Deep-Agent API参考手册
概述
本章提供Deep-Agent框架的详细API参考,包括核心模块、类和方法的说明。
核心模块
1. torch.nn模块
PyTorch神经网络模块。
基础层
python
import torch.nn as nn
# 线性层
nn.Linear(in_features, out_features, bias=True)
# 卷积层
nn.Conv1d(in_channels, out_channels, kernel_size)
nn.Conv2d(in_channels, out_channels, kernel_size)
# 循环层
nn.RNN(input_size, hidden_size, num_layers)
nn.LSTM(input_size, hidden_size, num_layers)
nn.GRU(input_size, hidden_size, num_layers)
# 注意力层
nn.MultiheadAttention(embed_dim, num_heads)激活函数
python
import torch.nn as nn
# ReLU
nn.ReLU()
# Sigmoid
nn.Sigmoid()
# Tanh
nn.Tanh()
# Softmax
nn.Softmax(dim=None)
# LeakyReLU
nn.LeakyReLU(negative_slope=0.01)损失函数
python
import torch.nn as nn
# 均方误差损失
nn.MSELoss()
# 交叉熵损失
nn.CrossEntropyLoss()
# 二元交叉熵损失
nn.BCELoss()
# KL散度损失
nn.KLDivLoss()2. torch.optim模块
PyTorch优化器模块。
优化器
python
import torch.optim as optim
# SGD优化器
optim.SGD(params, lr=0.01, momentum=0.9)
# Adam优化器
optim.Adam(params, lr=0.001, betas=(0.9, 0.999))
# AdamW优化器
optim.AdamW(params, lr=0.001, weight_decay=0.01)
# RMSprop优化器
optim.RMSprop(params, lr=0.01)学习率调度器
python
import torch.optim.lr_scheduler as lr_scheduler
# 步长调度器
lr_scheduler.StepLR(optimizer, step_size=30, gamma=0.1)
# 余弦退火调度器
lr_scheduler.CosineAnnealingLR(optimizer, T_max=100)
# ReduceLROnPlateau
lr_scheduler.ReduceLROnPlateau(optimizer, mode='min', factor=0.1, patience=10)3. 自定义模块
感知模块
python
import torch
import torch.nn as nn
class PerceptionModule(nn.Module):
"""感知模块"""
def __init__(self, input_dim, hidden_dim, output_dim):
super().__init__()
self.encoder = nn.Sequential(
nn.Linear(input_dim, hidden_dim),
nn.ReLU(),
nn.Linear(hidden_dim, hidden_dim),
nn.ReLU(),
nn.Linear(hidden_dim, output_dim)
)
def forward(self, x):
return self.encoder(x)记忆模块
python
import torch
import torch.nn as nn
class MemoryModule(nn.Module):
"""记忆模块"""
def __init__(self, memory_size, embedding_dim):
super().__init__()
self.memory_size = memory_size
self.embedding_dim = embedding_dim
self.memory = nn.Parameter(torch.randn(memory_size, embedding_dim))
def read(self, query):
"""读取记忆"""
attention = torch.softmax(
torch.mm(query, self.memory.t()), dim=-1
)
return torch.mm(attention, self.memory)
def write(self, value):
"""写入记忆"""
with torch.no_grad():
# 简单的写入策略
self.memory = torch.roll(self.memory, 1, dims=0)
self.memory[0] = value决策模块
python
import torch
import torch.nn as nn
class DecisionModule(nn.Module):
"""决策模块"""
def __init__(self, state_dim, action_dim, hidden_dim=128):
super().__init__()
self.policy = nn.Sequential(
nn.Linear(state_dim, hidden_dim),
nn.ReLU(),
nn.Linear(hidden_dim, action_dim),
nn.Softmax(dim=-1)
)
self.value = nn.Sequential(
nn.Linear(state_dim, hidden_dim),
nn.ReLU(),
nn.Linear(hidden_dim, 1)
)
def forward(self, state):
action_probs = self.policy(state)
state_value = self.value(state)
return action_probs, state_value规划模块
python
import torch
import torch.nn as nn
class PlanningModule(nn.Module):
"""规划模块"""
def __init__(self, state_dim, action_dim, plan_length):
super().__init__()
self.plan_length = plan_length
self.planner = nn.Sequential(
nn.Linear(state_dim, 128),
nn.ReLU(),
nn.Linear(128, plan_length * action_dim)
)
def forward(self, state):
plan = self.planner(state)
plan = plan.view(-1, self.plan_length, plan.size(-1) // self.plan_length)
return plan常用方法
1. 模型训练
python
import torch
import torch.nn as nn
import torch.optim as optim
def train_model(model, train_loader, epochs=10, lr=0.001):
"""训练模型"""
criterion = nn.CrossEntropyLoss()
optimizer = optim.Adam(model.parameters(), lr=lr)
for epoch in range(epochs):
model.train()
total_loss = 0
for batch_idx, (data, target) in enumerate(train_loader):
optimizer.zero_grad()
output = model(data)
loss = criterion(output, target)
loss.backward()
optimizer.step()
total_loss += loss.item()
avg_loss = total_loss / len(train_loader)
print(f'Epoch [{epoch+1}/{epochs}], Loss: {avg_loss:.4f}')2. 模型评估
python
import torch
def evaluate_model(model, test_loader):
"""评估模型"""
model.eval()
correct = 0
total = 0
with torch.no_grad():
for data, target in test_loader:
output = model(data)
_, predicted = torch.max(output.data, 1)
total += target.size(0)
correct += (predicted == target).sum().item()
accuracy = 100 * correct / total
print(f'Accuracy: {accuracy:.2f}%')
return accuracy3. 模型保存和加载
python
import torch
def save_model(model, path):
"""保存模型"""
torch.save(model.state_dict(), path)
def load_model(model, path):
"""加载模型"""
model.load_state_dict(torch.load(path))
model.eval()
return model4. 设备管理
python
import torch
def get_device():
"""获取设备"""
if torch.cuda.is_available():
return torch.device('cuda')
else:
return torch.device('cpu')
def to_device(model, device):
"""将模型移到设备"""
return model.to(device)配置选项
1. 模型配置
python
model_config = {
'input_dim': 10,
'hidden_dim': 128,
'output_dim': 5,
'num_layers': 3,
'dropout': 0.1
}
model = PerceptionModule(**model_config)2. 训练配置
python
train_config = {
'epochs': 100,
'batch_size': 32,
'learning_rate': 0.001,
'weight_decay': 0.01,
'scheduler': 'cosine'
}3. 记忆配置
python
memory_config = {
'memory_size': 1000,
'embedding_dim': 128,
'read_heads': 4,
'write_heads': 1
}错误处理
1. 模型错误
python
try:
output = model(input)
except RuntimeError as e:
print(f"Runtime error: {e}")
except Exception as e:
print(f"Error: {e}")2. 训练错误
python
try:
loss.backward()
except RuntimeError as e:
if "out of memory" in str(e):
# 处理内存不足
torch.cuda.empty_cache()
else:
raise e最佳实践
1. 模型设计
- 模块化设计:将模型设计为模块化组件
- 可配置性:使用配置文件管理参数
- 可扩展性:设计可扩展的架构
- 可测试性:设计可测试的接口
2. 训练优化
- 梯度累积:处理大batch size
- 混合精度训练:使用FP16加速训练
- 分布式训练:使用多GPU训练
- 早停策略:防止过拟合
3. 部署优化
- 模型量化:减少模型大小
- 模型剪枝:减少计算量
- 模型导出:使用ONNX导出
- 服务化部署:使用TorchServe部署
常见问题
1. 训练问题
- 不收敛:调整学习率、优化器
- 过拟合:增加数据、正则化
- 梯度消失/爆炸:使用残差连接、梯度裁剪
- 训练不稳定:调整超参数
2. 性能问题
- 推理慢:优化模型结构、使用GPU
- 内存占用高:减少模型大小、使用量化
- 计算资源不足:使用分布式训练
3. 部署问题
- 模型导出失败:检查模型结构
- 服务化部署问题:检查依赖和配置
- 边缘部署问题:使用模型压缩
下一步学习
- 架构设计 - Deep-Agent架构设计
- Agent平台与服务 - Agent系统的部署和运维
- 向量数据库 - 向量数据库详解