SPARQLConnector error when building locally

🐛 Bug

When I build this project locally (with pip install .), I get the following error message:

TypeError: unhashable type: 'SPARQLConnector'

I do not get this error message when I install this project remotely (with pip install pyRDF2Vec).

Expected Behavior

No error, regardless of whether I build locally or install from a remote release.

Current Behavior

The above shared error message.

Steps to Reproduce

1. Clone this repository.
2. Enter the directory of the resulting close and run pip install .
3. Run python main.py with the following content in file main.py:

import pandas as pd
from pyrdf2vec import RDF2VecTransformer
from pyrdf2vec.embedders import Word2Vec
from pyrdf2vec.graphs import KG
from pyrdf2vec.walkers import RandomWalker
data = pd.read_csv("https://raw.githubusercontent.com/IBCNServices/pyRDF2Vec/master/samples/countries-cities/entities.tsv", sep="\t")
entities = [entity for entity in data["location"]]
knowledge_graph = KG("https://dbpedia.org/sparql")
transformer = RDF2VecTransformer(
    Word2Vec(epochs=10),
    walkers=[RandomWalker(4, 10, with_reverse=False, n_jobs=2)])
embeddings, literals = transformer.fit_transform(knowledge_graph, entities)

1. Observe the following traceback:

Traceback (most recent call last):
  File "dbpedia.py", line 12, in <module>
    embeddings, literals = transformer.fit_transform(knowledge_graph, entities)
  File "/home/wouter/.local/lib/python3.8/site-packages/pyrdf2vec/rdf2vec.py", line 146, in fit_transform
    self.fit(kg, entities, is_update)
  File "/home/wouter/.local/lib/python3.8/site-packages/pyrdf2vec/rdf2vec.py", line 107, in fit
    walks = self.get_walks(kg, entities)
  File "/home/wouter/.local/lib/python3.8/site-packages/pyrdf2vec/rdf2vec.py", line 166, in get_walks
    if kg.skip_verify is False and not kg.is_exist(entities):
  File "/home/wouter/.local/lib/python3.8/site-packages/pyrdf2vec/graphs/kg.py", line 374, in is_exist
    responses = [self.connector.fetch(query) for query in queries]
  File "/home/wouter/.local/lib/python3.8/site-packages/pyrdf2vec/graphs/kg.py", line 374, in <listcomp>
    responses = [self.connector.fetch(query) for query in queries]
  File "/home/wouter/.local/lib/python3.8/site-packages/cachetools/__init__.py", line 686, in wrapper
    return c[k]
  File "/home/wouter/.local/lib/python3.8/site-packages/cachetools/__init__.py", line 414, in __getitem__
    link = self.__getlink(key)
  File "/home/wouter/.local/lib/python3.8/site-packages/cachetools/__init__.py", line 501, in __getlink
    value = self.__links[key]
  File "/home/wouter/.local/lib/python3.8/site-packages/cachetools/keys.py", line 19, in __hash__
    self.__hashvalue = hashvalue = hash(self)
TypeError: unhashable type: 'SPARQLConnector'

Environment

• Operating system: Ubuntu 20.04.4 LTS
• pyRDF2Vec version: 0.2.3
• Python version: 3.8.10

Additional remarks

I see the same error message in #64, but the problem description there is very different (use of a specific IDE IIUC).

[wouterbeek]

@rememberYou Running pip install . on the last commit in master indeed works for me. Thanks for fixing this!

[rememberYou]

The commit d039a702c9b072983b5f60ba7892b8d7a2cf1993 on the develop branch has fixed the issue with cachetool. If you clone to the master, since you did a git reset with an older version of cachetool, it should work too.

@wouterbeek Does it work on your side?

Using the develop branch, I’m able to extract the walk from the TriplyDB endpoint without issues. I haven’t test with the master branch.