ML Model Assets: Define assets for each of your ML models. These assets will represent the application of the ML models to the images.
3. Apply ML Models to Images: Create an asset that takes an image (partition) as input and applies all relevant ML models to that image. The asset's computation can dynamically determine which ML models to apply based on the image or other criteria.
4. Evaluate ML Models: After applying the ML models, you can have another asset or set of assets that evaluate the performance of the models on each image. This can involve calculating metrics like accuracy, precision, recall, etc., and storing these as metadata for analysis.
5. Materialize Results: Use define_asset_job
to define a job that materializes the assets. If you want to automatically materialize new partitions as they are added, you can use AutoMaterializePolicy.eager()
.
6. Enhance the UI with Metadata: Utilize metadata to track the evaluation metrics of your ML models. This metadata can be visualized in the Dagster UI, allowing you to monitor the performance of each model on each image over time.
Here's a simplified example of how you might define the assets:
```python
from dagster import DynamicPartitionsDefinition, asset, define_asset_job, AutoMaterializePolicy
# Define dynamic partitions for images
image_partition = DynamicPartitionsDefinition(name="image_partition")
# Define an asset that applies ML models to an image
@asset(partitions_def=image_partition, auto_materialize_policy=AutoMaterializePolicy.eager())
def apply_ml_models(context):
image = load_image(context.partition_key)
model_results = {}
for model in get_relevant_models(image):
model_results[model.name] = model.apply(image)
return model_results
# Define an asset that evaluates the ML models
@asset(partitions_def=image_partition)
def evaluate_ml_models(apply_ml_models):
evaluation_results = {}
for model_name, model_output in apply_ml_models.items():
evaluation_results[model_name] = evaluate_model(model_output)
return evaluation_results
# Define a job to materialize the assets
ml_evaluation_job = define_asset_job("ml_evaluation_job", selection=[apply_ml_models, evaScout
03/06/2024, 6:13 PMload_image
, get_relevant_models
, and evaluate_model
according to your specific requirements. Additionally, you would need to handle the dynamic addition of partitions (images) and the association of ML models with those partitions. Remember to consult the Dagster documentation for detailed information on each of these steps and the specific APIs you will need to use.Alex Berndt
03/06/2024, 6:15 PMScout
03/06/2024, 6:15 PMmulti_asset
to dynamically generate assets based on the number of ML models that need to be applied to each image. The multi_asset
decorator allows you to yield multiple assets from a single computation.
2. Image Partitioning: Define a partition for each image, as each image will be processed independently.
3. ML Model Application: Inside the multi_asset
, load the image corresponding to the current partition, determine the relevant ML models to apply, and then apply each model to the image.
4. Evaluation and Metadata: After applying each model, evaluate its performance and capture the evaluation metrics as metadata. This metadata can be used to enhance the Dagster UI with relevant information about the model's performance on the image.
5. Materialization: Define a job that materializes the dynamically generated assets. You can use AutoMaterializePolicy
to automatically materialize new assets as they are created.
Here's a conceptual example of how you might define the dynamic asset:
python
from dagster import DynamicPartitionsDefinition, multi_asset, AssetOut, AssetMaterialization, MetadataValue
# Define dynamic partitions for images
image_partition = DynamicPartitionsDefinition(name="image_partition")
@multi_asset(
outs=lambda _: {"model_output": AssetOut(metadata={"model_name": "dynamic"})},
partitions_def=image_partition
)
def apply_and_evaluate_models(context):
image = load_image(context.partition_key)
relevant_models = determine_models_for_image(image)
for model in relevant_models:
model_output = model.apply(image)
evaluation_metrics = evaluate_model(model_output)
# Yield an asset materialization with metadata for each model
yield AssetMaterialization(
asset_key=f"model_output_{model.name}",
metadata={
"evaluation_metrics": MetadataValue.json(evaluation_metrics),
"model_name": model.name
}
)
# Yield the model output as an asset
yield "model_output", model_output
# Define a job to materialize the assets
ml_evaluation_job = define_asset_job("ml_evaluation_job", selection=[apply_and_evaluate_models])
In this example, load_image
is a function that loads the image for the given partition key, determine_models_for_image
dynamically determines which models to apply to the image, and `evaluate_moScout
03/06/2024, 6:16 PMdetermine_models_for_image
) and that you have a mechanism to evaluate the models (evaluate_model
). The actual implementation details will depend on your specific use case and requirements. Remember to consult the Dagster documentation for detailed information on dynamic orchestration and how to implement these concepts in your Dagster pipelines.