Fix constant folding methods

onnxscript/optimizer/_constant_folding.py

@@ -362,7 +362,7 @@ def concat_from_sequence(node: ir.Node, op, state: OptimizerState) -> ReturnValu
             unsqueezed_inputs = []
             for node_input in inputs:
                 unsqueezed_input = op.Unsqueeze(
-                    node_input, axis_value, outputs=[f"{node_input.name}_unsqueeze"]
+                    node_input, axis_value, _outputs=[f"{node_input.name}_unsqueeze"]
                 )
                 unsqueezed_inputs.append(unsqueezed_input)
             # Send unsqueezed outputs to Concat
@@ -427,13 +427,13 @@ def split_to_sequence(node: ir.Node, op, state: OptimizerState) -> ReturnValue:
         num_outputs = math.ceil(split_dimension_size / split_value.item())
         split_outputs = [f"{output.name}_split_{i}" for i in range(num_outputs)]
         split_values = op.Split(
-            input, axis=axis, num_outputs=num_outputs, outputs=split_outputs
+            input, axis=axis, num_outputs=num_outputs, _outputs=split_outputs
         )
     elif split_value.ndim == 1:
         # split into 'size(split)' chunks
         num_outputs = split_value.size
         split_outputs = [f"{output.name}_split_{i}" for i in range(num_outputs)]
-        split_values = op.Split(input, split, axis=axis, outputs=split_outputs)
+        split_values = op.Split(input, split, axis=axis, _outputs=split_outputs)
     else:
         return None
 
@@ -442,11 +442,11 @@ def split_to_sequence(node: ir.Node, op, state: OptimizerState) -> ReturnValue:
         return None
     if keepdims == 0:
         # squeeze the split dimension if keepdims is 0
-        axis_val = op.Constant(value_int=axis, outputs=[f"{output.name}_axis"])
+        axis_val = op.Constant(value_int=axis, _outputs=[f"{output.name}_axis"])
         squeezed_values = []
         for i in range(num_outputs):
             squeezed = op.Squeeze(
-                split_values[i], axis_val, outputs=[f"{split_outputs[i]}_squeeze"]
+                split_values[i], axis_val, _outputs=[f"{split_outputs[i]}_squeeze"]
             )
             squeezed_values.append(squeezed)
         split_values = squeezed_values