fusion of grouped ConvTranspose and BatchNormalization results in exception

[bas-aarts]

Converting the attached ONNX model with the following script:

from onnxscript import ir
from onnxscript.optimizer import optimize

ir_model = ir.load("input.onnx")
optimized_model = optimize(ir_model)
ir.save(optimized_model, "output.onnx")

results in an exception:
ValueError: operands could not be broadcast together with shapes (16,8,1,5) (1,16,1,1)

input.onnx.zip

versions of relevant packages:

ml_dtypes         0.5.4
onnx              1.20.1
onnx-ir           0.2.0
onnxscript        0.6.2