问关于用PNNX将pytorch模型NCNN的问题？

以这行代码为例

/home/alpha/Desktop/pnnx-20220418-ubuntu/pnnx mymodelp4.pt inputshape=[1,8,224,224]

inputshape应该如何得到？

附上在linux下转失败的报错信息

terminate called after throwing an instance of 'c10::Error'

what(): PytorchStreamReader failed locating file constants.pkl: file not found

Exception raised from valid at ../caffe2/serialize/inline_container.cc:158 (most recent call first):

frame #0: c10::Error::Error(c10::SourceLocation, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) + 0x6b (0x7f6beec0d75b in /home/alpha/Desktop/pnnx-20220418-ubuntu/libc10.so)

frame #1: c10::detail::torchCheckFail(char const*, char const*, unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) + 0xce (0x7f6beec0938e in /home/alpha/Desktop/pnnx-20220418-ubuntu/libc10.so)

frame #2: caffe2::serialize::PyTorchStreamReader::valid(char const*, char const*) + 0x3ca (0x7f6bdb33c09a in /home/alpha/Desktop/pnnx-20220418-ubuntu/libtorch_cpu.so)

frame #3: caffe2::serialize::PyTorchStreamReader::getRecordID(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) + 0x59 (0x7f6bdb33c599 in /home/alpha/Desktop/pnnx-20220418-ubuntu/libtorch_cpu.so)

frame #4: caffe2::serialize::PyTorchStreamReader::getRecord(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) + 0x58 (0x7f6bdb33c648 in /home/alpha/Desktop/pnnx-20220418-ubuntu/libtorch_cpu.so)

frame #5: torch::jit::readArchiveAndTensors(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, c10::optional<std::function<c10::StrongTypePtr (c10::QualifiedName const&)> >, c10::optional<std::function<c10::intrusive_ptr<c10::ivalue::Object, c10::detail::intrusive_target_default_null_type<c10::ivalue::Object> > (c10::StrongTypePtr, c10::IValue)> >, c10::optional<c10::Device>, caffe2::serialize::PyTorchStreamReader&, std::shared_ptr<torch::jit::DeserializationStorageContext>) + 0x11d (0x7f6bdc93635d in /home/alpha/Desktop/pnnx-20220418-ubuntu/libtorch_cpu.so)

frame #6: <unknown function> + 0x3eeb92d (0x7f6bdc92f92d in /home/alpha/Desktop/pnnx-20220418-ubuntu/libtorch_cpu.so)

frame #7: <unknown function> + 0x3eed13d (0x7f6bdc93113d in /home/alpha/Desktop/pnnx-20220418-ubuntu/libtorch_cpu.so)

frame #8: torch::jit::load(std::shared_ptr<caffe2::serialize::ReadAdapterInterface>, c10::optional<c10::Device>, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&) + 0x1cd (0x7f6bdc93283d in /home/alpha/Desktop/pnnx-20220418-ubuntu/libtorch_cpu.so)

frame #9: torch::jit::load(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, c10::optional<c10::Device>, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&) + 0xc1 (0x7f6bdc9349d1 in /home/alpha/Desktop/pnnx-20220418-ubuntu/libtorch_cpu.so)

frame #10: torch::jit::load(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, c10::optional<c10::Device>) + 0x6f (0x7f6bdc934adf in /home/alpha/Desktop/pnnx-20220418-ubuntu/libtorch_cpu.so)

frame #11: <unknown function> + 0x337a6 (0x56281c2337a6 in /home/alpha/Desktop/pnnx-20220418-ubuntu/pnnx)

frame #12: __libc_start_main + 0xf3 (0x7f6bd848b0b3 in /lib/x86_64-linux-gnu/libc.so.6)

frame #13: <unknown function> + 0x3daea (0x56281c23daea in /home/alpha/Desktop/pnnx-20220418-ubuntu/pnnx)