question about GCN module

[cymqqqq]

class GCN(nn.Module):
def init(self, num_state, num_node, bias=False):
super(GCN, self).init()
self.conv1 = nn.Conv1d(num_node, num_node, kernel_size=1) // why conv1d ?
self.relu = nn.ReLU(inplace=True)
self.conv2 = nn.Conv1d(num_state, num_state, kernel_size=1, bias=bias) //?

def forward(self, x):
    h = self.conv1(x.permute(0, 2, 1)).permute(0, 2, 1)
    h = h - x
    h = self.relu(self.conv2(h))
    return h