FeatureNode

A single authored operator node in a concept's feature DAG.

This is the authored representation — it mirrors the YAML format used in concept definitions. The inputs dict maps each operator input slot name to either a primitive name (e.g. 'user.activity_count') or another feature name in this concept (e.g. 'activity_drop').

The compiler resolves symbolic names to upstream node_ids when producing GraphNode. output_type is NOT set by the author — it is inferred by the type checker during compilation.

params carries operator-specific parameters (e.g. {'window': '30d'} for pct_change or moving_average). Duration values must follow the format: positive integer + suffix (h/d/w/m/y). E.g. '30d', '4w'.

opOp (string)required

inputsobjectrequired

paramsobject

FeatureNode

{
  "op": "string",
  "inputs": {},
  "params": {}
}