Specialized Action Classes

Synapse SDK provides specialized base classes for common ML workflows. Each extends BaseAction with workflow-specific helper methods and default settings.

Available Specialized Actions

Quick Comparison

# Training - autolog, get_dataset, create_model
class TrainAction(BaseTrainAction[TrainParams]):
    def execute(self) -> dict:
        self.autolog('ultralytics')  # Auto-log metrics
        dataset = self.get_dataset()
        # ... train ...
        return self.create_model('./model.pt')

# Export - get_filtered_results
class ExportAction(BaseExportAction[ExportParams]):
    def get_filtered_results(self, filters: dict) -> tuple[Any, int]:
        return self.client.get_assignments(filters)

# Upload - step-based workflow required
class UploadAction(BaseUploadAction[UploadParams]):
    def setup_steps(self, registry: StepRegistry[UploadContext]) -> None:
        registry.register(InitStep())
        registry.register(UploadFilesStep())

# Inference - download_model, load_model, infer
class InferAction(BaseInferenceAction[InferParams]):
    def execute(self) -> dict:
        model = self.load_model(self.params.model_id)
        return {'predictions': self.infer(model, self.params.inputs)}

# Pre-annotation - convert_data_from_file, convert_data_from_inference
class PreAnnotateAction(AddTaskDataAction):
    def convert_data_from_file(self, primary_url, ...) -> dict:
        return {'annotations': [...]}

Execution Modes

All specialized actions (except Deployment) support two modes:

1. Simple Execute: Override execute() for straightforward workflows
2. Step-based: Override setup_steps() for complex multi-step workflows with rollback

# Simple mode
class SimpleTrainAction(BaseTrainAction[Params]):
    def execute(self) -> dict:
        return {'weights_path': '/model.pt'}

# Step-based mode
class StepTrainAction(BaseTrainAction[Params]):
    def setup_steps(self, registry: StepRegistry[TrainContext]) -> None:
        registry.register(LoadDatasetStep())
        registry.register(TrainStep())
        registry.register(UploadModelStep())

Detailed References

• references/train-action.md - Training workflows with autolog, checkpoints
• references/export-action.md - Data export workflows
• references/upload-action.md - File upload with step workflow
• references/inference-action.md - Model inference and deployment
• references/add-task-data-action.md - Pre-annotation workflows
• references/progress-categories.md - Progress category constants