DGCNN

class torcheeg.models.DGCNN(in_channels: int = 5, num_electrodes: int = 62, num_layers: int = 2, hid_channels: int = 32, num_classes: int = 2)

Dynamical Graph Convolutional Neural Networks (DGCNN). For more details, please refer to the following information.

• Paper: Song T, Zheng W, Song P, et al. EEG emotion recognition using dynamical graph convolutional neural networks[J]. IEEE Transactions on Affective Computing, 2018, 11(3): 532-541.

• URL: https://ieeexplore.ieee.org/abstract/document/8320798

• Related Project: https://github.com/xueyunlong12589/DGCNN

Below is a recommended suite for use in emotion recognition tasks:

from torcheeg.models import DGCNN
from torcheeg.datasets import SEEDDataset
from torcheeg import transforms

dataset = SEEDDataset(root_path='./Preprocessed_EEG',
                      offline_transform=transforms.BandDifferentialEntropy(band_dict={
                          "delta": [1, 4],
                          "theta": [4, 8],
                          "alpha": [8, 14],
                          "beta": [14, 31],
                          "gamma": [31, 49]
                      }),
                      online_transform=transforms.Compose([
                          transforms.ToTensor()
                      ]),
                      label_transform=transforms.Compose([
                          transforms.Select('emotion'),
                          transforms.Lambda(lambda x: x + 1)
                      ]))

model = DGCNN(in_channels=5, num_electrodes=62, hid_channels=32, num_layers=2, num_classes=2)

x, y = next(iter(DataLoader(dataset, batch_size=64)))
model(x)

Parameters:

• in_channels (int) – The feature dimension of each electrode. (default: 5)

• num_electrodes (int) – The number of electrodes. (default: 62)

• num_layers (int) – The number of graph convolutional layers. (default: 2)

• hid_channels (int) – The number of hidden nodes in the first fully connected layer. (default: 32)

• num_classes (int) – The number of classes to predict. (default: 2)

forward(x: Tensor) → Tensor

Parameters:

x (torch.Tensor) – EEG signal representation, the ideal input shape is [n, 62, 5]. Here, n corresponds to the batch size, 62 corresponds to num_electrodes, and 5 corresponds to in_channels.

Returns:

the predicted probability that the samples belong to the classes.

Return type:

torch.Tensor[number of sample, number of classes]