Execution fails in colbert.index_objs() with assert classname.endswith('Vector')

[MayaBercovitch]

Hi,
Can you please explain why I'm getting this error?
I have a function using ColBERT to index some text objects and it keeps failing with this error. I'm using the CPU version.

Thanks

---

The full traceback is:
Traceback (most recent call last):
File ".pyenv/versions/3.11.5/lib/python3.11/multiprocessing/process.py", line 314, in _bootstrap
self.run()
File ".pyenv/versions/3.11.5/lib/python3.11/multiprocessing/process.py", line 108, in run
self._target(*self._args, **self._kwargs)
File ".pyenv/versions/solid3.11/lib/python3.11/site-packages/colbert/infra/launcher.py", line 134, in setup_new_process
return_val = callee(config, *args)
^^^^^^^^^^^^^^^^^^^^^
File ".pyenv/versions/solid3.11/lib/python3.11/site-packages/colbert/indexing/collection_indexer.py", line 33, in encode
encoder.run(shared_lists)
File "pyenv/versions/solid3.11/lib/python3.11/site-packages/colbert/indexing/collection_indexer.py", line 68, in run
self.train(shared_lists) # Trains centroids from selected passages
^^^^^^^^^^^^^^^^^^^^^^^^
File ".pyenv/versions/solid3.11/lib/python3.11/site-packages/colbert/indexing/collection_indexer.py", line 232, in train
centroids = self._train_kmeans(sample, shared_lists)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File ".pyenv/versions/solid3.11/lib/python3.11/site-packages/colbert/indexing/collection_indexer.py", line 304, in train_kmeans
centroids = compute_faiss_kmeans(*args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File ".pyenv/versions/solid3.11/lib/python3.11/site-packages/colbert/indexing/collection_indexer.py", line 507, in compute_faiss_kmeans
kmeans.train(sample)
File ".pyenv/versions/solid3.11/lib/python3.11/site-packages/faiss/extra_wrappers.py", line 564, in train
centroids = faiss.vector_float_to_array(clus.centroids)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File ".pyenv/versions/solid3.11/lib/python3.11/site-packages/faiss/array_conversions.py", line 118, in vector_float_to_array
return vector_to_array(v)
^^^^^^^^^^^^^^^^^^
File "pyenv/versions/solid3.11/lib/python3.11/site-packages/faiss/array_conversions.py", line 109, in vector_to_array
assert classname.endswith('Vector')
AssertionError

[Luffy241]

Yeah,I am facing the same issue while using fitz but if i change toPDFplumber for text extraction it is working.
Can you help me clarify the issue!!