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Natural Entity Types

This repository contains code to select the most natural type for Wikidata entities. For each entity, we consider the types connected to this entity in Wikidata via an instance-of/subclass-of* path. That is, we create a set of candidate types that consists of all types that are reachable from the entity via a chain of relations that starts with a single instance-of relation, followed by an arbitrary number of subclass-of relations (which may be 0). We employ various methods such as a Gradient Boost Regressor model and a feed forward neural network to score each candidate type and select the most natural one.

Setup

Install the requirements (in a virtual environment) by running the following command:

pip3 install -r requirements.txt

Run

python3 -m spacy download en_core_web_lg

Finally, generate the necessary data files by running the following command:

make generate_all

This will download Wikidata mappings using the QLever API, generate databases from them for quick access, and compute type properties from these Wikidata mappings which are used as features by the models. This can take a couple of hours.

OR download the precomputed mappings by running (faster, but the mappings will not be as up-to-date):

make download_all

Evaluation

To train and/or evaluate a model, adjust the following command according to your needs:

python3 scripts/evaluate.py -m <gbr|nn|gpt|oracle> --save_model <model_file> -b <benchmark_file> -train <training_file>
  • The -m option specifies the model to be evaluated. You can choose from gbr (Gradient Boost Regressor), nn (Feed Forward Neural Network), gpt (GPT-4), and oracle. oracle is a model that always predicts the ground truth type of the benchmark entity if it is among the candidate types. The oracle evaluation results represent the upper bound of what a model that relies on the candidate types can achieve.
  • <model_file> is the path where the trained model will be saved (optional).
  • <benchmark_file> is the path to the benchmark file on which the model will be evaluated, e.g. benchmarks/mini_benchmark.test.tsv. The expected format of the benchmark is a tsv file with one line per entity, with the entity QID in the first column and the space-separated QIDs of the ground truth types in the second column.
  • <training_file> is the path to the file that contains the training data. The expected format is the same as for the benchmark file.

Once you have evaluated a model for the first time (assuming you used the --save_model option), you can replace the --save_model option with the --load_model option to load the previously saved model from the specified file without having to train it again.