162 lines
8.4 KiB
Python
Executable File
162 lines
8.4 KiB
Python
Executable File
import torch
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import torch.nn as nn
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from model.PDG2SEQ.PDG2SeqCell import PDG2SeqCell
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import numpy as np
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class PDG2Seq_Encoder(nn.Module):
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def __init__(self, node_num, dim_in, dim_out, cheb_k, embed_dim, time_dim, num_layers=1):
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super(PDG2Seq_Encoder, self).__init__()
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assert num_layers >= 1, 'At least one DCRNN layer in the Encoder.'
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self.node_num = node_num
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self.input_dim = dim_in
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self.num_layers = num_layers
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self.PDG2Seq_cells = nn.ModuleList()
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self.PDG2Seq_cells.append(PDG2SeqCell(node_num, dim_in, dim_out, cheb_k, embed_dim, time_dim))
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for _ in range(1, num_layers):
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self.PDG2Seq_cells.append(PDG2SeqCell(node_num, dim_out, dim_out, cheb_k, embed_dim, time_dim))
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def forward(self, x, init_state, node_embeddings):
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#shape of x: (B, T, N, D)
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#shape of init_state: (num_layers, B, N, hidden_dim)
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assert x.shape[2] == self.node_num and x.shape[3] == self.input_dim
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seq_length = x.shape[1] #x=[batch,steps,nodes,input_dim]
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current_inputs = x
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output_hidden = []
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for i in range(self.num_layers):
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state = init_state[i] #state=[batch,steps,nodes,input_dim]
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inner_states = []
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for t in range(seq_length): #如果有两层GRU，则第二层的GGRU的输入是前一层的隐藏状态
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state = self.PDG2Seq_cells[i](current_inputs[:, t, :, :], state, [node_embeddings[0][:, t, :], node_embeddings[1][:, t, :], node_embeddings[2]])#state=[batch,steps,nodes,input_dim]
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# state = self.dcrnn_cells[i](current_inputs[:, t, :, :], state,[node_embeddings[0], node_embeddings[1]])
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inner_states.append(state) #一个list，里面是每一步的GRU的hidden状态
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output_hidden.append(state) #每层最后一个GRU单元的hidden状态
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current_inputs = torch.stack(inner_states, dim=1)
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#拼接成完整的上一层GRU的hidden状态，作为下一层GRRU的输入[batch,steps,nodes,hiddensize]
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#current_inputs: the outputs of last layer: (B, T, N, hidden_dim)
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#output_hidden: the last state for each layer: (num_layers, B, N, hidden_dim)
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#last_state: (B, N, hidden_dim)
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return current_inputs, output_hidden
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def init_hidden(self, batch_size):
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init_states = []
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for i in range(self.num_layers):
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init_states.append(self.PDG2Seq_cells[i].init_hidden_state(batch_size))
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return torch.stack(init_states, dim=0) #(num_layers, B, N, hidden_dim)
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class PDG2Seq_Dncoder(nn.Module):
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def __init__(self, node_num, dim_in, dim_out, cheb_k, embed_dim, time_dim, num_layers=1):
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super(PDG2Seq_Dncoder, self).__init__()
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assert num_layers >= 1, 'At least one DCRNN layer in the Decoder.'
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self.node_num = node_num
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self.input_dim = dim_in
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self.num_layers = num_layers
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self.PDG2Seq_cells = nn.ModuleList()
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self.PDG2Seq_cells.append(PDG2SeqCell(node_num, dim_in, dim_out, cheb_k, embed_dim, time_dim))
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for _ in range(1, num_layers):
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self.PDG2Seq_cells.append(PDG2SeqCell(node_num, dim_in, dim_out, cheb_k, embed_dim, time_dim))
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def forward(self, xt, init_state, node_embeddings):
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# xt: (B, N, D)
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# init_state: (num_layers, B, N, hidden_dim)
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assert xt.shape[1] == self.node_num and xt.shape[2] == self.input_dim
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current_inputs = xt
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output_hidden = []
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for i in range(self.num_layers):
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state = self.PDG2Seq_cells[i](current_inputs, init_state[i], [node_embeddings[0], node_embeddings[1], node_embeddings[2]])
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output_hidden.append(state)
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current_inputs = state
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return current_inputs, output_hidden
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class PDG2Seq(nn.Module):
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def __init__(self, args):
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super(PDG2Seq, self).__init__()
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self.num_node = args['num_nodes']
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self.input_dim = args['input_dim']
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self.hidden_dim = args['rnn_units']
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self.output_dim = args['output_dim']
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self.horizon = args['horizon']
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self.num_layers = args['num_layers']
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self.use_D = args['use_day']
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self.use_W = args['use_week']
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self.cl_decay_steps = args['lr_decay_step']
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self.node_embeddings1 = nn.Parameter(torch.empty(self.num_node, args['embed_dim']))
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self.T_i_D_emb1 = nn.Parameter(torch.empty(288, args['time_dim']))
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self.D_i_W_emb1 = nn.Parameter(torch.empty(7, args['time_dim']))
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self.T_i_D_emb2 = nn.Parameter(torch.empty(288, args['time_dim']))
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self.D_i_W_emb2 = nn.Parameter(torch.empty(7, args['time_dim']))
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self.encoder = PDG2Seq_Encoder(args['num_nodes'], args['input_dim'], args['rnn_units'], args['cheb_k'],
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args['embed_dim'], args['time_dim'], args['num_layers'])
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self.decoder = PDG2Seq_Dncoder(args['num_nodes'], args['input_dim'], args['rnn_units'], args['cheb_k'],
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args['embed_dim'], args['time_dim'], args['num_layers'])
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self.proj = nn.Sequential(nn.Linear(self.hidden_dim, self.output_dim, bias=True))
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self.end_conv = nn.Conv2d(1, args['horizon'] * self.output_dim, kernel_size=(1, self.hidden_dim), bias=True)
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def forward(self, source, traget=None, batches_seen=None):
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#source: B, T_1, N, D
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#target: B, T_2, N, D
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t_i_d_data1 = source[..., 0,-2]
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t_i_d_data2 = traget[..., 0,-2]
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# T_i_D_emb = self.T_i_D_emb[(t_i_d_data[:, -1, :] * 288).type(torch.LongTensor)]
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T_i_D_emb1_en = self.T_i_D_emb1[(t_i_d_data1 * 288).type(torch.LongTensor)]
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T_i_D_emb2_en = self.T_i_D_emb2[(t_i_d_data1 * 288).type(torch.LongTensor)]
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T_i_D_emb1_de = self.T_i_D_emb1[(t_i_d_data2 * 288).type(torch.LongTensor)]
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T_i_D_emb2_de = self.T_i_D_emb2[(t_i_d_data2 * 288).type(torch.LongTensor)]
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if self.use_W:
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d_i_w_data1 = source[..., 0,-1]
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d_i_w_data2 = traget[..., 0,-1]
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# D_i_W_emb = self.D_i_W_emb[(d_i_w_data[:, -1, :]).type(torch.LongTensor)]
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D_i_W_emb1_en = self.D_i_W_emb1[(d_i_w_data1).type(torch.LongTensor)]
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D_i_W_emb2_en = self.D_i_W_emb2[(d_i_w_data1).type(torch.LongTensor)]
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D_i_W_emb1_de = self.D_i_W_emb1[(d_i_w_data2).type(torch.LongTensor)]
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D_i_W_emb2_de = self.D_i_W_emb2[(d_i_w_data2).type(torch.LongTensor)]
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node_embedding_en1 = torch.mul(T_i_D_emb1_en, D_i_W_emb1_en)
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node_embedding_en2 = torch.mul(T_i_D_emb2_en, D_i_W_emb2_en)
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node_embedding_de1 = torch.mul(T_i_D_emb1_de, D_i_W_emb1_de)
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node_embedding_de2 = torch.mul(T_i_D_emb2_de, D_i_W_emb2_de)
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else:
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node_embedding_en1 = T_i_D_emb1_en
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node_embedding_en2 = T_i_D_emb2_en
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node_embedding_de1 = T_i_D_emb1_de
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node_embedding_de2 = T_i_D_emb2_de
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en_node_embeddings=[node_embedding_en1, node_embedding_en2, self.node_embeddings1]
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source = source[..., 0].unsqueeze(-1)
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init_state = self.encoder.init_hidden(source.shape[0]).to(source.device) # [2,64,307,64] 前面是2是因为有两层GRU
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state, _ = self.encoder(source, init_state, en_node_embeddings) # B, T, N, hidden
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state = state[:, -1:, :, :].squeeze(1)
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ht_list = [state] * self.num_layers
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go = torch.zeros((source.shape[0], self.num_node, self.output_dim), device=source.device)
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out = []
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for t in range(self.horizon):
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state, ht_list = self.decoder(go, ht_list, [node_embedding_de1[:, t, :], node_embedding_de2[:, t, :], self.node_embeddings1])
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go = self.proj(state)
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out.append(go)
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if self.training: #这里的课程学习用了给予一定概率用真实值代替预测值来学习的教师-学生学习法（名字忘了，大概跟着有关）
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c = np.random.uniform(0, 1)
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if c < self._compute_sampling_threshold(batches_seen): #如果满足条件，则用真实值代替预测值训练
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go = traget[:, t, :, 0].unsqueeze(-1)
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output = torch.stack(out, dim=1)
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return output
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def _compute_sampling_threshold(self, batches_seen):
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x = self.cl_decay_steps / (
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self.cl_decay_steps + np.exp(batches_seen / self.cl_decay_steps))
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return x
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