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

根据你提供的代码，SA_modules中包含了两个子模块：PointnetSAModuleMSG和SelfAttention。其中，PointnetSAModuleMSG的定义中没有channel_out参数，而SelfAttention的定义中需要channel_out参数。因此，我猜测你在使用SA_modules时传递了多余的参数channel_out，导致程序报错。

为了解决这个问题，你可以尝试修改SA_modules的定义代码块，将SelfAttention作为PointnetSAModuleMSG的子模块，如下所示：

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,
            self_attention=True,  # 添加self_attention参数
            channel_out=channel_out  # 添加channel_out参数
        )
    )
)

然后在调用SA_modules时，只需要传递两个参数（xyz和features）即可，如下所示：

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)

这样修改之后，你的代码应该就能够正常运行了。