Remove input tests

libs/labelbox/src/labelbox/schema/workflow/workflow_utils.py

@@ -117,31 +117,6 @@ def validate_node_connections(
                             "node_type": node_type,
                         }
                     )
-                elif len(predecessors) > 1:
-                    # Check if all predecessors are initial nodes
-                    node_map = {n.id: n for n in nodes}
-                    predecessor_nodes = [
-                        node_map.get(pred_id) for pred_id in predecessors
-                    ]
-                    all_initial = all(
-                        pred_node
-                        and pred_node.definition_id in initial_node_types
-                        for pred_node in predecessor_nodes
-                        if pred_node is not None
-                    )
-
-                    if not all_initial:
-                        preds_info = ", ".join(
-                            [p[:8] + "..." for p in predecessors]
-                        )
-                        errors.append(
-                            {
-                                "reason": f"has multiple incoming connections ({len(predecessors)}) but not all are from initial nodes",
-                                "node_id": node.id,
-                                "node_type": node_type,
-                                "details": f"Connected from: {preds_info}",
-                            }
-                        )
 
             # Check outgoing connections (except terminal nodes)
             if node.definition_id not in terminal_node_types:

libs/labelbox/tests/integration/test_workflow.py

@@ -96,6 +96,40 @@ def test_workflow_creation(client, test_projects):
     assert WorkflowDefinitionId.Done in node_types
 
 
+def test_workflow_allows_multiple_incoming_from_non_initial_nodes(
+    client, test_projects
+):
+    """
+    Nodes may have multiple incoming connections from any nodes (not only initial nodes).
+
+    This used to fail validation when a node had >1 predecessor and at least one
+    predecessor was not an initial node.
+    """
+    source_project, _ = test_projects
+
+    workflow = source_project.get_workflow()
+    initial_nodes = workflow.reset_to_initial_nodes(
+        labeling_config=LabelingConfig(instructions="Start labeling here")
+    )
+
+    logic = workflow.add_node(
+        type=NodeType.Logic,
+        name="Gate",
+        filters=ProjectWorkflowFilter([labeled_by.is_one_of(["test-user"])]),
+    )
+    review = workflow.add_node(type=NodeType.Review, name="Review Task")
+    done = workflow.add_node(type=NodeType.Done, name="Done")
+
+    # Multiple incoming connections to review, including from a non-initial node (logic)
+    workflow.add_edge(initial_nodes.labeling, logic)
+    workflow.add_edge(logic, review, NodeOutput.If)
+    workflow.add_edge(initial_nodes.rework, review)
+    workflow.add_edge(review, done, NodeOutput.Approved)
+
+    # Should validate and update successfully
+    workflow.update_config(reposition=False)
+
+
 def test_workflow_creation_simple(client):
     """Test creating a simple workflow with the working pattern."""
     # Create a new project for this test

libs/labelbox/tests/unit/test_workflow_utils_validation.py

@@ -0,0 +1,64 @@
+from dataclasses import dataclass
+
+from labelbox.schema.workflow.enums import WorkflowDefinitionId
+from labelbox.schema.workflow.graph import ProjectWorkflowGraph
+from labelbox.schema.workflow.workflow_utils import WorkflowValidator
+
+
+@dataclass(frozen=True)
+class _Node:
+    id: str
+    definition_id: WorkflowDefinitionId
+
+
+def test_validate_node_connections_allows_multiple_incoming_from_non_initial_nodes():
+    """
+    Regression test: nodes may have multiple incoming connections from any nodes.
+
+    Historically validation required that if a node had >1 predecessors, they all had
+    to be initial nodes. Workflow Management now allows multi-input nodes from any
+    nodes, so this must not error.
+    """
+    initial_labeling = _Node(
+        id="initial_labeling",
+        definition_id=WorkflowDefinitionId.InitialLabelingTask,
+    )
+    initial_rework = _Node(
+        id="initial_rework",
+        definition_id=WorkflowDefinitionId.InitialReworkTask,
+    )
+    logic = _Node(id="logic", definition_id=WorkflowDefinitionId.Logic)
+    review = _Node(id="review", definition_id=WorkflowDefinitionId.ReviewTask)
+    done = _Node(id="done", definition_id=WorkflowDefinitionId.Done)
+
+    nodes = [initial_labeling, initial_rework, logic, review, done]
+
+    graph = ProjectWorkflowGraph()
+    graph.add_edge(initial_labeling.id, logic.id)
+    graph.add_edge(logic.id, review.id)
+    graph.add_edge(initial_rework.id, review.id)
+    graph.add_edge(review.id, done.id)
+
+    errors = WorkflowValidator.validate_node_connections(nodes, graph)
+    assert errors == []
+
+
+def test_validate_node_connections_still_flags_missing_incoming_connections():
+    """Non-initial nodes must still have at least one incoming connection."""
+    initial_labeling = _Node(
+        id="initial_labeling",
+        definition_id=WorkflowDefinitionId.InitialLabelingTask,
+    )
+    review = _Node(id="review", definition_id=WorkflowDefinitionId.ReviewTask)
+    done = _Node(id="done", definition_id=WorkflowDefinitionId.Done)
+
+    nodes = [initial_labeling, review, done]
+    graph = ProjectWorkflowGraph()
+    graph.add_edge(initial_labeling.id, done.id)
+
+    errors = WorkflowValidator.validate_node_connections(nodes, graph)
+    assert any(
+        e.get("node_id") == review.id
+        and e.get("reason") == "has no incoming connections"
+        for e in errors
+    )