此模型当前仅有onnx，无法使用pnnx进行转换。
onnx --> simpleonnx --> onnx2ncnn[x] --> ncnnOptimize --> ncnn
在onnx2ncnn步骤失败，报错如下:
# step1:
python -m onnxsim animeganv3_H64_model0.onnx sim.onnx --dynamic-input-shape
# step2:
onnx2ncnn.exe sim.onnx ncnn.param ncnn.bin
报错内容：
Shape not supported yet!
Gather not supported yet!
Cast not supported yet!
# to=6
Cast not supported yet!
# to=7
Unknown data type 0
Shape not supported yet!
Gather not supported yet!
Cast not supported yet!
# to=6
Unsupported squeeze axes !
Unsupported unsqueeze axes !
Unsupported squeeze axes !
解决办法： 手工优化 https://zhuanlan.zhihu.com/p/93017149
待测试