129 lines
6.2 KiB
Python
Executable File
129 lines
6.2 KiB
Python
Executable File
import torch, torch.nn as nn, torch.nn.functional as F
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from collections import OrderedDict
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class DGCRM(nn.Module):
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def __init__(self, node_num, dim_in, dim_out, cheb_k, embed_dim, num_layers=1):
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super().__init__()
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self.node_num, self.input_dim, self.num_layers = node_num, dim_in, num_layers
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self.cells = nn.ModuleList([
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DDGCRNCell(node_num, dim_in if i == 0 else dim_out, dim_out, cheb_k, embed_dim)
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for i in range(num_layers)
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])
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def forward(self, x, init_state, node_embeddings):
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assert x.shape[2] == self.node_num and x.shape[3] == self.input_dim
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for i in range(self.num_layers):
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state, inner = init_state[i].to(x.device), []
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for t in range(x.shape[1]):
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state = self.cells[i](x[:, t, :, :], state, [node_embeddings[0][:, t, :, :], node_embeddings[1]])
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inner.append(state)
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init_state[i] = state
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x = torch.stack(inner, dim=1)
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return x, init_state
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def init_hidden(self, bs):
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return torch.stack([cell.init_hidden_state(bs) for cell in self.cells], dim=0)
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class EXPB(nn.Module):
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def __init__(self, args):
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super().__init__()
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self.patch_size = args.get('patch_size', 1)
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self.num_node, self.input_dim, self.hidden_dim = args['num_nodes'], args['input_dim'], args['rnn_units']
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self.output_dim, self.horizon, self.num_layers = args['output_dim'], args['horizon'], args['num_layers']
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self.use_day, self.use_week = args['use_day'], args['use_week']
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self.node_embeddings1 = nn.Parameter(torch.randn(self.num_node, args['embed_dim']))
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self.T_i_D_emb = nn.Parameter(torch.empty(288, args['embed_dim']))
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self.D_i_W_emb = nn.Parameter(torch.empty(7, args['embed_dim']))
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self.drop = nn.Dropout(0.1)
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self.encoder = DGCRM(self.num_node, self.input_dim, self.hidden_dim,
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args['cheb_order'], args['embed_dim'], self.num_layers)
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self.base_conv = nn.Conv2d(1, self.horizon * self.output_dim, (1, self.hidden_dim))
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self.res_conv = nn.Conv2d(1, self.horizon * self.output_dim, (1, self.hidden_dim + 1))
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def forward(self, source):
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# source: (B, T, N, D_total)，第0通道为主观测，第1、2通道为时间编码
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B, T, N, D_total = source.shape
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p = self.patch_size
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num_patches = T // p
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source = source[:, :num_patches * p, :, :].view(B, num_patches, p, N, D_total)
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# 对主观测通道取均值，并转置为 (B, num_patches, N, 1)
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inp = source[..., 0].mean(dim=2, keepdim=True).permute(0, 1, 3, 2)
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# 每个 patch 最后时刻的时间编码
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time_day = source[:, :, -1, :, 1] # (B, num_patches, N)
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time_week = source[:, :, -1, :, 2] # (B, num_patches, N)
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patched_source = torch.cat([inp, time_day.unsqueeze(-1), time_week.unsqueeze(-1)], dim=-1)
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node_embed = self.node_embeddings1
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if self.use_day:
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node_embed = node_embed * self.T_i_D_emb[(patched_source[..., 1] * 288).long()]
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if self.use_week:
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node_embed = node_embed * self.D_i_W_emb[patched_source[..., 2].long()]
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node_embeddings = [node_embed, self.node_embeddings1]
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init = self.encoder.init_hidden(B)
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enc_out, _ = self.encoder(inp, init, node_embeddings)
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rep = self.drop(enc_out[:, -1:, :, :])
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base = self.base_conv(rep)
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res_in = torch.cat([rep, inp[:, -1:, :, :]], dim=-1)
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res = self.res_conv(res_in)
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out = base + res
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out = out.squeeze(-1).view(B, self.horizon, self.output_dim, N).permute(0, 1, 3, 2)
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return out
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class DDGCRNCell(nn.Module):
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def __init__(self, node_num, dim_in, dim_out, cheb_k, embed_dim):
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super().__init__()
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self.node_num, self.hidden_dim = node_num, dim_out
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self.gate = DGCN(dim_in + dim_out, 2 * dim_out, cheb_k, embed_dim, node_num)
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self.update = DGCN(dim_in + dim_out, dim_out, cheb_k, embed_dim, node_num)
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self.ln = nn.LayerNorm(dim_out)
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def forward(self, x, state, node_embeddings):
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inp = torch.cat((x, state), -1)
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z_r = torch.sigmoid(self.gate(inp, node_embeddings))
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z, r = torch.split(z_r, self.hidden_dim, -1)
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hc = torch.tanh(self.update(torch.cat((x, z * state), -1), node_embeddings))
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out = r * state + (1 - r) * hc
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return self.ln(out)
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def init_hidden_state(self, bs):
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return torch.zeros(bs, self.node_num, self.hidden_dim)
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class DGCN(nn.Module):
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def __init__(self, dim_in, dim_out, cheb_k, embed_dim, num_nodes):
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super().__init__()
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self.cheb_k, self.embed_dim = cheb_k, embed_dim
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self.weights_pool = nn.Parameter(torch.FloatTensor(embed_dim, cheb_k, dim_in, dim_out))
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self.weights = nn.Parameter(torch.FloatTensor(cheb_k, dim_in, dim_out))
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self.bias_pool = nn.Parameter(torch.FloatTensor(embed_dim, dim_out))
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self.bias = nn.Parameter(torch.FloatTensor(dim_out))
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self.fc = nn.Sequential(OrderedDict([
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('fc1', nn.Linear(dim_in, 16)),
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('sigmoid1', nn.Sigmoid()),
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('fc2', nn.Linear(16, 2)),
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('sigmoid2', nn.Sigmoid()),
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('fc3', nn.Linear(2, embed_dim))
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]))
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self.register_buffer('eye', torch.eye(num_nodes))
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def forward(self, x, node_embeddings):
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supp1 = self.eye.to(node_embeddings[0].device)
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filt = self.fc(x)
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nodevec = torch.tanh(node_embeddings[0] * filt)
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supp2 = self.get_laplacian(F.relu(torch.matmul(nodevec, nodevec.transpose(2, 1))), supp1)
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x_g = torch.stack([
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torch.einsum("nm,bmc->bnc", supp1, x),
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torch.einsum("bnm,bmc->bnc", supp2, x)
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], dim=1)
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weights = torch.einsum('nd,dkio->nkio', node_embeddings[1], self.weights_pool)
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bias = torch.matmul(node_embeddings[1], self.bias_pool)
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return torch.einsum('bnki,nkio->bno', x_g.permute(0, 2, 1, 3), weights) + bias
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@staticmethod
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def get_laplacian(graph, I, normalize=True):
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D_inv = torch.diag_embed(torch.sum(graph, -1) ** (-0.5))
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return torch.matmul(torch.matmul(D_inv, graph), D_inv) if normalize else torch.matmul(
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torch.matmul(D_inv, graph + I), D_inv)
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