Removing initializer ‘xxx‘. It is not used by any node and should be removed from the model.问题解决

解决办法：

import onnx
import onnxoptimizer

onnx_model = onnx.load(onnxfile)
passes = ["extract_constant_to_initializer", "eliminate_unused_initializer"]
optimized_model = onnxoptimizer.optimize(onnx_model, passes)

onnx.save(optimized_model, onnxfile)