Step

A step is the smallest unit of a workflow. In a DAG, a step is also a phase. Different types of steps have different service abilities. The main parts of a step are as follows.

**Table 1** Step
Parameter	Description	Mandatory	Data Type
name	Phase name. The name can contain a maximum of 64 characters, including only letters, digits, underscores (_), and hyphens (-), and must start with a letter.	Yes	str
title	Title of a phase, which is displayed in the DAG. If this parameter is not configured, the name is displayed by default.	No	str
step_type	Type of a phase, which determines the function of the phase	Yes	enum
inputs	Inputs of a phase	No	AbstractInput or list[AbstractInput]
outputs	Outputs of a phase	No	AbstractOutput or list[AbstractOutput]
properties	Node properties	No	dict
policy	Phase execution policy, which includes the phase scheduling interval, the phase execution timeout interval, and the option to skip phase execution	No	StepPolicy
depend_steps	List of dependency phases. This parameter determines the DAG structure and phase execution sequence.	No	Step or list[Step]

**Table 2** StepPolicy
Parameter	Description	Mandatory	Data Type
poll_interval_seconds	Phase scheduling interval. The default value is 1 second.	Yes	str
max_execution_minutes	Phase execution timeout interval. The default value is 10080 minutes, that is, 7 days.	Yes	str
skip_conditions	Conditions that determine whether a phase is skipped	No	Condition or condition list

Step is a superclass of a phase. It has a conceptual role and is not used directly by you. Different types of phase are created based on functions, including CreateDatasetStep, LabelingStep, DatasetImportStep, ReleaseDatasetStep, JobStep, ModelStep, ServiceStep and ConditionStep. For details, see Phase Type.