AttributeError: 'NoneType' object has no attribute 'split'

[marquicus]

Describe the bug
Throwing AttributeError: 'NoneType' object has no attribute 'split' when trying to mk_truss

To Reproduce
Directly taken from "Quickstart: making a truss"

...
rfc.fit(data_x, data_y)

# Create the Truss (serializing & packaging model)
tr = truss.mk_truss(rfc, target_directory="iris_rfc_truss")  # this line fails
... 

Expected behavior
Expected to see working sample

Screenshots/Logs

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In[149], line 15
     12 rfc.fit(data_x, data_y)
     14 # Create the Truss (serializing & packaging model)
---> 15 tr = truss.mk_truss(rfc, target_directory="iris_rfc_truss")
     17 # Serve a prediction from the model
     18 # tr.server_predict({"inputs": [[0, 0, 0, 0]]})

File ~/.virtualenvs/datasciense/lib/python3.8/site-packages/truss/build.py:267, in mk_truss(model, target_directory, data_files, requirements_file, bundled_packages)
    257 def mk_truss(
    258     model: Any,
    259     target_directory: str = None,
   (...)
    264     # Some model objects can are callable (like Keras models)
    265     # so we first attempt to make Truss via a model object
--> 267     model_scaffold = mk_truss_from_model_with_exception_handler(
    268         model, target_directory, data_files, requirements_file, bundled_packages
    269     )
    270     if model_scaffold:
    271         return model_scaffold

File ~/.virtualenvs/datasciense/lib/python3.8/site-packages/truss/build.py:203, in mk_truss_from_model_with_exception_handler(*args)
    200 def mk_truss_from_model_with_exception_handler(*args):
    201     # returns None if framework not supported, otherwise the Truss
    202     try:
--> 203         return mk_truss_from_model(*args)
    204     except FrameworkNotSupportedError:
    205         return None

File ~/.virtualenvs/datasciense/lib/python3.8/site-packages/truss/build.py:99, in mk_truss_from_model(model, target_directory, data_files, requirements_file, bundled_packages)
     97 else:
     98     target_directory_path = Path(target_directory)
---> 99 model_framework.to_truss(model, target_directory_path)
    100 scaf = TrussHandle(target_directory_path)
    101 _update_truss_props(scaf, data_files, requirements_file, bundled_packages)

File ~/.virtualenvs/datasciense/lib/python3.8/site-packages/truss/model_framework.py:69, in ModelFramework.to_truss(self, model, target_directory)
     61 python_version = map_to_supported_python_version(infer_python_version())
     63 # Create config
     64 config = TrussConfig(
     65     model_name=self.model_name(model),
     66     model_type=self.model_type(model),
     67     model_framework=self.typ(),
     68     model_metadata=self.model_metadata(model),
---> 69     requirements=self.requirements_txt(),
     70     python_version=python_version,
     71 )
     72 with (target_directory / CONFIG_FILE).open("w") as config_file:
     73     yaml.dump(config.to_dict(), config_file)

File ~/.virtualenvs/datasciense/lib/python3.8/site-packages/truss/model_framework.py:29, in ModelFramework.requirements_txt(self)
     27 def requirements_txt(self) -> List[str]:
---> 29     return list(infer_deps(must_include_deps=self.required_python_depedencies()))

File ~/.virtualenvs/datasciense/lib/python3.8/site-packages/truss/environment_inference/requirements_inference.py:44, in infer_deps(must_include_deps)
     41 if not must_include_deps:
     42     must_include_deps = set()
---> 44 pkg_candidates = _extract_packages_from_frame(relevant_stack[0].frame)
     45 imports = must_include_deps.union(pkg_candidates)
     46 requirements = set([])

File ~/.virtualenvs/datasciense/lib/python3.8/site-packages/truss/environment_inference/requirements_inference.py:98, in _extract_packages_from_frame(frame)
     96     pkg_name = val.__name__.split(".")[0]
     97 elif hasattr(val, "__module__"):
---> 98     pkg_name = val.__module__.split(".")[0]
     99 else:
    100     continue

AttributeError: 'NoneType' object has no attribute 'split'

Desktop (please complete the following information):

• OS: Linux 5+
• Environment versions: python 3.8.12, sklearn 1.1.3 with poetry 1.3.1
• Truss version: 0.1.12

Additional context
Nothing

[pankajroark]

@marquicus Thanks a lot for reporting the issue, I've attempted a fix in the attached PR. We'll land this asap after review and create a release for you to see if that fixes the issue in question.