FraudAmazonDatasetΒΆ

class dgl.data.FraudAmazonDataset(raw_dir=None, random_seed=717, train_size=0.7, val_size=0.1, force_reload=False, verbose=True, transform=None)[source]ΒΆ

Bases: dgl.data.fraud.FraudDataset

Fraud Amazon Dataset

The Amazon dataset includes product reviews under the Musical Instruments category. Users with more than 80% helpful votes are labelled as benign entities and users with less than 20% helpful votes are labelled as fraudulent entities. A fraudulent user detection task can be conducted on the Amazon dataset, which is a binary classification task. 25 handcrafted features from <https://arxiv.org/pdf/2005.10150.pdf> are taken as the raw node features .

Users are nodes in the graph, and three relations are: 1. U-P-U : it connects users reviewing at least one same product 2. U-S-U : it connects users having at least one same star rating within one week 3. U-V-U : it connects users with top 5% mutual review text similarities (measured by TF-IDF) among all users.

Statistics:

  • Nodes: 11,944

  • Edges:

    • U-P-U: 351,216

    • U-S-U: 7,132,958

    • U-V-U: 2,073,474

  • Classes:

    • Positive (fraudulent): 821

    • Negative (benign): 7,818

    • Unlabeled: 3,305

  • Positive-Negative ratio: 1 : 10.5

  • Node feature size: 25

Parameters

  • raw_dir (str) – Specifying the directory that will store the downloaded data or the directory that already stores the input data. Default: ~/.dgl/

  • random_seed (int) – Specifying the random seed in splitting the dataset. Default: 717

  • train_size (float) – training set size of the dataset. Default: 0.7

  • val_size (float) – validation set size of the dataset, and the size of testing set is (1 - train_size - val_size) Default: 0.1

  • force_reload (bool) – Whether to reload the dataset. Default: False

  • verbose (bool) – Whether to print out progress information. Default: True.

  • transform (callable, optional) – A transform that takes in a DGLGraph object and returns a transformed version. The DGLGraph object will be transformed before every access.

Examples

>>> dataset = FraudAmazonDataset()
>>> graph = dataset[0]
>>> num_classes = dataset.num_classes
>>> feat = graph.ndata['feature']
>>> label = graph.ndata['label']
__getitem__(idx)ΒΆ

Get graph object

Parameters

idx (int) – Item index

Returns

graph structure, node features, node labels and masks

  • ndata['feature']: node features

  • ndata['label']: node labels

  • ndata['train_mask']: mask of training set

  • ndata['val_mask']: mask of validation set

  • ndata['test_mask']: mask of testing set

Return type

dgl.DGLGraph

__len__()ΒΆ

number of data examples