relational-datasets 0.4.0

A small library for loading and downloading relational datasets

relational-datasets

A small library for loading and downloading relational datasets.

pip install relational-datasets

Beta Release

This API and the datasets at https://github.com/srlearn/datasets/ are currently being experimented with.

• Prefer Julia? Check out RelationalDatasets.jl.

Open enhancements and bugs are tracked here:

• Issues: relational-datasets package
• Issues: datasets

But here is a short-term Roadmap:

• Modes: srlearn/datasets: Issue 11
• Converting propositional->relational
  • Problem Settings
    • Binary Classification
      • Classification: (0, 1)
      • Classification: (-1, 1)
      • Classification: maybe recommend sklearn.preprocessing.LabelBinarizer
    • Regression
      • Regression: y ∈ float
    • Multiclass Classification: When target is int and in [0, 1, 2, ...]
  • Categorical datatype support in X matrix.
  • Dataframes: pandas

Use Case 1: Fetching Zipfiles

Running the fetch method downloads a version of a datset to your local cache:

import relational_datasets

relational_datasets.fetch("toy_cancer")
relational_datasets.fetch("toy_father", "v0.0.3")
relational_datasets.fetch("cora")

Resulting in:

~/relational_datasets/
├── toy_cancer_v0.0.4.zip   <--- latest
├── toy_father_v0.0.3.zip   <--- specific version
└── cora_v0.0.4.zip         <--- latest

Use Case 2: Loading Data

The load method returns train and test folds—each with pos, neg, and facts. Internally it uses fetch, so it will automatically download a dataset if it is not available.

For example: "Load fold-2 of webkb"

from relational_datasets import load

train, test = load("webkb", "v0.0.4", fold=2)

len(train.facts)
# 1344

Use Case 3: Working with Standard (Vector-based) Machine Learning Datasets

The relational_datasets.convert module has functions for converting vector-based datasets into relational/ILP-style datasets:

Binary Classification

When y is a vector of 0/1

from relational_datasets.convert import from_numpy
import numpy as np

data, modes = from_numpy(
  np.array([[0, 1, 1], [0, 1, 2], [1, 2, 2]]),
  np.array([0, 0, 1]),
)

data, modes

(RelationalDataset(pos=['v4(id3).'], neg=['v4(id1).', 'v4(id2).'], facts=['v1(id1,0).', 'v1(id2,0).', 'v1(id3,1).', 'v2(id1,1).', 'v2(id2,1).', 'v2(id3,2).', 'v3(id1,1).', 'v3(id2,2).', 'v3(id3,2).']),
['v1(+id,#varv1).', 'v2(+id,#varv2).', 'v3(+id,#varv3).', 'v4(+id).'])

Regression

When y is a vector of floats

from relational_datasets.convert import from_numpy
import numpy as np

data, modes = from_numpy(
  np.array([[0, 1, 1], [0, 1, 2], [1, 2, 2]]),
  np.array([1.1, 0.9, 2.5]),
)

data, modes

(RelationalDataset(pos=['regressionExample(v4(id1),1.1).', 'regressionExample(v4(id2),0.9).', 'regressionExample(v4(id3),2.5).'], neg=[], facts=['v1(id1,0).', 'v1(id2,0).', 'v1(id3,1).', 'v2(id1,1).', 'v2(id2,1).', 'v2(id3,2).', 'v3(id1,1).', 'v3(id2,2).', 'v3(id3,2).']),
['v1(+id,#varv1).', 'v2(+id,#varv2).', 'v3(+id,#varv3).', 'v4(+id).'])

Preprocessing scikit-learn's load_breast_cancer

load_breast_cancer is based on the Breast Cancer Wisconsin dataset.

Here we: (1) load the data and class labels, (2) split into training and test sets, (3) bin the continuous features to discrete, and (4) convert to the relational format.

from sklearn.datasets import load_breast_cancer
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import KBinsDiscretizer

# (1) Load
X, y = load_breast_cancer(return_X_y=True)

# (2) Split
X_train, X_test, y_train, y_test = train_test_split(X, y)

# (3) Discretize
disc = KBinsDiscretizer(n_bins=5, encode="ordinal")
X_train = disc.fit_transform(X_train)
X_test = disc.transform(X_test)
X_train = X_train.astype(int)
X_test = X_test.astype(int)

# (4) Convert
from relational_datasets.convert import from_numpy

train, modes = from_numpy(X_train, y_train)
test, _ = from_numpy(X_test, y_test)

Install

From PyPi

pip install relational-datasets

From GitHub Source

git clone https://github.com/srlearn/relational-datasets.git
cd relational-datasets
pip install -e .

Contributions

• Alexander Hayes - Indiana University, Bloomington

This package was partially based on datasets from the Starling Lab Datasets Collection, which included specific contributions by Harsha Kokel and Devendra Singh Dhami. Tushar Khot converted many to the ILP format from Alchemy 2 format, but that occurred before versions were tracked. Some inspiration was drawn from the "RelationalDatasets" list that Jonas Schouterden collected.