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task.py

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+from .operator import StreamInstanceOperator
+
+from typing import Dict, List, Any
+
+
+class Tasker:
+    pass
+
+
+class FormTask(Tasker, StreamInstanceOperator):
+    inputs: List[str]
+    outputs: List[str]
+    metrics: List[str]
+
+    def process(self, instance: Dict[str, Any], stream_name: str = None) -> Dict[str, Any]:
+        inputs = {key: instance[key] for key in self.inputs}
+        outputs = {key: instance[key] for key in self.outputs}
+        return {
+            "inputs": inputs,
+            "outputs": outputs,
+            "metrics": self.metrics,
+        }