ONNX: Function definition in nested calls are not displayed

[justinchuby]

• Netron app and version: 7.4.2

Steps to Reproduce:

1. Click into torch_nn_modules_container_Sequential_class_layers_1-> torch_nn_modules_pooling_AdaptiveAvgPool2d_class_layers_pool_1-> aten_mean_dim.
2. Observe that the model local function IsScalar does not have a definition associated with it
   
3. The function is defined in a different domain:

import onnx
m = onnx.load("Clara_DenseNet_dynamo.onnx")
print(m.functions[-1])

yields

name: "IsScalar"
input: "input"
output: "return_val"
node {
  input: "input"
  output: "tmp"
  name: "n0"
  op_type: "Shape"
  domain: ""
}
node {
  input: "tmp"
  output: "tmp_0"
  name: "n1"
  op_type: "Size"
  domain: ""
}
node {
  output: "tmp_1"
  name: "n2"
  op_type: "Constant"
  attribute {
    name: "value_int"
    i: 0
    type: INT
  }
  domain: ""
}
node {
  input: "tmp_0"
  input: "tmp_1"
  output: "return_val"
  name: "n3"
  op_type: "Equal"
  domain: ""
}
doc_string: "Return whether the input has rank 0, or is a scalar."
opset_import {
  domain: ""
  version: 18
}
domain: "pkg.onnxscript.torch_lib.common"

Please attach or link model files to reproduce the issue.

Clara_DenseNet_dynamo.zip

Discovered from microsoft/onnxscript#1263