eason
79db6e5c96
新增锂电池剩余使用寿命预测模型RUL-Mamba，包含以下主要组件： 1. 添加Mamba模块作为核心时序建模组件 2. 实现特征注意力网络(FAN)和门控残差网络(GRN) 3. 新增数据预处理和归一化层 4. 添加模型训练和评估脚本 5. 补充README文档说明使用方法 6. 添加可视化辅助工具Helper_Plot.py 7. 实现多种时间序列处理层(Embedding、AutoCorrelation等) 8. 添加配置文件requirements.txt 9. 补充测试数据集TJU battery data
348 lines
14 KiB
Python
348 lines
14 KiB
Python
import torch
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import torch.nn as nn
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import torch.nn.functional as F
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import torch.fft
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import math
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from pytorch_forecasting.models import BaseModel
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from typing import Dict
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class PositionalEmbedding(nn.Module):
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def __init__(self, d_model, max_len=5000):
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super(PositionalEmbedding, self).__init__()
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# Compute the positional encodings once in log space.
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pe = torch.zeros(max_len, d_model).float()
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pe.require_grad = False
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position = torch.arange(0, max_len).float().unsqueeze(1)
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div_term = (torch.arange(0, d_model, 2).float()
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* -(math.log(10000.0) / d_model)).exp()
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pe[:, 0::2] = torch.sin(position * div_term)
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pe[:, 1::2] = torch.cos(position * div_term)
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pe = pe.unsqueeze(0)
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self.register_buffer('pe', pe)
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def forward(self, x):
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return self.pe[:, :x.size(1)]
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class TokenEmbedding(nn.Module):
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def __init__(self, c_in, d_model):
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super(TokenEmbedding, self).__init__()
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padding = 1 if torch.__version__ >= '1.5.0' else 2
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self.tokenConv = nn.Conv1d(in_channels=c_in, out_channels=d_model,
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kernel_size=3, padding=padding, padding_mode='circular', bias=False)
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for m in self.modules():
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if isinstance(m, nn.Conv1d):
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nn.init.kaiming_normal_(
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m.weight, mode='fan_in', nonlinearity='leaky_relu')
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def forward(self, x):
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x = self.tokenConv(x.permute(0, 2, 1)).transpose(1, 2)
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return x
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class FixedEmbedding(nn.Module):
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def __init__(self, c_in, d_model):
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super(FixedEmbedding, self).__init__()
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w = torch.zeros(c_in, d_model).float()
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w.require_grad = False
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position = torch.arange(0, c_in).float().unsqueeze(1)
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div_term = (torch.arange(0, d_model, 2).float()
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* -(math.log(10000.0) / d_model)).exp()
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w[:, 0::2] = torch.sin(position * div_term)
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w[:, 1::2] = torch.cos(position * div_term)
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self.emb = nn.Embedding(c_in, d_model)
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self.emb.weight = nn.Parameter(w, requires_grad=False)
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def forward(self, x):
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return self.emb(x).detach()
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class TemporalEmbedding(nn.Module):
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def __init__(self, d_model, embed_type='fixed', freq='h'):
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super(TemporalEmbedding, self).__init__()
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minute_size = 4
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hour_size = 24
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weekday_size = 7
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day_size = 32
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month_size = 13
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Embed = FixedEmbedding if embed_type == 'fixed' else nn.Embedding
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if freq == 't':
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self.minute_embed = Embed(minute_size, d_model)
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self.hour_embed = Embed(hour_size, d_model)
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self.weekday_embed = Embed(weekday_size, d_model)
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self.day_embed = Embed(day_size, d_model)
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self.month_embed = Embed(month_size, d_model)
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def forward(self, x):
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x = x.long()
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minute_x = self.minute_embed(x[:, :, 4]) if hasattr(
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self, 'minute_embed') else 0.
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hour_x = self.hour_embed(x[:, :, 3])
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weekday_x = self.weekday_embed(x[:, :, 2])
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day_x = self.day_embed(x[:, :, 1])
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month_x = self.month_embed(x[:, :, 0])
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return hour_x + weekday_x + day_x + month_x + minute_x
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class TimeFeatureEmbedding(nn.Module):
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def __init__(self, d_model, embed_type='timeF', freq='h'):
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super(TimeFeatureEmbedding, self).__init__()
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freq_map = {'h': 4, 't': 5, 's': 6,
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'm': 1, 'a': 1, 'w': 2, 'd': 3, 'b': 3}
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d_inp = freq_map[freq]
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self.embed = nn.Linear(d_inp, d_model, bias=False)
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def forward(self, x):
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return self.embed(x)
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class DataEmbedding(nn.Module):
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def __init__(self, c_in, d_model, embed_type='fixed', freq='h', dropout=0.1):
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super(DataEmbedding, self).__init__()
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self.value_embedding = TokenEmbedding(c_in=c_in, d_model=d_model)
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self.position_embedding = PositionalEmbedding(d_model=d_model)
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self.temporal_embedding = TemporalEmbedding(d_model=d_model, embed_type=embed_type,
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freq=freq) if embed_type != 'timeF' else TimeFeatureEmbedding(
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d_model=d_model, embed_type=embed_type, freq=freq)
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self.dropout = nn.Dropout(p=dropout)
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def forward(self, x, x_mark):
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if x_mark is None:
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x = self.value_embedding(x) + self.position_embedding(x)
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else:
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x = self.value_embedding(
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x) + self.temporal_embedding(x_mark) + self.position_embedding(x)
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return self.dropout(x)
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class Inception_Block_V1(nn.Module):
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def __init__(self, in_channels, out_channels, num_kernels=6, init_weight=True):
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super(Inception_Block_V1, self).__init__()
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self.in_channels = in_channels
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self.out_channels = out_channels
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self.num_kernels = num_kernels
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kernels = []
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for i in range(self.num_kernels):
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kernels.append(nn.Conv2d(in_channels, out_channels, kernel_size=2 * i + 1, padding=i))
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self.kernels = nn.ModuleList(kernels)
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if init_weight:
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self._initialize_weights()
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def _initialize_weights(self):
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for m in self.modules():
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if isinstance(m, nn.Conv2d):
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nn.init.kaiming_normal_(m.weight, mode='fan_out', nonlinearity='relu')
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if m.bias is not None:
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nn.init.constant_(m.bias, 0)
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def forward(self, x):
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res_list = []
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for i in range(self.num_kernels):
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res_list.append(self.kernels[i](x))
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res = torch.stack(res_list, dim=-1).mean(-1)
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return res
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def FFT_for_Period(x, k=2):
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# [B, T, C]
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xf = torch.fft.rfft(x, dim=1)
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# find period by amplitudes
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frequency_list = abs(xf).mean(0).mean(-1)
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frequency_list[0] = 0
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_, top_list = torch.topk(frequency_list, k)
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top_list = top_list.detach().cpu().numpy()
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period = x.shape[1] // top_list
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return period, abs(xf).mean(-1)[:, top_list]
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class TimesBlock(nn.Module):
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def __init__(self, seq_len,pred_len,top_k,d_model,d_ff,num_kernels):
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super(TimesBlock, self).__init__()
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self.seq_len = seq_len
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self.pred_len = pred_len
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self.k = top_k
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# parameter-efficient design
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self.conv = nn.Sequential(
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Inception_Block_V1(d_model, d_ff, num_kernels=num_kernels),
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nn.GELU(),
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Inception_Block_V1(d_ff, d_model, num_kernels=num_kernels)
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)
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def forward(self, x):
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B, T, N = x.size()
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period_list, period_weight = FFT_for_Period(x, self.k)
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res = []
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for i in range(self.k):
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period = period_list[i]
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# padding
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if (self.seq_len + self.pred_len) % period != 0:
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length = (((self.seq_len + self.pred_len) // period) + 1) * period
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padding = torch.zeros([x.shape[0], (length - (self.seq_len + self.pred_len)), x.shape[2]]).to(x.device)
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out = torch.cat([x, padding], dim=1)
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else:
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length = (self.seq_len + self.pred_len)
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out = x
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# reshape
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out = out.reshape(B, length // period, period,
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N).permute(0, 3, 1, 2).contiguous()
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# 2D conv: from 1d Variation to 2d Variation
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out = self.conv(out)
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# reshape back
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out = out.permute(0, 2, 3, 1).reshape(B, -1, N)
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res.append(out[:, :(self.seq_len + self.pred_len), :])
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res = torch.stack(res, dim=-1)
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# adaptive aggregation
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period_weight = F.softmax(period_weight, dim=1)
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period_weight = period_weight.unsqueeze(
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1).unsqueeze(1).repeat(1, T, N, 1)
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res = torch.sum(res * period_weight, -1)
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# residual connection
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res = res + x
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return res
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class TimesNet(nn.Module):
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"""
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Paper link: https://openreview.net/pdf?id=ju_Uqw384Oq
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"""
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def __init__(self, seq_len=24, label_len=0, pred_len=1, enc_in=7, dec_in=7, c_out=1, e_layers=2, d_layers=1, factor=3, d_model=16, d_ff=32, des='Exp', itr=1, top_k=5,embed='timeF',freq='h', dropout=0.1,num_kernels=6 ):
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super(TimesNet, self).__init__()
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self.task_name = 'TimesNet'
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self.seq_len = seq_len
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self.label_len = label_len
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self.pred_len = pred_len
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self.model = nn.ModuleList([TimesBlock(seq_len,pred_len,top_k,d_model,d_ff,num_kernels)
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for _ in range(e_layers)])
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self.enc_embedding = DataEmbedding(enc_in, d_model, embed, freq, dropout)
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self.layer = e_layers
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self.layer_norm = nn.LayerNorm(d_model)
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self.predict_linear = nn.Linear(self.seq_len, self.pred_len+ self.seq_len)
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self.projection = nn.Linear(d_model, c_out, bias=True)
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def forward(self, x_enc, x_mark_enc=None):
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'''
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:param x_enc: torch.Size([32, 96, 7])
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:param x_mark_enc: torch.Size([32, 96, 4])
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:param x_dec: torch.Size([32, 144, 7])
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:param x_mark_dec: torch.Size([32, 144, 4])
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:return:
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'''
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# Normalization from Non-stationary Transformer 减均值除方差
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means = x_enc.mean(1, keepdim=True).detach()
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x_enc = x_enc - means
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stdev = torch.sqrt(torch.var(x_enc, dim=1, keepdim=True, unbiased=False) + 1e-5)
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x_enc /= stdev
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target_mean = means[:, :, -1]
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target_stdev = stdev[:, :, -1]
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# embedding
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'''
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self.enc_embedding:
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DataEmbedding(
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(value_embedding): TokenEmbedding(
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(tokenConv): Conv1d(7, 16, kernel_size=(3,), stride=(1,), padding=(1,), bias=False, padding_mode=circular)
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)
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(position_embedding): PositionalEmbedding()
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(temporal_embedding): TimeFeatureEmbedding(
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(embed): Linear(in_features=4, out_features=16, bias=False)
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)
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(dropout): Dropout(p=0.1, inplace=False)
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)
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'''
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enc_out = self.enc_embedding(x_enc, x_mark_enc) # [B,T,C] x_mark_enc=None
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'''
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self.predict_linear:
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Linear(in_features=96, out_features=192, bias=True)
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enc_out :[100,96,16] -> [100,16,96]-> [100,16,192]->[100,192,16]
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'''
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enc_out = self.predict_linear(enc_out.permute(0, 2, 1)).permute(0, 2, 1) # align temporal dimension
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# TimesNet
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'''
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self.model[i]:
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TimesBlock(
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(conv): Sequential(
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(0): Inception_Block_V1(
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(kernels): ModuleList(
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(0): Conv2d(16, 32, kernel_size=(1, 1), stride=(1, 1))
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(1): Conv2d(16, 32, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))
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(2): Conv2d(16, 32, kernel_size=(5, 5), stride=(1, 1), padding=(2, 2))
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(3): Conv2d(16, 32, kernel_size=(7, 7), stride=(1, 1), padding=(3, 3))
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(4): Conv2d(16, 32, kernel_size=(9, 9), stride=(1, 1), padding=(4, 4))
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(5): Conv2d(16, 32, kernel_size=(11, 11), stride=(1, 1), padding=(5, 5))
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)
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)
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(1): GELU(approximate=none)
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(2): Inception_Block_V1(
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(kernels): ModuleList(
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(0): Conv2d(32, 16, kernel_size=(1, 1), stride=(1, 1))
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(1): Conv2d(32, 16, kernel_size=(3, 3), stride=(1, 1), padding=(1, 1))
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(2): Conv2d(32, 16, kernel_size=(5, 5), stride=(1, 1), padding=(2, 2))
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(3): Conv2d(32, 16, kernel_size=(7, 7), stride=(1, 1), padding=(3, 3))
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(4): Conv2d(32, 16, kernel_size=(9, 9), stride=(1, 1), padding=(4, 4))
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(5): Conv2d(32, 16, kernel_size=(11, 11), stride=(1, 1), padding=(5, 5))
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)
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)
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self.layer_norm:
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LayerNorm((16,), eps=1e-05, elementwise_affine=True)
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'''
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for i in range(self.layer):
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enc_out = self.layer_norm(self.model[i](enc_out))
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# porject back
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'''
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self.projection:
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Linear(in_features=16, out_features=7, bias=True)
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enc_out: [100, 97, 16]-> [100, 97, 1]
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'''
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dec_out = self.projection(enc_out) # torch.Size([100, 34, 16])-> torch.Size([100, 34, 1])
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dec_out=dec_out*target_stdev.unsqueeze(1).repeat(1, self.pred_len + self.seq_len, 1)+target_mean.unsqueeze(1).repeat(1, self.pred_len + self.seq_len, 1)
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return dec_out[:, -self.pred_len:, :]
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class TimesNetModel(BaseModel):
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def __init__(self,seq_len=24, label_len=0, pred_len=1, enc_in=7, dec_in=7, c_out=1, e_layers=2, d_layers=1, factor=3, d_model=16, d_ff=32, des='Exp', itr=1, top_k=5,embed='timeF',freq='h', dropout=0.1,num_kernels=6, **kwargs):
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# saves arguments in signature to `.hparams` attribute, mandatory call - do not skip this
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self.save_hyperparameters()
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# pass additional arguments to BaseModel.__init__, mandatory call - do not skip this
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super().__init__(**kwargs)
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self.network = TimesNet(
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seq_len=seq_len, label_len=label_len, pred_len=pred_len, enc_in=enc_in, dec_in=dec_in, c_out=c_out, e_layers=e_layers, d_layers=d_layers, factor=factor,
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d_model=d_model, d_ff=d_ff, des=des, itr=itr, top_k=top_k, embed=embed, freq=freq, dropout=dropout, num_kernels=num_kernels
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)
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# 修改，锂电池预测
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def forward(self, x: Dict[str, torch.Tensor]) -> Dict[str, torch.Tensor]:
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x_enc = x["encoder_cont"][:,:,:-1] # torch.Size([100, 10, 9])
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# 输出
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prediction = self.network(x_enc)
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# 输出rescale， rescale predictions into target space
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prediction = self.transform_output(prediction, target_scale=x["target_scale"])
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# 返回一个字典，包含输出结果（prediction）
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return self.to_network_output(prediction=prediction)
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if __name__=='__main__':
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N,L,C=100,96,5
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input=torch.ones((N,L,C))
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model=TimesNet(seq_len=L, enc_in=C, pred_len=1)
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out=model(input)
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print(out.shape) |