Linux v2.13.6源码解析：Posix sysconf()实现细节

版权申诉
return
0 下载量 89 浏览量 更新于2024-10-16 收藏 2KB RAR 举报
资源摘要信息:"minmax_init_list.rar_return"所涉及的两个文件sysconf.c和minmax_init_list.pass.c，主要与Linux操作系统下的系统调用sysconf()相关。sysconf()是POSIX标准定义的系统调用，用于查询系统配置信息，比如可用的最大进程数量、页面大小等。该调用的名称来源是"system configuration"（系统配置）。在Linux v2.13.6版本中，这个调用的源代码被包含在给定的压缩文件中，可能用于研究或教学目的，以便更好地理解Linux内核的早期实现。 标题中的"minmax_init_list.rar_return"暗示这些文件可能是从一个压缩包中提取出来的，而"rar"表明是用WinRAR等工具压缩的RAR格式文件。"return"标签可能表明，这些文件中包含了与系统调用sysconf()相关的返回值信息。 sysconf()函数的典型用法是在程序运行时查询系统配置，以便程序能够根据系统的能力进行适当的调整。例如，如果系统支持的线程数量有限，那么程序在创建线程时应该考虑到这个限制。sysconf()可以在这个时候提供实际的限制值。 在描述中提到了"Posix sysconf() description"，这表明文件可能包含对sysconf()函数的文档描述，以及它返回特定错误码的信息。"most of these will return -1 and ENOSYS"指出在Linux v2.13.6版本中，如果查询的配置项不被支持，sysconf()将返回-1，并且设置errno为ENOSYS（即"Function not supported"，表示调用的函数系统不支持）。 文件名"sysconf.c"可能表明该文件包含了实现sysconf()函数的源代码。根据POSIX标准，sysconf()函数的原型可能如下： ```c #include <unistd.h> long sysconf(int name); ``` 调用sysconf()时，参数name指定了要查询的系统配置选项，它是一个以_SC_为前缀的宏定义。例如，可以查询页面大小： ```c long pagesize = sysconf(_SC_PAGESIZE); ``` 如果系统不支持所请求的配置项，sysconf()将返回-1，并设置errno为相应的错误码，如ENOSYS。 另一个文件"minmax_init_list.pass.c"可能是一个测试用例或示例代码，用于验证sysconf()或其他系统调用在Linux v2.13.6上的行为。"pass"可能意味着该文件的测试案例是通过的，即代码的执行结果符合预期。 在Linux内核开发和维护中，版本号如v2.13.6表示代码库的特定状态。这允许开发者和系统管理员了解和引用特定版本的代码。Linux v2.13.6是一个较旧的版本，对于研究系统调用的历史以及了解早期Linux内核的发展很有帮助。 总结起来，这些文件和信息提供了对Linux系统调用sysconf()的深入了解，涉及其功能、用法、错误处理以及如何在系统编程中使用该系统调用。同时，也展示了Linux内核在早期阶段对POSIX标准的支持情况。对于系统程序员和操作系统研究者来说，这些资料是研究Linux内核、POSIX标准以及早期系统编程实践的宝贵资源。

hm1375_tinav2.1验证通过_增加设备ID的读取显示_20170825_1333没有外层目录.7z

2017-08-25 上传
videobuf_queue_dma_contig_init(&dev->vb_vidq, &vfe_video_qops, NULL, &dev->slock, V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,//default format, can be changed by s_fmt sizeof(struct vfe...

rtl8189es_r16m验证通过20170818_1659没有外层目录.7z

2017-09-01 上传
# device/softwinner/astar-evb30/hawkview/sensor_list_cfg.ini:system/etc/hawkview/sensor_list_cfg.ini # Radio Packages and Configuration Flie $(call inherit-product, device/softwinner/common/rild/...

！！！！rtl8189es_r16m验证通过20170818_1659没有外层目录.zip

2017-09-01 上传
# device/softwinner/astar-evb30/hawkview/sensor_list_cfg.ini:system/etc/hawkview/sensor_list_cfg.ini # Radio Packages and Configuration Flie $(call inherit-product, device/softwinner/common/rild/...

LDAM损失函数pytorch代码如下：class LDAMLoss(nn.Module): def __init__(self, cls_num_list, max_m=0.5, weight=None, s=30): super(LDAMLoss, self).__init__() m_list = 1.0 / np.sqrt(np.sqrt(cls_num_list)) m_list = m_list * (max_m / np.max(m_list)) m_list = torch.cuda.FloatTensor(m_list) self.m_list = m_list assert s > 0 self.s = s if weight is not None: weight = torch.FloatTensor(weight).cuda() self.weight = weight self.cls_num_list = cls_num_list def forward(self, x, target): index = torch.zeros_like(x, dtype=torch.uint8) index_float = index.type(torch.cuda.FloatTensor) batch_m = torch.matmul(self.m_list[None, :], index_float.transpose(1,0)) # 0,1 batch_m = batch_m.view((16, 1)) # size=(batch_size, 1) (-1,1) x_m = x - batch_m output = torch.where(index, x_m, x) if self.weight is not None: output = output * self.weight[None, :] target = torch.flatten(target) # 将 target 转换成 1D Tensor logit = output * self.s return F.cross_entropy(logit, target, weight=self.weight) 模型部分参数如下：# 设置全局参数 model_lr = 1e-5 BATCH_SIZE = 16 EPOCHS = 50 DEVICE = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu') use_amp = True use_dp = True classes = 7 resume = None CLIP_GRAD = 5.0 Best_ACC = 0 #记录最高得分 use_ema=True model_ema_decay=0.9998 start_epoch=1 seed=1 seed_everything(seed) # 数据增强 mixup mixup_fn = Mixup( mixup_alpha=0.8, cutmix_alpha=1.0, cutmix_minmax=None, prob=0.1, switch_prob=0.5, mode='batch', label_smoothing=0.1, num_classes=classes) 帮我用pytorch实现模型在模型训练中使用LDAM损失函数

2023-05-30 上传
super(MyModel, self).__init__() self.conv1 = nn.Conv2d(3, 64, 3, padding=1) self.bn1 = nn.BatchNorm2d(64) self.conv2 = nn.Conv2d(64, 128, 3, padding=1) self.bn2 = nn.BatchNorm2d(128) self.conv3 ...

LDAM损失函数pytorch代码如下：class LDAMLoss(nn.Module): def init(self, cls_num_list, max_m=0.5, weight=None, s=30): super(LDAMLoss, self).init() m_list = 1.0 / np.sqrt(np.sqrt(cls_num_list)) m_list = m_list * (max_m / np.max(m_list)) m_list = torch.cuda.FloatTensor(m_list) self.m_list = m_list assert s > 0 self.s = s if weight is not None: weight = torch.FloatTensor(weight).cuda() self.weight = weight self.cls_num_list = cls_num_list def forward(self, x, target): index = torch.zeros_like(x, dtype=torch.uint8) index_float = index.type(torch.cuda.FloatTensor) batch_m = torch.matmul(self.m_list[None, :], index_float.transpose(1,0)) # 0,1 batch_m = batch_m.view((16, 1)) # size=(batch_size, 1) (-1,1) x_m = x - batch_m output = torch.where(index, x_m, x) if self.weight is not None: output = output * self.weight[None, :] target = torch.flatten(target) # 将 target 转换成 1D Tensor logit = output * self.s return F.cross_entropy(logit, target, weight=self.weight) 模型部分参数如下：# 设置全局参数 model_lr = 1e-5 BATCH_SIZE = 16 EPOCHS = 50 DEVICE = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu') use_amp = True use_dp = True classes = 7 resume = None CLIP_GRAD = 5.0 Best_ACC = 0 #记录最高得分 use_ema=True model_ema_decay=0.9998 start_epoch=1 seed=1 seed_everything(seed) # 数据增强 mixup mixup_fn = Mixup( mixup_alpha=0.8, cutmix_alpha=1.0, cutmix_minmax=None, prob=0.1, switch_prob=0.5, mode='batch', label_smoothing=0.1, num_classes=classes) # 读取数据集 dataset_train = datasets.ImageFolder('/home/adminis/hpy/ConvNextV2_Demo/RAF-DB/RAF/train', transform=transform) dataset_test = datasets.ImageFolder("/home/adminis/hpy/ConvNextV2_Demo/RAF-DB/RAF/valid", transform=transform_test) 帮我用pytorch实现模型在模型训练中使用LDAM损失函数

2023-05-30 上传
super(LDAMLoss, self).__init__() m_list = 1.0 / np.sqrt(np.sqrt(cls_num_list)) m_list = m_list * (max_m / np.max(m_list)) m_list = torch.cuda.FloatTensor(m_list) self.m_list = m_list assert s > ...

import numpy import numpy as np import matplotlib.pyplot as plt import math import torch from torch import nn from torch.utils.data import DataLoader, Dataset import os os.environ['KMP_DUPLICATE_LIB_OK']='True' dataset = [] for data in np.arange(0, 3, .01): data = math.sin(data * math.pi) dataset.append(data) dataset = np.array(dataset) dataset = dataset.astype('float32') max_value = np.max(dataset) min_value = np.min(dataset) scalar = max_value - min_value print(scalar) dataset = list(map(lambda x: x / scalar, dataset)) def create_dataset(dataset, look_back=3): dataX, dataY = [], [] for i in range(len(dataset) - look_back): a = dataset[i:(i + look_back)] dataX.append(a) dataY.append(dataset[i + look_back]) return np.array(dataX), np.array(dataY) data_X, data_Y = create_dataset(dataset) train_X, train_Y = data_X[:int(0.8 * len(data_X))], data_Y[:int(0.8 * len(data_Y))] test_X, test_Y = data_Y[int(0.8 * len(data_X)):], data_Y[int(0.8 * len(data_Y)):] train_X = train_X.reshape(-1, 1, 3).astype('float32') train_Y = train_Y.reshape(-1, 1, 3).astype('float32') test_X = test_X.reshape(-1, 1, 3).astype('float32') train_X = torch.from_numpy(train_X) train_Y = torch.from_numpy(train_Y) test_X = torch.from_numpy(test_X) class RNN(nn.Module): def __init__(self, input_size, hidden_size, output_size=1, num_layer=2): super(RNN, self).__init__() self.input_size = input_size self.hidden_size = hidden_size self.output_size = output_size self.num_layer = num_layer self.rnn = nn.RNN(input_size, hidden_size, batch_first=True) self.linear = nn.Linear(hidden_size, output_size) def forward(self, x): out, h = self.rnn(x) out = self.linear(out[0]) return out net = RNN(3, 20) criterion = nn.MSELoss(reduction='mean') optimizer = torch.optim.Adam(net.parameters(), lr=1e-2) train_loss = [] test_loss = [] for e in range(1000): pred = net(train_X) loss = criterion(pred, train_Y) optimizer.zero_grad() # 反向传播 loss.backward() optimizer.step() if (e + 1) % 100 == 0: print('Epoch:{},loss:{:.10f}'.format(e + 1, loss.data.item())) train_loss.append(loss.item()) plt.plot(train_loss, label='train_loss') plt.legend() plt.show()请适当修改代码，并写出预测值和真实值的代码

2023-06-09 上传
super(RNN, self).__init__() self.input_size = input_size self.hidden_size = hidden_size self.output_size = output_size self.num_layer = num_layer self.rnn = nn.RNN(input_size, hidden_size, ...

class KNearestNeighbor(object): def __init__(self): pass def train(self, X, y): self.X_train = X self.y_train = y def predict(self, X, k=1): num_test = X.shape[0] num_train = self.X_train.shape[0] dists = np.zeros((num_test, num_train)) d1 = -2 * np.dot(X, self.X_train.T) d2 = np.sum(np.square(X), axis=1, keepdims=True) d3 = np.sum(np.square(self.X_train), axis=1) dist = np.sqrt(d1 + d2 + d3) y_pred = np.zeros(num_test) for i in range(num_test): dist_k_min = np.argsort(dist[i])[:k] y_kclose = self.y_train[dist_k_min] y_pred[i] = np.argmax(np.bincount(y_kclose.tolist())) return y_pred注释每一行代码

2023-05-24 上传
这是一个K最近邻分类器的Python实现，以下是每一行代码的注释： ... y_pred[i] = np.argmax(np.bincount(y_kclose.tolist())) # 对这k个训练数据的标签进行投票，选出最多的标签作为预测结果 return y_pred ```

class WorldEnv: def __init__(self): self.distance_threshold = 0.01 self.action_bound = 1 self.goal = None self.state = None self.path = [] self.success_rate = [] self.obstacles = [((2, 2), (3, 3)), ((0, 4), (3, 5)), ((4, 1), (5, 4))] self.obstacle_margin = 0.3 def reset(self): self.goal = np.array([5, 5]) self.state = np.array([1, 1], dtype=np.float64) self.start = np.array([1, 1]) self.count = 0 self.path = [self.state.tolist()] return np.hstack((self.state, self.goal)) def step(self, action): action = np.clip(action, -self.action_bound, self.action_bound) x = max(0, min(5, self.state[0] + action[0])) y = max(0, min(5, self.state[1] + action[1])) self.state = np.array([x, y]) self.count += 1 dis = np.sqrt(np.sum(np.square(self.state - self.goal))) reward = -1.0 if dis > self.distance_threshold else 0 if dis <= self.distance_threshold or self.count == 50: done = True else: done = False return np.hstack((self.state, self.goal)), reward, done 修改代码，让智能体如果下一步动作后距离障碍物的边界或地图边界小于0.3，或处于障碍物中，或动作序列超过50，奖励-1，结束动作序列，返回初始状态。如果智能体到达目标或距离目标小于0.01，奖励1，结束动作，返回初始状态

2023-07-10 上传
dx = max(0, max(x_min - pos[0], pos[0] - x_max)) dy = max(0, max(y_min - pos[1], pos[1] - y_max)) return np.sqrt(dx**2 + dy**2) def is_outside_boundary(self, pos): return pos[0] [0] > 5 or pos...

import numpy as np import matplotlib.pyplot as plt import math import torch from torch import nn import pdb from torch.autograd import Variable import os os.environ['KMP_DUPLICATE_LIB_OK']='True' dataset = [] for data in np.arange(0, 3, .01): data = math.sin(data * math.pi) dataset.append(data) dataset = np.array(dataset) dataset = dataset.astype('float32') max_value = np.max(dataset) min_value = np.min(dataset) scalar = max_value - min_value dataset = list(map(lambda x: x / scalar, dataset)) def create_dataset(dataset, look_back=3): dataX, dataY = [], [] for i in range(len(dataset) - look_back): a = dataset[i:(i + look_back)] dataX.append(a) dataY.append(dataset[i + look_back]) return np.array(dataX), np.array(dataY) data_X, data_Y = create_dataset(dataset) # 对训练集测试集划分,划分比例0.8 train_X, train_Y = data_X[:int(0.8 * len(data_X))], data_Y[:int(0.8 * len(data_Y))] test_X, test_Y = data_Y[int(0.8 * len(data_X)):], data_Y[int(0.8 * len(data_Y)):] train_X = train_X.reshape(-1, 1, 3).astype('float32') train_Y = train_Y.reshape(-1, 1, 3).astype('float32') test_X = test_X.reshape(-1, 1, 3).astype('float32') class RNN(nn.Module): def __init__(self, input_size, hidden_size, output_size=1, num_layer=2): super(RNN, self).__init__() self.input_size = input_size self.hidden_size = hidden_size self.output_size = output_size self.num_layer = num_layer self.rnn = nn.RNN(input_size, hidden_size, batch_first=True) self.linear = nn.Linear(hidden_size, output_size) def forward(self, x): # 补充forward函数 out, h = self.rnn(x) out = self.linear(out[0]) # print("output的形状", out.shape) return out net = RNN(3, 20) criterion = nn.MSELoss(reduction='mean') optimizer = torch.optim.Adam(net.parameters(), lr=1e-2) train_loss = [] test_loss = [] for e in range(1000): pred = net(train_X) loss = criterion(pred, train_Y) optimizer.zero_grad() # 反向传播 loss.backward() optimizer.step() if (e + 1) % 100 == 0: print('Epoch:{},loss:{:.10f}'.format(e + 1, loss.data.item())) train_loss.append(loss.item()) plt.plot(train_loss, label='train_loss') plt.legend() plt.show()画出预测值真实值图

2023-06-09 上传
抱歉，我作为一个语言模型，无法在这里画图。不过，你可以通过以下代码来画出预测值和真实值的图： ``` ...data_predict = train_predict.data.numpy() dataY_plot = data_Y.reshape(-1) data_predict_plot = data_...

pytorch部分代码如下：class LDAMLoss(nn.Module): def init(self, cls_num_list, max_m=0.5, weight=None, s=30): super(LDAMLoss, self).init() m_list = 1.0 / np.sqrt(np.sqrt(cls_num_list)) m_list = m_list * (max_m / np.max(m_list)) m_list = torch.cuda.FloatTensor(m_list) self.m_list = m_list assert s > 0 self.s = s if weight is not None: weight = torch.FloatTensor(weight).cuda() self.weight = weight self.cls_num_list = cls_num_list def forward(self, x, target): index = torch.zeros_like(x, dtype=torch.uint8) index_float = index.type(torch.cuda.FloatTensor) batch_m = torch.matmul(self.m_list[None, :], index_float.transpose(0,1)) batch_m = batch_m.view((-1, 1)) # size=(batch_size, 1) (-1,1) x_m = x - batch_m output = torch.where(index, x_m, x) if self.weight is not None: output = output * self.weight[None, :] logit = output * self.s return F.cross_entropy(logit, target, weight=self.weight) train_loader = torch.utils.data.DataLoader(dataset_train, batch_size=BATCH_SIZE, shuffle=True,drop_last=True) test_loader = torch.utils.data.DataLoader(dataset_test, batch_size=BATCH_SIZE, shuffle=True) cls_num_list = np.zeros(classes) for , label in train_loader.dataset: cls_num_list[label] += 1 criterion_train = LDAMLoss(cls_num_list=cls_num_list, max_m=0.5, s=30) criterion_val = LDAMLoss(cls_num_list=cls_num_list, max_m=0.5, s=30) mixup_fn = Mixup( mixup_alpha=0.8, cutmix_alpha=1.0, cutmix_minmax=None, prob=0.1, switch_prob=0.5, mode='batch', label_smoothing=0.1, num_classes=classes) for batch_idx, (data, target) in enumerate(train_loader): data, target = data.to(device, non_blocking=True), Variable(target).to(device,non_blocking=True) # 3、将数据输入mixup_fn生成mixup数据 samples, targets = mixup_fn(data, target) targets = torch.tensor(targets).to(torch.long) # 4、将上一步生成的数据输入model，输出预测结果，再计算loss output = model(samples) # 5、梯度清零（将loss关于weight的导数变成0） optimizer.zero_grad() # 6、若使用混合精度 if use_amp: with torch.cuda.amp.autocast(): # 开启混合精度 loss = torch.nan_to_num(criterion_train(output, targets)) # 计算loss scaler.scale(loss).backward() # 梯度放大 torch.nn.utils.clip_grad_norm(model.parameters(), CLIP_GRAD) # 梯度裁剪，防止梯度爆炸 scaler.step(optimizer) # 更新下一次迭代的scaler scaler.update() # 否则，直接反向传播求梯度 else: loss = criterion_train(output, targets) loss.backward() torch.nn.utils.clip_grad_norm_(model.parameters(), CLIP_GRAD) optimizer.step() 报错：RuntimeError: Expected index [112, 1] to be smaller than self [16, 7] apart from dimension 1

2023-05-29 上传
这个报错是因为在计算batch_m时，index_float的维度是反过来的，应该将index_...batch_m = torch.matmul(self.m_list[None, :], index_float.transpose(1,0)) ... ``` 你可以尝试修改后再运行看看是否还会出现报错。
JaniceLu
  • 粉丝: 98
  • 资源: 1万+
上传资源 快速赚钱

最新资源