onnx_graphsurgeon: toposort failed on a graph without cycle

[xhdhr10000]

Description

Run toposort on this simple onnx got an error:
OnnxGraphSurgeonException: Cycle detected in graph! Are there tensors with duplicate names in the graph?

Environment

onnx==1.16.2
onnx_graphsurgeon==0.5.2

Operating System:
Ubuntu 20.04

Python Version (if applicable):
python==3.8.10

Relevant Files

Model link:
toposort.onnx.zip

Steps To Reproduce

Commands or scripts:

import onnx
import onnx_graphsurgeon as gs

graph = gs.import_onnx(onnx.load('./toposort.onnx'))
graph.toposort()
# `OnnxGraphSurgeonException: Cycle detected in graph! Are there tensors with duplicate names in the graph?`

Have you tried the latest release?:
Yes

Can this model run on other frameworks? For example run ONNX model with ONNXRuntime (polygraphy run <model.onnx> --onnxrt):
Yes

import onnx
import onnxruntime as ort

model = onnx.load('./toposort.onnx')
sess = ort.InferenceSession(model.SerializeToString())
sess.run(['mul_0_output'], {'input': np.array(3., dtype=np.float32)})
# Out: [array(-9., dtype=float32)]

[lix19937]

I use trtexec, polygraphy, onnx-graphsurgeon, all are passed. You can follow my onnx-graphsurgeon version

onnx                      1.15.0
onnx-graphsurgeon         0.3.21
onnx-simplifier           0.4.36
onnxruntime               1.17.1

[srasmussenvl]

I ran in to this issue as well.
The fix proposed in #4087 worked.

Thanks!