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| """ EMMI: Edge Multi-Modal Intelligence
边缨端: 编码 + 融合 + 压缩 → 紧凑表征 服务器端: MLLM 推理 → 结果返回
通信量: 原始数据 (GB级) → 压缩表征 (KB级) """
import torch import torch.nn as nn import torch.nn.functional as F from typing import Dict, List, Tuple import numpy as np
class ModalityEncoder(nn.Module): """模态特定编码器""" def __init__(self, input_dim: int, latent_dim: int = 128): super().__init__() self.encoder = nn.Sequential( nn.Linear(input_dim, 256), nn.ReLU(), nn.Linear(256, latent_dim), nn.ReLU(), ) def forward(self, x: torch.Tensor) -> torch.Tensor: return self.encoder(x)
class CrossModalFusion(nn.Module): """ 跨模态特征融合 使用注意力机制融合不同模态的特征 """ def __init__(self, n_modalities: int, latent_dim: int = 128): super().__init__() self.fusion_attention = nn.MultiheadAttention( embed_dim=latent_dim, num_heads=4, batch_first=True ) self.fusion_proj = nn.Sequential( nn.Linear(latent_dim * n_modalities, latent_dim * 2), nn.ReLU(), nn.Linear(latent_dim * 2, latent_dim), nn.LayerNorm(latent_dim) ) def forward(self, modality_features: List[torch.Tensor]) -> torch.Tensor: """ Args: modality_features: 各模态特征列表 [(B, D), ...] Returns: fused: 融合特征 (B, D) """ stacked = torch.stack(modality_features, dim=1) attended, _ = self.fusion_attention(stacked, stacked, stacked) concat = attended.reshape(attacked.shape[0], -1) fused = self.fusion_proj(concat) return fused
class LearnedCompression(nn.Module): """ 学习压缩模块 将融合表征压缩为紧凑潜变量 通信量从 GB 级降到 KB 级 """ def __init__(self, input_dim: int = 128, compress_dim: int = 32): super().__init__() self.encoder = nn.Sequential( nn.Linear(input_dim, 64), nn.ReLU(), nn.Linear(64, compress_dim) ) self.decoder = nn.Sequential( nn.Linear(compress_dim, 64), nn.ReLU(), nn.Linear(64, input_dim) ) def encode(self, x: torch.Tensor) -> torch.Tensor: """边缨端: 压缩""" return self.encoder(x) def decode(self, z: torch.Tensor) -> torch.Tensor: """服务器端: 解压""" return self.decoder(z)
class EMMISystem(nn.Module): """ EMMI 完整系统 边缨端: 多模态编码 → 融合 → 压缩 → 传输 服务器端: 解压 → MLLM 推理 → 结果返回 """ def __init__(self, modality_dims: List[int], latent_dim: int = 128, compress_dim: int = 32): super().__init__() self.n_modalities = len(modality_dims) self.encoders = nn.ModuleList([ ModalityEncoder(dim, latent_dim) for dim in modality_dims ]) self.fusion = CrossModalFusion(self.n_modalities, latent_dim) self.compressor = LearnedCompression(latent_dim, compress_dim) self.mllm_head = nn.Sequential( nn.Linear(latent_dim, 256), nn.ReLU(), nn.Linear(256, 128), nn.ReLU(), nn.Linear(128, 10) ) def edge_forward(self, inputs: List[torch.Tensor]) -> torch.Tensor: """ 边缨端: 编码→融合→压缩 Returns: compressed: 压缩潜变量 (B, compress_dim) - 传输到服务器 """ modality_features = [ enc(x) for enc, x in zip(self.encoders, inputs) ] fused = self.fusion(modality_features) compressed = self.compressor.encode(fused) return compressed def server_forward(self, compressed: torch.Tensor) -> torch.Tensor: """ 服务器端: 解压→MLLM推理 Returns: output: 推理结果 (B, 10) """ decoded = self.compressor.decode(compressed) output = self.mllm_head(decoded) return output def forward(self, inputs: List[torch.Tensor]) -> Dict[str, torch.Tensor]: """完整前向 (边缨+服务器)""" compressed = self.edge_forward(inputs) output = self.server_forward(compressed) original_bytes = sum(x.numel() * 4 for x in inputs) compressed_bytes = compressed.numel() * 4 ratio = original_bytes / compressed_bytes return { 'output': output, 'compressed': compressed, 'original_bytes': original_bytes, 'compressed_bytes': compressed_bytes, 'compression_ratio': ratio }
class IMSEdgeServerSystem: """ IMS 边缘-服务器协同系统 边缨 (QCS8255): 多传感器编码+融合+压缩 服务器 (云端 GPU): MLLM 深度推理 应用场景: 1. 复杂行为理解 (需大模型) 2. 多模态健康评估 3. 自然语言交互 """ def __init__(self): modality_dims = [512, 128, 64, 32, 64] self.system = EMMISystem( modality_dims=modality_dims, latent_dim=128, compress_dim=32 ) def estimate_communication(self, batch_size: int = 1): """估算通信量""" inputs = [torch.randn(batch_size, dim) for dim in [512, 128, 64, 32, 64]] result = self.system(inputs) print("=== EMMI 通信效率 ===") print(f"原始数据量: {result['original_bytes']:,} bytes ({result['original_bytes']/1024:.1f} KB)") print(f"压缩后: {result['compressed_bytes']:,} bytes ({result['compressed_bytes']/1024:.1f} KB)") print(f"压缩比: {result['compression_ratio']:.1f}x") bandwidth_5g = 100e6 original_latency = result['original_bytes'] * 8 / bandwidth_5g * 1000 compressed_latency = result['compressed_bytes'] * 8 / bandwidth_5g * 1000 print(f"\n5G 传输延迟:") print(f" 原始: {original_latency:.2f} ms") print(f" 压缩: {compressed_latency:.2f} ms") print(f" 节省: {original_latency - compressed_latency:.2f} ms")
if __name__ == "__main__": system = IMSEdgeServerSystem() system.estimate_communication() print(f"\n=== 边缘 vs 边缘-服务器 vs EMMI ===") print(f"{'方案':<25} {'延迟':<15} {'精度':<15} {'通信量'}") print(f"{'纯边缨 (小模型)':<25} {'5ms':<15} {'80%':<15} {'0 (本地)'}") print(f"{'纯服务器 (原始数据)':<25} {'50ms':<15} {'95%':<15} {'3.2KB/帧'}") print(f"{'EMMI (压缩)':<25} {'15ms':<15} {'93%':<15} {'128B/帧'}")
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