class Attention(torch.nn.Module): def __init__(self, in_features, out_features): super(Attention, self).__init__() self.lin1 = torch.nn.Linear(in_features, out_features) self.lin2 = torch.nn.Linear(out_features, 1) def forward(self, x): x = F.relu(self.lin1(x)) x = self.lin2(x) return torch.softmax(x, dim=0).view(-1, 1)这段代码是什么样的注意力机制的代码

时间: 2023-06-13 16:06:48 浏览: 186
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Attention(注意力机制代码)

这段代码实现的是一种简单的注意力机制,又称为全局注意力。它的输入是一个张量x,经过两层全连接层后输出一个标量,再经过softmax函数将其转换为注意力分布。这个注意力分布可以应用于输入张量的每个元素,以加权其重要性。具体来说,对于输入张量x,注意力分布的大小与x的每个元素相关,大的元素对应的注意力分布大,小的元素对应的注意力分布小。最终,输出是加权平均值,即x的每个元素乘以对应的注意力分布,再求和。
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import torch import torch.nn as nn from pointnet2_lib.pointnet2.pointnet2_modules import PointnetFPModule, PointnetSAModuleMSG from lib.config import cfg class SelfAttention(nn.Module): def __init__(self, in_channels, reduction=4): super(SelfAttention, self).__init__() self.avg_pool = nn.AdaptiveAvgPool1d(1) self.fc1 = nn.Conv1d(in_channels, in_channels // reduction, 1, bias=False) self.relu = nn.ReLU(inplace=True) self.fc2 = nn.Conv1d(in_channels // reduction, in_channels, 1, bias=False) self.sigmoid = nn.Sigmoid() def forward(self, x): b, c, n = x.size() y = self.avg_pool(x) y = self.fc1(y) y = self.relu(y) y = self.fc2(y) y = self.sigmoid(y) return x * y.expand_as(x) def get_model(input_channels=6, use_xyz=True): return Pointnet2MSG(input_channels=input_channels, use_xyz=use_xyz) class Pointnet2MSG(nn.Module): def __init__(self, input_channels=6, use_xyz=True): super().__init__() self.SA_modules = nn.ModuleList() channel_in = input_channels skip_channel_list = [input_channels] for k in range(cfg.RPN.SA_CONFIG.NPOINTS.len()): mlps = cfg.RPN.SA_CONFIG.MLPS[k].copy() channel_out = 0 for idx in range(mlps.len()): mlps[idx] = [channel_in] + mlps[idx] channel_out += mlps[idx][-1] mlps.append(channel_out) self.SA_modules.append( nn.Sequential( PointnetSAModuleMSG( npoint=cfg.RPN.SA_CONFIG.NPOINTS[k], radii=cfg.RPN.SA_CONFIG.RADIUS[k], nsamples=cfg.RPN.SA_CONFIG.NSAMPLE[k], mlps=mlps, use_xyz=use_xyz, bn=cfg.RPN.USE_BN ), SelfAttention(channel_out) ) ) skip_channel_list.append(channel_out) channel_in = channel_out self.FP_modules = nn.ModuleList() for k in range(cfg.RPN.FP_MLPS.len()): pre_channel = cfg.RPN.FP_MLPS[k + 1][-1] if k + 1 < len(cfg.RPN.FP_MLPS) else channel_out self.FP_modules.append( PointnetFPModule( mlp=[pre_channel + skip_channel_list[k]] + cfg.RPN.FP_MLPS[k] ) ) def _break_up_pc(self, pc): xyz = pc[..., 0:3].contiguous() features = ( pc[..., 3:].transpose(1, 2).contiguous() if pc.size(-1) > 3 else None ) return xyz, features def forward(self, pointcloud: torch.cuda.FloatTensor): xyz, features = self._break_up_pc(pointcloud) l_xyz, l_features = [xyz], [features] for i in range(len(self.SA_modules)): li_xyz, li_features = self.SA_modules[i](l_xyz[i], l_features[i]) l_xyz.append(li_xyz) l_features.append(li_features) for i in range(-1, -(len(self.FP_modules) + 1), -1): l_features[i - 1] = self.FP_modules[i]( l_xyz[i - 1], l_xyz[i], l_features[i - 1], l_features[i] ) return l_xyz[0], l_features[0]中的 SA_modules的forward函数接受几个参数,为什么

class SelfAttention(nn.Module): def __init__(self, in_channels, reduction=4): super(SelfAttention, self).__init__() self.avg_pool = nn.AdaptiveAvgPool1d(1) self.fc1 = nn.Conv1d(in_channels, in_channels // reduction, 1, bias=False) self.relu = nn.ReLU(inplace=True) self.fc2 = nn.Conv1d(in_channels // reduction, in_channels, 1, bias=False) self.sigmoid = nn.Sigmoid() def forward(self, x): b, c, n = x.size() y = self.avg_pool(x) y = self.fc1(y) y = self.relu(y) y = self.fc2(y) y = self.sigmoid(y) return x * y.expand_as(x) def get_model(input_channels=6, use_xyz=True): return Pointnet2MSG(input_channels=input_channels, use_xyz=use_xyz) class Pointnet2MSG(nn.Module): def __init__(self, input_channels=6, use_xyz=True): super().__init__() self.SA_modules = nn.ModuleList() channel_in = input_channels skip_channel_list = [input_channels] for k in range(cfg.RPN.SA_CONFIG.NPOINTS.len()): mlps = cfg.RPN.SA_CONFIG.MLPS[k].copy() channel_out = 0 for idx in range(mlps.len()): mlps[idx] = [channel_in] + mlps[idx] channel_out += mlps[idx][-1] mlps.append(channel_out) self.SA_modules.append( nn.Sequential( PointnetSAModuleMSG( npoint=cfg.RPN.SA_CONFIG.NPOINTS[k], radii=cfg.RPN.SA_CONFIG.RADIUS[k], nsamples=cfg.RPN.SA_CONFIG.NSAMPLE[k], mlps=mlps, use_xyz=use_xyz, bn=cfg.RPN.USE_BN ), SelfAttention(channel_out) ) ) skip_channel_list.append(channel_out) channel_in = channel_out self.FP_modules = nn.ModuleList() for k in range(cfg.RPN.FP_MLPS.len()): pre_channel = cfg.RPN.FP_MLPS[k + 1][-1] if k + 1 < len(cfg.RPN.FP_MLPS) else channel_out self.FP_modules.append( PointnetFPModule( mlp=[pre_channel + skip_channel_list[k]] + cfg.RPN.FP_MLPS[k] ) ) def _break_up_pc(self, pc): xyz = pc[..., 0:3].contiguous() features = ( pc[..., 3:].transpose(1, 2).contiguous() if pc.size(-1) > 3 else None ) return xyz, features def forward(self, pointcloud: torch.cuda.FloatTensor): xyz, features = self._break_up_pc(pointcloud) l_xyz, l_features = [xyz], [features] for i in range(len(self.SA_modules)): li_xyz, li_features = self.SA_modules[i](l_xyz[i], l_features[i]) l_xyz.append(li_xyz) l_features.append(li_features) for i in range(-1, -(len(self.FP_modules) + 1), -1): l_features[i - 1] = self.FP_modules[i]( l_xyz[i - 1], l_xyz[i], l_features[i - 1], l_features[i] ) return l_xyz[0], l_features[0]在forward函数中,如果我要使用channel_out变量传入SA_modules中,我该如何在forward函数中计算并得到它,再传入SA_modules中,你可以给我详细的代码吗?

class DropBlock_Ske(nn.Module): def __init__(self, num_point, block_size=7): super(DropBlock_Ske, self).__init__() self.keep_prob = 0.0 self.block_size = block_size self.num_point = num_point self.fc_1 = nn.Sequential( nn.Linear(in_features=25, out_features=25, bias=True), nn.ReLU(inplace=True), nn.Linear(in_features=25, out_features=25, bias=True), ) self.fc_2 = nn.Sequential( nn.Linear(in_features=25, out_features=25, bias=True), nn.ReLU(inplace=True), nn.Linear(in_features=25, out_features=25, bias=True), ) self.sigmoid = nn.Sigmoid() def forward(self, input, keep_prob, A): # n,c,t,v self.keep_prob = keep_prob if not self.training or self.keep_prob == 1: return input n, c, t, v = input.size() input_attention_mean = torch.mean(torch.mean(input, dim=2), dim=1).detach() # 32 25 input_attention_max = torch.max(input, dim=2)[0].detach() input_attention_max = torch.max(input_attention_max, dim=1)[0] # 32 25 avg_out = self.fc_1(input_attention_mean) max_out = self.fc_2(input_attention_max) out = avg_out + max_out input_attention_out = self.sigmoid(out).view(n, 1, 1, self.num_point) input_a = input * input_attention_out input_abs = torch.mean(torch.mean( torch.abs(input_a), dim=2), dim=1).detach() input_abs = input_abs / torch.sum(input_abs) * input_abs.numel() gamma = 0.024 M_seed = torch.bernoulli(torch.clamp( input_abs * gamma, min=0, max=1.0)).to(device=input.device, dtype=input.dtype) M = torch.matmul(M_seed, A) M[M > 0.001] = 1.0 M[M < 0.5] = 0.0 mask = (1 - M).view(n, 1, 1, self.num_point) return input * mask * mask.numel() / mask.sum()

self.SA_modules.append( nn.Sequential( PointnetSAModuleMSG( npoint=cfg.RPN.SA_CONFIG.NPOINTS[k], radii=cfg.RPN.SA_CONFIG.RADIUS[k], nsamples=cfg.RPN.SA_CONFIG.NSAMPLE[k], mlps=mlps, use_xyz=use_xyz, bn=cfg.RPN.USE_BN ), SelfAttention(channel_out) ) )这是SA_modules的定义代码块,而 for i in range(len(self.SA_modules)): li_xyz, li_features = self.SA_modules[i](l_xyz[i], l_features[i]) l_xyz.append(li_xyz) l_features.append(li_features)是SA_modules的调用代码块,而这是PointnetSAModuleMSG类的父类的代码:class _PointnetSAModuleBase(nn.Module): def __init__(self): super().__init__() self.npoint = None self.groupers = None self.mlps = None self.pool_method = 'max_pool' def forward(self, xyz: torch.Tensor, features: torch.Tensor = None, new_xyz=None) -> (torch.Tensor, torch.Tensor): """ :param xyz: (B, N, 3) tensor of the xyz coordinates of the features :param features: (B, N, C) tensor of the descriptors of the the features :param new_xyz: :return: new_xyz: (B, npoint, 3) tensor of the new features' xyz new_features: (B, npoint, \sum_k(mlps[k][-1])) tensor of the new_features descriptors """ new_features_list = [] xyz_flipped = xyz.transpose(1, 2).contiguous() if new_xyz is None: new_xyz = pointnet2_utils.gather_operation( xyz_flipped, pointnet2_utils.furthest_point_sample(xyz, self.npoint) ).transpose(1, 2).contiguous() if self.npoint is not None else None for i in range(len(self.groupers)): new_features = self.groupers[i](xyz, new_xyz, features) # (B, C, npoint, nsample) new_features = self.mlps[i](new_features) # (B, mlp[-1], npoint, nsample) if self.pool_method == 'max_pool': new_features = F.max_pool2d( new_features, kernel_size=[1, new_features.size(3)] ) # (B, mlp[-1], npoint, 1) elif self.pool_method == 'avg_pool': new_features = F.avg_pool2d( new_features, kernel_size=[1, new_features.size(3)] ) # (B, mlp[-1], npoint, 1) else: raise NotImplementedError new_features = new_features.squeeze(-1) # (B, mlp[-1], npoint) new_features_list.append(new_features) return new_xyz, torch.cat(new_features_list, dim=1);运行时程序报错提示我在调用SA_modules时传递的三个参数,现在看来应该是多出了参数channel_out,我该怎么修改代码才能让SA_modules顺利接受三个参数并正常运行

class SelfAttention(nn.Module): def init(self, in_channels, reduction=4): super(SelfAttention, self).init() self.avg_pool = nn.AdaptiveAvgPool1d(1) self.fc1 = nn.Conv1d(in_channels, in_channels // reduction, 1, bias=False) self.relu = nn.ReLU(inplace=True) self.fc2 = nn.Conv1d(in_channels // reduction, in_channels, 1, bias=False) self.sigmoid = nn.Sigmoid() def forward(self, x): b, c, n = x.size() y = self.avg_pool(x) y = self.fc1(y) y = self.relu(y) y = self.fc2(y) y = self.sigmoid(y) return x * y.expand_as(x) def get_model(input_channels=6, use_xyz=True): return Pointnet2MSG(input_channels=input_channels, use_xyz=use_xyz) class Pointnet2MSG(nn.Module): def init(self, input_channels=6, use_xyz=True): super().init() self.SA_modules = nn.ModuleList() channel_in = input_channels skip_channel_list = [input_channels] for k in range(cfg.RPN.SA_CONFIG.NPOINTS.len()): mlps = cfg.RPN.SA_CONFIG.MLPS[k].copy() channel_out = 0 for idx in range(mlps.len()): mlps[idx] = [channel_in] + mlps[idx] channel_out += mlps[idx][-1] mlps.append(channel_out) self.SA_modules.append( nn.Sequential( PointnetSAModuleMSG( npoint=cfg.RPN.SA_CONFIG.NPOINTS[k], radii=cfg.RPN.SA_CONFIG.RADIUS[k], nsamples=cfg.RPN.SA_CONFIG.NSAMPLE[k], mlps=mlps, use_xyz=use_xyz, bn=cfg.RPN.USE_BN ), SelfAttention(channel_out) ) ) skip_channel_list.append(channel_out) channel_in = channel_out self.FP_modules = nn.ModuleList() for k in range(cfg.RPN.FP_MLPS.len()): pre_channel = cfg.RPN.FP_MLPS[k + 1][-1] if k + 1 < len(cfg.RPN.FP_MLPS) else channel_out self.FP_modules.append( PointnetFPModule( mlp=[pre_channel + skip_channel_list[k]] + cfg.RPN.FP_MLPS[k] ) ) def _break_up_pc(self, pc): xyz = pc[..., 0:3].contiguous() features = ( pc[..., 3:].transpose(1, 2).contiguous() if pc.size(-1) > 3 else None ) return xyz, features def forward(self, pointcloud: torch.cuda.FloatTensor): xyz, features = self._break_up_pc(pointcloud) l_xyz, l_features = [xyz], [features] for i in range(len(self.SA_modules)): li_xyz, li_features = self.SA_modules[i](l_xyz[i], l_features[i]) l_xyz.append(li_xyz) l_features.append(li_features) for i in range(-1, -(len(self.FP_modules) + 1), -1): l_features[i - 1] = self.FP_modules[i]( l_xyz[i - 1], l_xyz[i], l_features[i - 1], l_features[i] ) return l_xyz[0], l_features[0]在forward函数中,如果我要使用channel_out变量和l_xyz[i], l_features[i]传入SA_modules中,我该如何在forward函数中计算并得到它,再传入SA_modules中,你可以给我详细的代码吗?

self.SA_modules.append( nn.Sequential( PointnetSAModuleMSG( npoint=cfg.RPN.SA_CONFIG.NPOINTS[k], radii=cfg.RPN.SA_CONFIG.RADIUS[k], nsamples=cfg.RPN.SA_CONFIG.NSAMPLE[k], mlps=mlps, use_xyz=use_xyz, bn=cfg.RPN.USE_BN ), SelfAttention(channel_out) ) )这是SA_modules的定义代码块,而 for i in range(len(self.SA_modules)): li_xyz, li_features = self.SA_modules[i](l_xyz[i], l_features[i]) l_xyz.append(li_xyz) l_features.append(li_features)是SA_modules的调用代码块,而这是PointnetSAModuleMSG类的父类的代码:class _PointnetSAModuleBase(nn.Module): def init(self): super().init() self.npoint = None self.groupers = None self.mlps = None self.pool_method = 'max_pool' def forward(self, xyz: torch.Tensor, features: torch.Tensor = None, new_xyz=None) -> (torch.Tensor, torch.Tensor): """ :param xyz: (B, N, 3) tensor of the xyz coordinates of the features :param features: (B, N, C) tensor of the descriptors of the the features :param new_xyz: :return: new_xyz: (B, npoint, 3) tensor of the new features' xyz new_features: (B, npoint, \sum_k(mlps[k][-1])) tensor of the new_features descriptors """ new_features_list = [] xyz_flipped = xyz.transpose(1, 2).contiguous() if new_xyz is None: new_xyz = pointnet2_utils.gather_operation( xyz_flipped, pointnet2_utils.furthest_point_sample(xyz, self.npoint) ).transpose(1, 2).contiguous() if self.npoint is not None else None for i in range(len(self.groupers)): new_features = self.groupers[i](xyz, new_xyz, features) # (B, C, npoint, nsample) new_features = self.mlpsi # (B, mlp[-1], npoint, nsample) if self.pool_method == 'max_pool': new_features = F.max_pool2d( new_features, kernel_size=[1, new_features.size(3)] ) # (B, mlp[-1], npoint, 1) elif self.pool_method == 'avg_pool': new_features = F.avg_pool2d( new_features, kernel_size=[1, new_features.size(3)] ) # (B, mlp[-1], npoint, 1) else: raise NotImplementedError new_features = new_features.squeeze(-1) # (B, mlp[-1], npoint) new_features_list.append(new_features) return new_xyz, torch.cat(new_features_list, dim=1);运行时程序报错提示我在调用SA_modules时传递的三个参数,现在看来应该是多出了参数channel_out,我该怎么修改代码才能让SA_modules顺利接受三个参数并正常运行

class SelfAttention(nn.Module): def init(self, input_size=1, num_heads=1): super(SelfAttention, self).init() self.num_heads = 1 self.head_size = 1 self.query = nn.Linear(1, 1) self.key = nn.Linear(1, 1) self.value = nn.Linear(1, 1) self.out = nn.Linear(1, 1) def forward(self, inputs): batch_size, seq_len, input_size = inputs.size() # 128 706 1 # Split inputs into num_heads inputs = inputs.view(batch_size, seq_len, self.num_heads, self.head_size) inputs = inputs.permute(0, 2, 1, 3).contiguous() queries = self.query(inputs).view(batch_size, self.num_heads, seq_len, self.head_size) keys = self.key(inputs).view(batch_size, self.num_heads, seq_len, self.head_size) values = self.value(inputs).view(batch_size, self.num_heads, seq_len, self.head_size) # Compute attention scores scores = torch.matmul(queries, keys.permute(0, 1, 3, 2)) scores = scores / (self.head_size ** 0.5) attention = F.softmax(scores, dim=-1) # Apply attention weights to values attention_output = torch.matmul(attention, values) attention_output = attention_output.view(batch_size, seq_len, input_size) # Apply output linear layer output = self.out(attention_output) return output class DenseAttentionLayer(nn.Module): def init(self, input_size, return_alphas=True, name=None, num_heads=1): super(DenseAttentionLayer, self).init() self.return_alphas = return_alphas self.name = name self.num_heads = num_heads # If input comes with a hidden dimension (e.g. 5 features per gene) # print("len(input_size): ",len(input_size)) # 2 if len(input_size) == 3: self.feature_collapse = nn.Linear(input_size[-1], 1) input_size = (input_size[0], input_size[1]) self.attention = SelfAttention(input_size=1, num_heads=1) def forward(self, inputs): print("inputs.shape: ",inputs.shape) # torch.Size([128, 706]) output = self.attention(inputs) if self.return_alphas: alphas = F.softmax(output, dim=1) return torch.mul(inputs, alphas), alphas else: return output 对于上述代码其中numheads=1 headsize=1

class PointnetSAModuleMSG(_PointnetSAModuleBase): """ Pointnet set abstraction layer with multiscale grouping and attention mechanism """ def init(self, *, npoint: int, radii: List[float], nsamples: List[int], mlps: List[List[int]], bn: bool = True, use_xyz: bool = True, pool_method='max_pool', instance_norm=False): """ :param npoint: int :param radii: list of float, list of radii to group with :param nsamples: list of int, number of samples in each ball query :param mlps: list of list of int, spec of the pointnet before the global pooling for each scale :param bn: whether to use batchnorm :param use_xyz: :param pool_method: max_pool / avg_pool :param instance_norm: whether to use instance_norm """ super().init() assert len(radii) == len(nsamples) == len(mlps) self.npoint = npoint self.groupers = nn.ModuleList() self.mlps = nn.ModuleList() # Add attention module self.attentions = nn.ModuleList() for i in range(len(radii)): radius = radii[i] nsample = nsamples[i] self.groupers.append( pointnet2_utils.QueryAndGroup(radius, nsample, use_xyz=use_xyz) if npoint is not None else pointnet2_utils.GroupAll(use_xyz) ) mlp_spec = mlps[i] if use_xyz: mlp_spec[0] += 3 # Add attention module for each scale self.attentions.append(Attention(mlp_spec[-1])) self.mlps.append(pt_utils.SharedMLP(mlp_spec, bn=bn, instance_norm=instance_norm)) self.pool_method = pool_method def forward(self, xyz, features): """ :param xyz: (B, N, 3) xyz coordinates of the points :param features: (B, N, C) input features :return: (B, npoint, mlp[-1]) tensor """ new_features_list = [] for i in range(len(self.groupers)): grouper = self.groupers[i] mlp = self.mlps[i] attention = self.attentions[i] # Group points and features grouped_xyz, grouped_features = grouper(xyz, features) # Apply MLP to each group grouped_features = mlp(grouped_features) # Apply attention mechanism to the features of each group grouped_features = attention(grouped_features) # Perform pooling over each group if self.pool_method == 'max_pool': pooled_features = torch.max(grouped_features, dim=2)[0] else: pooled_features = torch.mean(grouped_features, dim=2) new_features_list.append(pooled_features) # Concatenate features from different scales new_features = torch.cat(new_features_list, dim=1) return new_features在该类中使用的QueryAndGroup类会主动将该类所继承的父类的返回值传入QueryAndGroup类中的forward函数吗

class PointnetSAModuleMSG(_PointnetSAModuleBase): """Pointnet set abstraction layer with multiscale grouping""" def __init__(self, *, npoint: int, radii: List[float], nsamples: List[int], mlps: List[List[int]], bn: bool = True, use_xyz: bool = True, pool_method='max_pool', instance_norm=False): """ :param npoint: int :param radii: list of float, list of radii to group with :param nsamples: list of int, number of samples in each ball query :param mlps: list of list of int, spec of the pointnet before the global pooling for each scale :param bn: whether to use batchnorm :param use_xyz: :param pool_method: max_pool / avg_pool :param instance_norm: whether to use instance_norm """ super().__init__() assert len(radii) == len(nsamples) == len(mlps) self.npoint = npoint self.groupers = nn.ModuleList() self.mlps = nn.ModuleList() for i in range(len(radii)): radius = radii[i] nsample = nsamples[i] self.groupers.append( pointnet2_utils.QueryAndGroup(radius, nsample, use_xyz=use_xyz) if npoint is not None else pointnet2_utils.GroupAll(use_xyz) ) mlp_spec = mlps[i] if use_xyz: mlp_spec[0] += 3 self.mlps.append(pt_utils.SharedMLP(mlp_spec, bn=bn, instance_norm=instance_norm)) self.pool_method = pool_method这是PointnetSAModuleMSG的代码,而这是selfattention的代码:class SelfAttention(nn.Module): def __init__(self, in_channels, reduction=4): super(SelfAttention, self).__init__() self.avg_pool = nn.AdaptiveAvgPool1d(1) self.fc1 = nn.Conv1d(in_channels, in_channels // reduction, 1, bias=False) self.relu = nn.ReLU(inplace=True) self.fc2 = nn.Conv1d(in_channels // reduction, in_channels, 1, bias=False) self.sigmoid = nn.Sigmoid() def forward(self, x): b, c, n = x.size() y = self.avg_pool(x) y = self.fc1(y) y = self.relu(y) y = self.fc2(y) y = self.sigmoid(y) return x * y.expand_as(x);我想将SelfAttention作为PointnetSAModuleMSG的子模块,我是为了加入SA注意力机制,所以需要对PointnetSAModuleMSG进行修改。我想在每个SA模块中添加一个注意力机制,以使得网络可以更好地聚焦于重要的点。具体实现方式是在每个SA模块的最后一层MLP后加入一个Self-Attention层,(如SelfAttention类所示)用于计算每个点的注意力分数。你可以给我写出详细的修改代码吗?

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