error in onnx generator while generating for SVM

[kkunal1408]

While trying onnx generator I am getting this traceback error:
Traceback (most recent call last):
File "benchmarks/onnx_files/onnx_generator.py", line 306, in
create_svm(*features, args.optimize_model)
File "benchmarks/onnx_files/onnx_generator.py", line 222, in create_svm
model_proto = optimizer.optimize(model_proto, ['eliminate_identity'])
File "general/lib/python3.8/site-packages/onnx/optimizer.py", line 55, in optimize
optimized_model_str = C.optimize(model_str, passes)
IndexError: Input sub/x:0 is undefined!

I have provided the optimization flag as false "-o False"