def eval_accuracy(label, pred): return np.sum(label == pred)/len(label) def draw(xy_points, t_val, b_t): if len(xy_points) != len(t_val): return u_t_val = np.unique(t_val) # draw dots for i in range(len(xy_points)): if b_t: # test data ax.scatter(xy_points[i, 0], xy_points[i, 1], s=10, marker='*', c='c') else: # train data if t_val[i] == u_t_val[0]: ax.scatter(xy_points[i, 0], xy_points[i, 1], s=10, marker='^', c='b') elif t_val[i] == u_t_val[1]: ax.scatter(xy_points[i, 0], xy_points[i, 1], s=10, marker='v', c='g') else: ax.scatter(xy_points[i, 0], xy_points[i, 1], s=10, marker='d', c='k')，这段代码的含义是什么

SeHCAT_eval开源软件：计算全身SPECT保留值

资源摘要信息:"SeHCAT_eval是一款开源软件工具，专门用于分析和计算SeHCAT（75硒标记的氢化椰油酸钠）扫描图像的保留率。SeHCAT扫描是一种用于评估胆汁酸肠肝循环的核医学检查方法，常用于诊断与胆汁酸吸收相关的...

arit_eval开源项目：实现抗溢出算术表达式评估

资源摘要信息:"arit_eval是一个开源的算术表达式评估器，其设计的主要特点是具有抗溢出资源。算术表达式评估器通常用于编程语言中对算术表达式进行解析和计算，它能够处理各种基本和复杂的数学运算，如加减乘除、...

# evaluate model acc_train = eval_accuracy(label=t_train, pred=pred_train) acc_test = eval_accuracy(label=t_test, pred=pred_test) print("train accuracy: {:.1f}%".format(acc_train * 100)) print("test accuracy: {:.1f}%".format(acc_test * 100)) def init_canvas(): x_min = min(np.min(data_train[:, 0]), np.min(data_test[:, 0])) y_min = min(np.min(data_train[:, 1]), np.min(data_test[:, 1])) x_max = max(np.max(data_train[:, 0]), np.max(data_test[:, 0])) y_max = max(np.max(data_train[:, 1]), np.max(data_test[:, 1])) fig, ax = plt.subplots(figsize=(8, 5)) plt.title(title, fontsize=10) plt.ylabel('Y') plt.xlabel('X') ax.set_xlim(x_min - 1, x_max + 1) ax.set_ylim(y_min - 1, y_max + 1) return fig, ax, x_min, x_max, y_min, y_max fig, ax, x_min, x_max, y_min, y_max = init_canvas() draw(x1_x2_train, t_train, b_t=False) #draw(x1_x2_test, t_test, b_t=True)，这段代码的含义是什么

1. 调用eval_accuracy函数计算并输出模型在训练集和测试集上的准确率。 2. 定义init_canvas函数，用于初始化绘图画布。该函数根据训练集和测试集的数据点的横纵坐标范围，确定画布的横纵坐标轴范围，并返回画布...

def val(dataloader, model, loss_fn): size = len(dataloader.dataset) num_batches = len(dataloader) model.eval() val_loss, correct = 0, 0 with torch.no_grad(): for X, y in dataloader: X, y = X.to(device), y.to(device) pred = model(X) val_loss += loss_fn(pred, y).item() correct += (pred.argmax(1) == y).type(torch.float).sum().item() val_loss /= num_batches correct /= size print(f"val Error: \n Accuracy: {(100*correct):>0.1f}%, Avg loss: {val_loss:>8f} \n

这段代码是用于在验证集上评估模型性能的函数。让我来解释一下它的功能： - dataloader：数据加载器，用于迭代验证集数据。 - model：模型，即你构建的卷积神经网络模型。 - loss_fn：损失函数，用于计算预测...

为以下代码添加注释def test(dataloader, model, loss_fn): size = len(dataloader.dataset) num_batches = len(dataloader) model.eval() test_loss, correct = 0, 0 with torch.no_grad(): for X, y in dataloader: X, y = X.to(device), y.to(device) pred = model(X) test_loss += loss_fn(pred, y).item() correct += (pred.argmax(1) == y).type(torch.float).sum().item() test_loss /= num_batches correct /= size print(f"Test Error: \n Accuracy: {(100*correct):>0.1f}%, Avg loss: {test_loss:>8f} \n")

correct += (pred.argmax(1) == y).type(torch.float).sum().item() # 计算平均测试损失和正确率 test_loss /= num_batches correct /= size # 输出测试结果 print(f"Test Error: \n Accuracy: {(100*correct)...

def test(g, model, criterion, test_loader): model.eval() with torch.no_grad(): for input_nodes, output_nodes, blocks in test_loader: blocks = [b.to(torch.device('cuda')) for b in blocks] input_features = blocks[0].srcdata['feat'] output_labels = blocks[-1].dstdata['label'] output_labels = output_labels.to(torch.device('cuda')) # forward pred = model(blocks, input_features) loss = criterion(pred, output_labels) # accuracy _, indices = torch.max(pred, dim=1) correct = torch.sum(indices == output_labels) accuracy = correct.item() / len(output_labels) return loss.item(), accuracy解释一下

这个函数首先将模型设为评估模式（model.eval()），然后使用 with torch.no_grad() 语句块来禁用梯度计算，以提高计算效率。接着，对于每个批次的测试数据，将数据移动到 GPU 上，并从第一个块（input_nodes）中获取...

def train(dataloader, model, loss_fn, optimizer): size = len(dataloader.dataset) model.train() LossList = [] for batch, (X, y) in enumerate(dataloader): X, y = X.to(device), y.to(device) y=y.long() # Compute prediction error pred = model(X) loss = loss_fn(pred, y) # Backpropagation optimizer.zero_grad() loss.backward() optimizer.step() if batch % 50 == 0: loss, current = loss.item(), (batch + 1) * len(X) print(f"loss: {loss:>7f} [{current:>5d}/{size:>5d}]") LossList.append(loss) return Losslist def test(dataloader, model, loss_fn): size = len(dataloader.dataset) num_batches = len(dataloader) model.eval() LossList = [] AccList = [] test_loss, correct = 0, 0 with torch.no_grad(): for X, y in dataloader: X, y = X.to(device), y.to(device) y=y.long() pred = model(X) test_loss += loss_fn(pred, y).item() correct += (pred.argmax(1) == y).type(torch.float).sum().item() test_loss /= num_batches correct /= size LossList.append(test_loss) AccList.append(correct) print(f"Test Error: \n Accuracy: {(100*correct):>0.1f}%, Avg loss: {test_loss:>8f} \n") return LossList,acclist报错显示lostlist未定义

correct += (pred.argmax(1) == y).type(torch.float).sum().item() test_loss /= num_batches correct /= size losslist.append(test_loss) # 将 test_loss 添加到 losslist 中 acclist.append(correct) # 将 ...

def train(dataloader, model, loss_fn, optimizer): size = len(dataloader.dataset) model.train() for batch, (X, y) in enumerate(dataloader): X, y = X.to(device), y.to(device) y=y.long() # Compute prediction error pred = model(X) loss = loss_fn(pred, y) # Backpropagation optimizer.zero_grad() loss.backward() optimizer.step() if batch % 50 == 0: loss, current = loss.item(), (batch + 1) * len(X) print(f"loss: {loss:>7f} [{current:>5d}/{size:>5d}]") return Losslist def test(dataloader, model, loss_fn): size = len(dataloader.dataset) num_batches = len(dataloader) model.eval() test_loss, correct = 0, 0 with torch.no_grad(): for X, y in dataloader: X, y = X.to(device), y.to(device) y=y.long() pred = model(X) test_loss += loss_fn(pred, y).item() correct += (pred.argmax(1) == y).type(torch.float).sum().item() test_loss /= num_batches correct /= size print(f"Test Error: \n Accuracy: {(100*correct):>0.1f}%, Avg loss: {test_loss:>8f} \n") return LossList,acclist

这段代码是一个简单的 PyTorch 训练和测试循环。训练循环使用给定的数据加载器、模型、损失函数和优化器来训练模型；测试循环使用给定的数据加载器、模型和损失函数来评估模型在测试集上的性能。...

def train(self, data_dict, **kwargs): input_data = data_dict['input_data'] label = data_dict['label'] self.model_container.set_train(['model']) if self.use_cuda: input_data, label = input_data.to(self.devices[0]), label.to(self.devices[0]) self.optimizer.zero_grad() pred = self.model_container.infer('model', input_data, False) loss = self.loss_func(pred, label) acc_1, acc_5 = accuracy(pred.cpu(), label.cpu(), topk=(1, min(5, pred.shape[-1]))) loss.backward() self.optimizer.step() if self.debug: if self.debug_input: self.inspect_input(input_data) if self.debug_labels: self.inspect_labels(pred, label, acc_1) return loss.item(), acc_1, acc_5这个函数每局是什么意思

在进行前向传播时，需要保证模型处于eval模式，这是由model_container控制的。计算损失函数使用的是loss_func，损失函数的计算结果是一个标量。计算准确率使用的是accuracy函数，其中top1准确率表示预测结果中前1个...

def Land_cover_pred_plot(array_folder,raster_file, reference_file,ML_algo, plot = False): df_train , train_array = get_data_eval(array_folder,raster_file, reference_file) df_train = df_train.dropna() print(df_train) train_array = np.array(train_array, dtype=object) tile_df = pd.DataFrame() for i, array in enumerate(train_array[0]): # print(train_array[i], train_array_name[i]) tile_df[train_array[1][i]] = np.nan_to_num(array.ravel(), copy=False) # print(train_array[0][i], train_array[1][i]) X_train, X_test, y_train, y_test = train_test_split(df_train.drop('type' , axis = 1),df_train['type'],test_size = 0.1) print(X_train) ML_algo.fit(X_train,y_train) test_pred = ML_algo.predict(X_test) confusion_mat = confusion_matrix(y_test,test_pred) classification_repo = classification_report(y_test, test_pred) test_acc = accuracy_score(y_test, test_pred) print("Confusion Matri : \n", confusion_mat) print("Classification Report : \n", classification_repo) print("Accuracy on Test : ", test_acc) pred_array = ML_algo.predict(tile_df) mask_array = np.reshape(pred_array, train_array[0][0].shape) class_sum = [] for i,j in enumerate(df_train['type'].unique()): sum = (mask_array == j).sum() class_sum.append([j,sum]) print(class_sum) print(mask_array) if plot == True: arr_f = np.array(mask_array, dtype = float) arr_f = np.rot90(arr_f, axes=(-2,-1)) arr_f = np.flip(arr_f,0) plt.imshow(arr_f) plt.colorbar() return mask_array

函数调用 get_data_eval 函数来获取训练数据，并使用 train_test_split 函数将其分成训练集和测试集。然后，使用机器学习算法来拟合训练数据，预测测试数据，并计算准确度、混淆矩阵和分类报告。最后，使用训练后的...

test_loss = 0.0 class_correct = list(0. for i in range(2)) class_total = list(0. for i in range(2)) model.eval() # iterate over test data for data, target in test_loader: # move tensors to GPU if CUDA is available if train_on_gpu: data, target = data.cuda(), target.cuda() # forward pass: compute predicted outputs by passing inputs to the model output = model(data) # calculate the batch loss loss = criterion(output, target) # update test loss test_loss += loss.item()*data.size(0) # convert output probabilities to predicted class _, pred = torch.max(output, 1) # compare predictions to true label correct_tensor = pred.eq(target.data.view_as(pred)) correct = np.squeeze(correct_tensor.numpy()) if not train_on_gpu else np.squeeze(correct_tensor.cpu().numpy()) # calculate test accuracy for each object class for i in range(batch_size): label = target.data[i] class_correct[label] += correct[i].item() class_total[label] += 1 # average test loss test_loss = test_loss/len(test_loader.dataset) print('Test Loss: {:.6f}\n'.format(test_loss))哪里有问题

2. model.eval() 用于将模型设置为评估模式，这会影响到一些层的行为，例如 BatchNorm 和 Dropout。 3. 确保 criterion 是正确的损失函数。 4. 如果你想计算每个类别的准确率，确保你的模型输出维度与类别...

帮我检查以下代码是否有错误：final_model = XGBClassifier(random_state=42) eval_set = [(X_train_scaled, y_train), (X_test_scaled, y_test)] final_model.fit(X_train_scaled, y_train,eval_set=eval_set) model.eval() pred = final_model.predict(X_test_scaled) cm_model = confusion_matrix(y_test, pred) print("Accuracy: %.4f " % accuracy_score(y_test, pred)) print("Roc_auc score: %.4f \n" % roc_auc_score(y_test, pred)) print(classification_report(y_test, pred)) plot_cm(cm_model)

在这行代码中：model.eval()，model应该被替换成 final_model，因为 model 这个变量没有被定义过。所以这行代码应该修改为： final_model.eval() 其他代码看起来没有问题，但需要确保在导入库和...

if (epoch + 1) % val_interval == 0: model.eval() with torch.no_grad(): y_pred = torch.tensor([], dtype=torch.float32, device=device) y = torch.tensor([], dtype=torch.long, device=device) for val_data in val_loader: val_images, val_labels = ( val_data[0].to(device), val_data[1].to(device), ) y_pred = torch.cat([y_pred, model(val_images)], dim=0) y = torch.cat([y, val_labels], dim=0) y_onehot = [y_trans(i) for i in decollate_batch(y, detach=False)] y_pred_act = [y_pred_trans(i) for i in decollate_batch(y_pred)] auc_metric(y_pred_act, y_onehot) result = auc_metric.aggregate() auc_metric.reset() del y_pred_act, y_onehot metric_values.append(result) acc_value = torch.eq(y_pred.argmax(dim=1), y) acc_metric = acc_value.sum().item() / len(acc_value) if result > best_metric: best_metric = result best_metric_epoch = epoch + 1 torch.save(model.state_dict(), os.path.join(root_dir, "best_metric_model.pth")) print("saved new best metric model") print( f"current epoch: {epoch + 1} current AUC: {result:.4f}" f" current accuracy: {acc_metric:.4f}" f" best AUC: {best_metric:.4f}" f" at epoch: {best_metric_epoch}" )

在每个val_interval的倍数的epoch结束后，模型会进入评估模式(model.eval())，然后用验证集(val_loader)进行验证。首先，创建了两个空的tensor，y_pred和y，用于存储预测结果和真实标签。然后，对于每个val_data...

# 加载模型 my_model = myModel() my_model.eval() params_file_path = './mnist_predict_model.pdparams' param_dict = paddle.load(params_file_path) my_model.load_dict(param_dict) test_loader = load_data('valid') results=[] for batch_id, data in enumerate(test_loader()): # 准备数据 images, labels = data images = paddle.to_tensor(images) labels = paddle.to_tensor(labels) # 预测 predicts = my_model(images) acc = fluid.layers.accuracy(input=predicts, label=labels) for pred in predicts: results.append(np.argmax(pred)) #转化测试结果，输出是每种类别的概率，取概率最大的类别作为该图片的预测结果

使用fluid.layers.accuracy函数计算预测准确率，并将每张图片的预测结果保存到results列表中。 4. 输出预测结果：将模型的预测结果转换为最终的分类标签，并输出预测结果。需要注意的是，这个模型的预测结果...

import pandas as pd from sklearn import metrics from sklearn.model_selection import train_test_split import xgboost as xgb import matplotlib.pyplot as plt import openpyxl # 导入数据集 df = pd.read_csv("/Users/mengzihan/Desktop/正式有血糖聚类前.csv") data=df.iloc[:,:35] target=df.iloc[:,-1] # 切分训练集和测试集 train_x, test_x, train_y, test_y = train_test_split(data,target,test_size=0.2,random_state=7) # xgboost模型初始化设置 dtrain=xgb.DMatrix(train_x,label=train_y) dtest=xgb.DMatrix(test_x) watchlist = [(dtrain,'train')] # booster: params={'booster':'gbtree', 'objective': 'binary:logistic', 'eval_metric': 'auc', 'max_depth':12, 'lambda':10, 'subsample':0.75, 'colsample_bytree':0.75, 'min_child_weight':2, 'eta': 0.025, 'seed':0, 'nthread':8, 'gamma':0.15, 'learning_rate' : 0.01} # 建模与预测：50棵树 bst=xgb.train(params,dtrain,num_boost_round=50,evals=watchlist) ypred=bst.predict(dtest) # 设置阈值、评价指标 y_pred = (ypred >= 0.5)*1 print ('Precesion: %.4f' %metrics.precision_score(test_y,y_pred)) print ('Recall: %.4f' % metrics.recall_score(test_y,y_pred)) print ('F1-score: %.4f' %metrics.f1_score(test_y,y_pred)) print ('Accuracy: %.4f' % metrics.accuracy_score(test_y,y_pred)) print ('AUC: %.4f' % metrics.roc_auc_score(test_y,ypred)) ypred = bst.predict(dtest) print("测试集每个样本的得分\n",ypred) ypred_leaf = bst.predict(dtest, pred_leaf=True) print("测试集每棵树所属的节点数\n",ypred_leaf) ypred_contribs = bst.predict(dtest, pred_contribs=True) print("特征的重要性\n",ypred_contribs ) xgb.plot_importance(bst,height=0.8,title='影响糖尿病的重要特征', ylabel='特征') plt.rc('font', family='Arial Unicode MS', size=14) plt.show()

这段代码是使用XGBoost进行二分类任务的建模和预测，并输出了一些评价指标和特征重要性。下面是对代码的解释： 1. 导入必要的库：pandas用于数据处理，sklearn中的metrics模块用于评价指标，train_test_...

import pandas as pd from sklearn import metrics from sklearn.model_selection import train_test_split import xgboost as xgb import matplotlib.pyplot as plt # 导入数据集 df = pd.read_csv("./data/diabetes.csv") data=df.iloc[:,:8] target=df.iloc[:,-1] # 切分训练集和测试集 train_x, test_x, train_y, test_y = train_test_split(data,target,test_size=0.2,random_state=7) # xgboost模型初始化设置 dtrain=xgb.DMatrix(train_x,label=train_y) dtest=xgb.DMatrix(test_x) watchlist = [(dtrain,'train')] # booster: params={'booster':'gbtree', 'objective': 'binary:logistic', 'eval_metric': 'auc', 'max_depth':5, 'lambda':10, 'subsample':0.75, 'colsample_bytree':0.75, 'min_child_weight':2, 'eta': 0.025, 'seed':0, 'nthread':8, 'gamma':0.15, 'learning_rate' : 0.01} # 建模与预测：50棵树 bst=xgb.train(params,dtrain,num_boost_round=50,evals=watchlist) ypred=bst.predict(dtest) # 设置阈值、评价指标 y_pred = (ypred >= 0.5)*1 print ('Precesion: %.4f' %metrics.precision_score(test_y,y_pred)) print ('Recall: %.4f' % metrics.recall_score(test_y,y_pred)) print ('F1-score: %.4f' %metrics.f1_score(test_y,y_pred)) print ('Accuracy: %.4f' % metrics.accuracy_score(test_y,y_pred)) print ('AUC: %.4f' % metrics.roc_auc_score(test_y,ypred)) ypred = bst.predict(dtest) print("测试集每个样本的得分\n",ypred) ypred_leaf = bst.predict(dtest, pred_leaf=True) print("测试集每棵树所属的节点数\n",ypred_leaf) ypred_contribs = bst.predict(dtest, pred_contribs=True) print("特征的重要性\n",ypred_contribs ) xgb.plot_importance(bst,height=0.8,title='影响糖尿病的重要特征', ylabel='特征') plt.rc('font', family='Arial Unicode MS', size=14) plt.show()请问怎样设置这个代码的参数才合理，并且帮我分析一下哪里出了问题

请确保这些指标的计算正确，并且测试集的真实标签(test_y)与预测结果(y_pred)的格式一致。根据您提供的代码片段，我无法确定具体出了哪些问题，因为缺少了部分代码。如果您可以提供完整的代码和数据集，我将能够更...

WARNING : No fit_metrics_aggregation_fn provided WARNING : No evaluate_metrics_aggregation_fn provided

这两个警告信息通常出现在机器学习模型训练或评估的过程中，特别是在使用某些... return accuracy_score(y_true, y_pred > threshold) # 示例：二分类问题 eval_metric = make_scorer(my_evaluate_metrics) # ...

我希望你写一个基于MINIST数据集的神经网络，使用pytorch，实现手写数字分类。我希望有完整的代码结构，并输出测试结果。从if name == 'main':开始不要解释，给出代码

correct += pred.eq(target.view_as(pred)).sum().item() test_loss /= len(test_loader.dataset) print('\nTest set: Average loss: {:.4f}, Accuracy: {}/{} ({:.0f}%)\n'.format( test_loss, correct, len...

baseline2=LogisticRegression() baseline2.fit(X_train,y_train) print(f'Train : { baseline2.score(X_train,y_train)}') model_eval(baseline2,X_test,y_test, bta = 1)输出结果并解释

def model_eval(model, X_test, y_test, beta=1): y_pred = model.predict(X_test) accuracy = model.score(X_test, y_test) precision = precision_score(y_test, y_pred) recall = recall_score(y_test, y_...

相关推荐

SeHCAT_eval开源软件：计算全身SPECT保留值

arit_eval开源项目：实现抗溢出算术表达式评估

WARNING : No fit_metrics_aggregation_fn provided WARNING : No evaluate_metrics_aggregation_fn provided

我希望你写一个基于MINIST数据集的神经网络，使用pytorch，实现手写数字分类。我希望有完整的代码结构，并输出测试结果。从if __name__ == '__main__':开始不要解释，给出代码

baseline2=LogisticRegression() baseline2.fit(X_train,y_train) print(f'Train : { baseline2.score(X_train,y_train)}') model_eval(baseline2,X_test,y_test, bta = 1)输出结果并解释

最新推荐

Windows平台下的Fastboot工具使用指南

管理建模和仿真的文件

DLMS规约深度剖析：从基础到电力通信标准的全面掌握

修改代码，使其正确运行

Python机器学习基础入门与项目实践

"互动学习：行动中的多样性与论文攻读经历"

【Shell脚本进阶】：wc命令行数统计的高级用法及解决方案

python编写一个程序，使得根据输入的起点和终点坐标值计算出坐标方位角

Achilles-2 原始压缩包内容解密

关系数据表示学习

我希望你写一个基于MINIST数据集的神经网络，使用pytorch，实现手写数字分类。我希望有完整的代码结构，并输出测试结果。从if name == 'main':开始不要解释，给出代码