PyTorch Geometric Temporal is a deep learning library for neural spatiotemporal signal processing. This library is an open-source project. It consists of various dynamic and temporal geometric deep learning, embedding, and Spatiotemporal regression methods from a variety of published research papers. In addition, it comes with an easy-to-use dataset loader, an iterator for dynamic and temporal graphs, and gpu-support. It also comes with a number of benchmark datasets with temporal and dynamic graphs (you can also create your own datasets). In the following, we will overview a case study where l can be used to solve a real-world relevant machine learning problem. PyTorch Geometric Tempora Learning from a Discrete Temporal Signal We are using the Hungarian Chickenpox Cases dataset in this case study. We will train a regressor to predict the weekly cases reported by the counties using a recurrent graph convolutional network. First, we will load the dataset and create an appropriate spatio-temporal split. torch_geometric_temporal.data.dataset ChickenpoxDatasetLoader torch_geometric_temporal.data.splitter discrete_train_test_split

loader = ChickenpoxDatasetLoader()

dataset = loader.get_dataset()

train_dataset, test_dataset = discrete_train_test_split(dataset, train_ratio= ) from import from import 0.2 Next, we will define the architecture used for solving the supervised task. The constructor defines a DCRNN layer and a feedforward layer. It is important to note that the final non-linearity is not integrated into the recurrent graph convolutional operation. This design principle is used consistently and it was taken from PyTorch Geometric. recurrent graph neural network Because of this, we defined a ReLU non-linearity between the recurrent and linear layers manually. The final linear layer is not followed by a non-linearity as we solve a regression problem. In the next steps, we will define the architecture used for solving the supervised task. recurrent graph neural network torch torch.nn.functional F torch_geometric_temporal.nn.recurrent DCRNN super(RecurrentGCN, self).__init__()
        self.recurrent = DCRNN(node_features, , )
        self.linear = torch.nn.Linear( , ) h = self.recurrent(x, edge_index, edge_weight)
        h = F.relu(h)
        h = self.linear(h) h import import as from import : class RecurrentGCN (torch.nn.Module) : def __init__ (self, node_features) 32 1 32 1 : def forward (self, x, edge_index, edge_weight) return Let us define a model (we have 4 node features) and train the model on the training split (first 20% of the temporal snapshots) for 200 epochs. We backpropagate when the loss from every snapshot is accumulated. We will use the with a learning rate of . The function is used for measuring the runtime need for each training epoch. Adam optimizer 0.01 tqdm tqdm tqdm

model = RecurrentGCN(node_features = )

optimizer = torch.optim.Adam(model.parameters(), lr= )

model.train() epoch tqdm(range( )):
    cost = time, snapshot enumerate(train_dataset):
        y_hat = model(snapshot.x, snapshot.edge_index, snapshot.edge_attr)
        cost = cost + torch.mean((y_hat-snapshot.y)** )
    cost = cost / (time+ )
    cost.backward()
    optimizer.step()
    optimizer.zero_grad() from import 4 0.01 for in 200 0 for in 2 1 Using the holdout we will evaluate the performance of the trained recurrent graph convolutional network and calculate the mean squared error across . all of the spatial units and time periods model.eval()
cost = time, snapshot enumerate(test_dataset):
    y_hat = model(snapshot.x, snapshot.edge_index, snapshot.edge_attr)
    cost = cost + torch.mean((y_hat-snapshot.y)** )
cost = cost / (time+ )
cost = cost.item()
print( .format(cost)) Accuracy: 0 for in 2 1 "MSE: {:.4f}" >>> 0.6866 Previously published at https://pytorch-geometric-temporal.readthedocs.io/en/latest/notes/introduction.html

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