Python中train_test-plot是干嘛用的

tensorflow_Resnet_train_test:用于在自己的数据集上训练不同体系结构（DenseNet，ResNet，AlexNet，GoogLeNet，VGG，NiN）的代码+多GPU支持+批处理和单个图像测试支持

tensorflow_Resnet_train_test 用于在自己的数据集上训练不同体系结构（DenseNet，ResNet，AlexNet，GoogLeNet，VGG，NiN）的代码+多GPU支持+批处理和单个图像测试支持该存储库提供了一种易于使用的方法，用于在您自己的数据集上训练和测试不同的知名深度学习架构。该代码直接从磁盘加载图像。此外，还支持多GPU和传输学习，您也可以选择批量或单次测试图像。基于存储库：＃用法示例：训练：准备训练数据列表：python train_val_datalist_creater.py 培训或转移学习：python train.py 测试： python eval.py 或分批测试：准备测试数据清单： python train_val_datalist_creater.py --create_data val 批量

绘制train+test的acc和loss，使用matplotlib

PyPI 官网下载 | train_test_plot-1.2.1-py3-none-any.whl

资源来自pypi官网，解压后可用。资源全名：train_test_plot-1.2.1-py3-none-any.whl

import pandas as pd import numpy as np import matplotlib.pyplot as plt import tensorflow as tf from tensorflow.keras.models import Sequential from tensorflow.keras.layers import LSTM, Dense data = pd.read_csv('车辆：274序：4结果数据.csv') x = data[['车头间距', '原车道前车速度']].values y = data['本车速度'].values train_size = int(len(x) * 0.7) test_size = len(x) - train_size x_train, x_test = x[0:train_size,:], x[train_size:len(x),:] y_train, y_test = y[0:train_size], y[train_size:len(y)] from sklearn.preprocessing import MinMaxScaler scaler = MinMaxScaler(feature_range=(0, 1)) x_train = scaler.fit_transform(x_train) x_test = scaler.transform(x_test) model = Sequential() model.add(LSTM(50, input_shape=(2, 1))) model.add(Dense(1)) model.compile(loss='mean_squared_error', optimizer='adam') history = model.fit(x_train.reshape(-1, 2, 1), y_train, epochs=100, batch_size=32, validation_data=(x_test.reshape(-1, 2, 1), y_test)) plt.plot(history.history['loss']) plt.plot(history.history['val_loss']) plt.title('Model loss') plt.ylabel('Loss') plt.xlabel('Epoch') plt.legend(['Train', 'Test'], loc='upper right') plt.show() train_predict = model.predict(x_train.reshape(-1, 2, 1)) test_predict = model.predict(x_test.reshape(-1, 2, 1)) train_predict = scaler.inverse_transform(train_predict) train_predict = train_predict.reshape(-1, 1) y_train = scaler.inverse_transform([y_train]) test_predict = scaler.inverse_transform(test_predict) y_test = scaler.inverse_transform([y_test]) plt.plot(y_train[0], label='train') plt.plot(train_predict[:,0], label='train predict') plt.plot(y_test[0], label='test') plt.plot(test_predict[:,0], label='test predict') plt.legend() plt.show()报错Traceback (most recent call last): File "C:\Users\马斌\Desktop\NGSIM_data_processing\80s\lstmtest.py", line 42, in <module> train_predict = scaler.inverse_transform(train_predict) File "D:\python\python3.9.5\pythonProject\venv\lib\site-packages\sklearn\preprocessing\_data.py", line 541, in inverse_transform X -= self.min_ ValueError: non-broadcastable output operand with shape (611,1) doesn't match the broadcast shape (611,2)

这个错误提示是因为在使用 scaler.inverse_transform() 函数时，输入的 train_predict 和 y_train 的维度不匹配，导致无法进行运算。具体来说，train_predict 是一个形状为 (611, 1) 的二维数组，而 y_...

修改和补充下列代码得到十折交叉验证的平均auc值和平均aoc曲线，平均分类报告以及平均混淆矩阵 min_max_scaler = MinMaxScaler() X_train1, X_test1 = x[train_id], x[test_id] y_train1, y_test1 = y[train_id], y[test_id] # apply the same scaler to both sets of data X_train1 = min_max_scaler.fit_transform(X_train1) X_test1 = min_max_scaler.transform(X_test1) X_train1 = np.array(X_train1) X_test1 = np.array(X_test1) config = get_config() tree = gcForest(config) tree.fit(X_train1, y_train1) y_pred11 = tree.predict(X_test1) y_pred1.append(y_pred11 X_train.append(X_train1) X_test.append(X_test1) y_test.append(y_test1) y_train.append(y_train1) X_train_fuzzy1, X_test_fuzzy1 = X_fuzzy[train_id], X_fuzzy[test_id] y_train_fuzzy1, y_test_fuzzy1 = y_sampled[train_id], y_sampled[test_id] X_train_fuzzy1 = min_max_scaler.fit_transform(X_train_fuzzy1) X_test_fuzzy1 = min_max_scaler.transform(X_test_fuzzy1) X_train_fuzzy1 = np.array(X_train_fuzzy1) X_test_fuzzy1 = np.array(X_test_fuzzy1) config = get_config() tree = gcForest(config) tree.fit(X_train_fuzzy1, y_train_fuzzy1) y_predd = tree.predict(X_test_fuzzy1) y_pred.append(y_predd) X_test_fuzzy.append(X_test_fuzzy1) y_test_fuzzy.append(y_test_fuzzy1)y_pred = to_categorical(np.concatenate(y_pred), num_classes=3) y_pred1 = to_categorical(np.concatenate(y_pred1), num_classes=3) y_test = to_categorical(np.concatenate(y_test), num_classes=3) y_test_fuzzy = to_categorical(np.concatenate(y_test_fuzzy), num_classes=3) print(y_pred.shape) print(y_pred1.shape) print(y_test.shape) print(y_test_fuzzy.shape) # 深度森林 report1 = classification_report(y_test, y_prprint("DF",report1) report = classification_report(y_test_fuzzy, y_pred) print("DF-F",report) mse = mean_squared_error(y_test, y_pred1) rmse = math.sqrt(mse) print('深度森林RMSE:', rmse) print('深度森林Accuracy:', accuracy_score(y_test, y_pred1)) mse = mean_squared_error(y_test_fuzzy, y_pred) rmse = math.sqrt(mse) print('F深度森林RMSE:', rmse) print('F深度森林Accuracy:', accuracy_score(y_test_fuzzy, y_pred)) mse = mean_squared_error(y_test, y_pred) rmse = math.sqrt(mse) print('F?深度森林RMSE:', rmse) print('F?深度森林Accuracy:', accuracy_score(y_test, y_pred))

X_train, X_test, y_train, y_test = [], [], [], [] X_train_fuzzy, X_test_fuzzy, y_train_fuzzy, y_test_fuzzy = [], [], [], [] y_pred, y_pred1 = [], [] y_pred_proba, y_pred_proba1 = [], [] config = get_...

def evaluate(ys, ys_pred): """评估模型。""" std = np.sqrt(np.mean(np.abs(ys - ys_pred) ** 2)) return std # 程序主入口（建议不要改动以下函数的接口） if name == 'main': train_file = 'train.txt' test_file = 'test.txt' # 载入数据 x_train, y_train = load_data(train_file) x_test, y_test = load_data(test_file) print(x_train.shape) print(x_test.shape) # 使用线性回归训练模型，返回一个函数f()使得y = f(x) f = main(x_train, y_train) y_train_pred = f(x_train) std = evaluate(y_train, y_train_pred) print('训练集预测值与真实值的标准差：{:.1f}'.format(std)) # 计算预测的输出值 y_test_pred = f(x_test) # 使用测试集评估模型 std = evaluate(y_test, y_test_pred) print('预测值与真实值的标准差：{:.1f}'.format(std)) #显示结果 plt.plot(x_train, y_train, 'ro', markersize=3) # plt.plot(x_test, y_test, 'k') plt.plot(x_test, y_test_pred, 'k') plt.xlabel('x') plt.ylabel('y') plt.title('Linear Regression') plt.legend(['train', 'test', 'pred']) plt.show() 优化上述代码，并在jupyter上可以运行，运行出结果

plt.plot(x_train, y_train, 'ro', markersize=3) plt.plot(x_test, y_test, 'k') plt.plot(x_test, y_test_pred, 'k') plt.xlabel('x') plt.ylabel('y') plt.title('Linear Regression') plt.legend(['train...

def train_and_pred(train_features, test_features, train_labels, test_data, num_epochs, lr, weight_decay, batch_size): model=linreg train_ls, _ ,theta= train(model, train_features, train_labels, None, None, #None, None表示是没有验证集，只做训练，得到模型net num_epochs, lr, weight_decay, batch_size) plot(np.arange(1, num_epochs + 1), train_ls, xlabel='epoch', ylabel='log rmse', xlim=[1, num_epochs], yscale='log') print(f'训练log rmse：{float(train_ls[-1]):f}') preds = model(test_features,theta) # 将其重新格式化以导出到Kaggle test_data['SalePrice'] = pd.Series(preds.reshape(1, -1)[0]) submission = pd.concat([test_data['Id'], test_data['SalePrice']], axis=1) submission.to_csv('submission.csv', index=False)帮我写个注释

def train_and_pred(train_features, test_features, train_labels, test_data, num_epochs, lr, weight_decay, batch_size): # 定义模型 model = linreg # 训练模型并得到训练误差、模型参数 train_ls, _, ...

import matplotlib.pyplot as plt import tushare as ts import pandas as pd import numpy as np from hmmlearn import hmm import sklearn from sklearn.model_selection import train_test_split df=ts.get_hist_data('600519',start='2019-01-01',end='2021-03-31') #让时间顺序从过去到现在 df=df.iloc[::-1] #选择收盘价作为预测目标 #将close列提取，并按行数由函数自动计算、列数为1转换为二维数组 y=df['close'].values.reshape(-1, 1) #数据标准化处理 y=(y-np.mean(y))/np.std(y) #拆分数据集：确定训练数据集和测试数据集 train_data,test_data=train_test_split(y,test_size=0.3,random_state=42) #训练一个高斯分布的隐马尔科夫模型 #状态空间数目设置 n_state=2 HMMmodel=hmm.GaussianHMM(n_components=n_state,n_iter=100) HMMmodel.fit(train_data) #在测试集上进行预测 #计算RMSE #在马尔可夫模型中，我们使用decode方法对模型进行预测，返回的是最可能的隐藏状态序列，也就是每个时间步的状态值；而在隐马尔可夫模型中，我们使用predict方法对模型进行预测，返回的是最可能的观测序列，也就是在给定模型和观测条件下，最可能的观测序列。 pred=HMMmodel.decode() rmse=np.sqrt(((test_data-pred)**2).mean()) #可视化训练数据、测试数据和模型预测结果 plt.plot(y,label='Acutal') plt.plot(range(len(train_data), len(train_data)+len(test_data)), pred, label='Predicted') plt.legend() plt.show()报错上面的信息

这段代码中出现了以下几个问题： 1. 在导入 tushare、pandas、numpy 和 sklearn 库时...plt.plot(range(len(train_data), len(train_data) + len(test_data)), pred, label='Predicted') plt.legend() plt.show()

将下列代码转换为matlab格式： from sklearn.model_selection import train_test_split train_x, test_x, train_y, test_y = train_test_split(np.array(data.iloc[:, [3,4,5,6,7,9,10,11,12,13,14,15]]), np.array(data.iloc[:, [5]]), test_size = 0.3) import xgboost as xgb from xgboost import plot_importance model = xgb.XGBRegressor(silent = 0, learning_rate = 0.05, eta = 0.1, gamma = 0.25, max_depth = 24, reg_lambda = 2, reg_alpha = 1, n_estimators = 300, seed = 999, objective ='reg:squarederror') model.fit(train_x, train_y, eval_metric = "rmse", eval_set = [(train_x, train_y), (test_x, test_y)], verbose = True)

以下是将给定的 Python 代码转换为 MATLAB 代码的示例： matlab % 加载数据 data = readtable('data.csv'); train_x = table2array(data(:, [4,5,6,7,8,10,11,12,13,14,15,16])); train_y = table2array(data(:,...

import matplotlib.pyplot as plt train_losses, train_accs, test_losses, test_accs = [], [], [], [] for epoch in range(100): train_loss, train_acc = train(model, train_loader, criterion, optimizer) test_loss, test_acc = test(model, test_loader, criterion) train_losses.append(train_loss) train_accs.append(train_acc) test_losses.append(test_loss) test_accs.append(test_acc) print('Epoch: {} Train Loss: {:.4f} Train Acc: {:.4f} Test Loss: {:.4f} Test Acc: {:.4f}'.format( epoch, train_loss, train_acc, test_loss, test_acc)) # 绘制损失函数曲线 plt.plot(train_losses, label='Train Loss') plt.plot(test_losses, label='Test Loss') plt.legend() plt.show() # 绘制准确率曲线 plt.plot(train_accs, label='Train Acc') plt.plot(test_accs, label='Test Acc') plt.legend() plt.show() 图像纵坐标设置为0~1

plt.plot(train_losses, label='Train Loss') plt.plot(test_losses, label='Test Loss') plt.ylim([0, 1]) # 设置y轴范围为0~1 plt.legend() plt.show() # 绘制准确率曲线 plt.plot(train_accs, label='Train Acc'...

from sklearn.datasets import load_wine from sklearn.model_selection import train_test_split from sklearn.tree import DecisionTreeClassifier # 加载葡萄酒数据集 wine = load_wine() # 划分训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(wine.data, wine.target, test_size=0.3, random_state=42) # 初始化决策树模型 clf = DecisionTreeClassifier() # 训练模型并预测测试集 clf.fit(X_train, y_train) y_pred = clf.predict(X_test) # 输出准确率 print("7:3的准确率：", clf.score(X_test, y_test)) # 重新划分训练集和测试集，比例为3:1 X_train, X_test, y_train, y_test = train_test_split(wine.data, wine.target, test_size=0.25, random_state=42) # 训练模型并预测测试集 clf.fit(X_train, y_train) y_pred1 = clf.predict(X_test) # 输出准确率 print("3:1的准确率：", clf.score(X_test, y_test)) # 重新划分训练集和测试集，比例为4:1 X_train, X_test, y_train, y_test = train_test_split(wine.data, wine.target, test_size=0.2, random_state=42) # 训练模型并预测测试集 clf.fit(X_train, y_train) y_pred2 = clf.predict(X_test) # 输出准确率 print("4:1的准确率：", clf.score(X_test, y_test)) # 重新划分训练集和测试集，比例为9:1 X_train, X_test, y_train, y_test = train_test_split(wine.data, wine.target, test_size=0.1, random_state=42) # 训练模型并预测测试集 clf.fit(X_train, y_train) y_pred3 = clf.predict(X_test) # 输出准确率 print("9:1的准确率：", clf.score(X_test, y_test))

现在，我会使用 Python 的 Matplotlib 库来绘制折线图，以显示这4种数据集划分方式的准确率。以下是绘制折线图的代码示例： python import matplotlib.pyplot as plt # 计算每种数据集划分方式的准确率 acc_73 ...

提取目标变量和特征变量 scaler = StandardScaler() X = df.iloc[:, 4:] # 特征数据 X = scaler.fit_transform(X) y_1 = df[[‘U(Ⅳ)浓度’]] # 目标变量1 y_2 = df[[‘U(Ⅵ)浓度’]] # 目标变量2 y_3 = df[[‘硝酸浓度’]] # 目标变量2 随机划分数据集 X_train_1, X_test_1, y_train_1, y_test_1 = train_test_split(X, y_1, test_size=0.2, random_state=42) X_train_2, X_test_2, y_train_2, y_test_2 = train_test_split(X, y_2, test_size=0.2, random_state=42) X_train_3, X_test_3, y_train_3, y_test_3 = train_test_split(X, y_3, test_size=0.2, random_state=42) 对特征变量进行标准化 scaler = StandardScaler() X_train_1_std = scaler.fit_transform(X_train_1) X_test_1_std = scaler.transform(X_test_1) X_train_2_std = scaler.fit_transform(X_train_2) X_test_2_std = scaler.transform(X_test_2) X_train_3_std = scaler.fit_transform(X_train_3) X_test_3_std = scaler.transform(X_test_3) 建立随机森林模型并进行训练 rf_1 = RandomForestRegressor(n_estimators=1000, random_state=42) rf_1.fit(X_train_1_std, y_train_1) rf_2 = RandomForestRegressor(n_estimators=1000, random_state=42) rf_2.fit(X_train_2_std, y_train_2) rf_3 = RandomForestRegressor(n_estimators=1000, random_state=42) rf_3.fit(X_train_3_std, y_train_3) 对测试集进行预测并计算准确性 accuracy_1 = rf_1.score(X_test_1_std, y_test_1) accuracy_2 = rf_2.score(X_test_2_std, y_test_2) accuracy_3 = rf_3.score(X_test_3_std, y_test_3) print(‘U(Ⅳ)浓度的预测准确度为： {:.2f}%’.format(accuracy_1 * 100)) print(‘U(Ⅵ)浓度的预测准确度为： {:.2f}%’.format(accuracy_2 * 100)) print(‘U(Ⅵ)浓度的预测准确度为： {:.2f}%’.format(accuracy_3 * 100)) 请使用代码通过绘制图表的方式说明该随机森林中决策树的生成过程，给出我相应的代码请不要使用graphviz软件

要通过绘制图表的方式说明随机森林中决策树的生成过程，我们可以使用sklearn库中的plot_tree()函数。该函数可以绘制单棵树的结构，我们可以使用循环将随机森林中每一棵树的结构都绘制出来。下面是相应的代码： ...

帮我改进一下 from sklearn.neighbors import KNeighborsClassifier from sklearn.datasets import load_digits from sklearn import svm, metrics from sklearn.model_selection import train_test_split import matplotlib.pyplot as plt from sklearn.metrics import confusion_matrix from sklearn.metrics import plot_confusion_matrix from sklearn.naive_bayes import GaussianNB #使绘图支持中文字符 from matplotlib import rcParams rcParams['font.family'] = 'SimHei' plt.rcParams['axes.unicode_minus'] = False # In[2]: digits = load_digits() data = digits.data print(data[0]) print(digits.images[0]) print(digits.target[0]) plt.imshow(digits.images[0]) plt.show() # In[3]: train_x, test_x, train_y, test_y = train_test_split(data, digits.target, test_size=0.3, random_state=82) print(train_x) gnb = GaussianNB() gnb.fit(train_x, train_y) print("训练集得分: %.4lf" % gnb.score(train_x, train_y)) print("测试集得分: %.4lf" % gnb.score(test_x, test_y)) print(gnb.predict(data)) plot_confusion_matrix(gnb, test_x, test_y) plt.show() # In[5]: ################################################################# fig = plt.figure(figsize=(6,13)) for i in range(40): y_pred = gnb.fit(train_x, train_y).predict([data[i]]) plt.subplot(8,5,i+1) plt.imshow(digits.images[i], interpolation='none') plt.title("%d---->%d"%(digits.target[i],y_pred)) plt.show()

train_x, test_x, train_y, test_y = train_test_split(data, digits.target, test_size=0.3, random_state=82) print(train_x) # 使用高斯朴素贝叶斯进行训练和预测 gnb = GaussianNB() gnb.fit(train_x, train_y)...

python已有y_test为测试集，y_train为训练集，如何绘制ROC图

下面是一个使用 scikit-learn 库绘制 ROC 曲线的示例代码，假设 y_test 和 y_pred 为测试集标签和模型预测标签： from sklearn.metrics import roc_curve, auc # 计算 FPR 和 TPR fpr, tpr, thresholds = roc_...

for epoch in range(100): train_loss, train_acc = train(model, train_loader, criterion, optimizer) test_loss, test_acc = test(model, test_loader, criterion) print('Epoch: {} Train Loss: {:.4f} Train Acc: {:.4f} Test Loss: {:.4f} Test Acc: {:.4f}'.format( epoch, train_loss, train_acc, test_loss, test_acc)) 将损失函数、准确率可视化

可以使用这些库中的图表函数来绘制损失函数和准确率的变化。以下是一个示例代码，其中使用了matplotlib库来绘制训练和测试的损失函数和准确率： python import matplotlib.pyplot as plt train_losses, ...

import numpy as np import matplotlib.pyplot as plt import pickle as pkl import pandas as pd import tensorflow.keras from tensorflow.keras.models import Sequential, Model, load_model from tensorflow.keras.layers import LSTM, GRU, Dense, RepeatVector, TimeDistributed, Input, BatchNormalization, \ multiply, concatenate, Flatten, Activation, dot from sklearn.metrics import mean_squared_error,mean_absolute_error from tensorflow.keras.optimizers import Adam from tensorflow.python.keras.utils.vis_utils import plot_model from tensorflow.keras.callbacks import EarlyStopping from keras.callbacks import ReduceLROnPlateau df = pd.read_csv('lorenz.csv') signal = df['signal'].values.reshape(-1, 1) x_train_max = 128 signal_normalize = np.divide(signal, x_train_max) def truncate(x, train_len=100): in_, out_, lbl = [], [], [] for i in range(len(x) - train_len): in_.append(x[i:(i + train_len)].tolist()) out_.append(x[i + train_len]) lbl.append(i) return np.array(in_), np.array(out_), np.array(lbl) X_in, X_out, lbl = truncate(signal_normalize, train_len=50) X_input_train = X_in[np.where(lbl <= 9500)] X_output_train = X_out[np.where(lbl <= 9500)] X_input_test = X_in[np.where(lbl > 9500)] X_output_test = X_out[np.where(lbl > 9500)] # Load model model = load_model("model_forecasting_seq2seq_lstm_lorenz.h5") opt = Adam(lr=1e-5, clipnorm=1) model.compile(loss='mean_squared_error', optimizer=opt, metrics=['mae']) #plot_model(model, to_file='model_plot.png', show_shapes=True, show_layer_names=True) # Train model early_stop = EarlyStopping(monitor='val_loss', patience=20, verbose=1, mode='min', restore_best_weights=True) #reduce_lr = ReduceLROnPlateau(monitor='val_loss', factor=0.2, patience=9, verbose=1, mode='min', min_lr=1e-5) #history = model.fit(X_train, y_train, epochs=500, batch_size=128, validation_data=(X_test, y_test),callbacks=[early_stop]) #model.save("lstm_model_lorenz.h5") # 对测试集进行预测 train_pred = model.predict(X_input_train[:, :, :]) * x_train_max test_pred = model.predict(X_input_test[:, :, :]) * x_train_max train_true = X_output_train[:, :] * x_train_max test_true = X_output_test[:, :] * x_train_max # 计算预测指标 ith_timestep = 10 # Specify the number of recursive prediction steps # List to store the predicted steps pred_len =2 predicted_steps = [] for i in range(X_output_test.shape[0]-pred_len+1): YPred =[],temdata = X_input_test[i,:] for j in range(pred_len): Ypred.append (model.predict(temdata)) temdata = [X_input_test[i,j+1:-1],YPred] # Convert the predicted steps into numpy array predicted_steps = np.array(predicted_steps) # Plot the predicted steps #plt.plot(X_output_test[0:ith_timestep], label='True') plt.plot(predicted_steps, label='Predicted') plt.legend() plt.show()

然后，使用 truncate 函数将信号序列切割成训练集和测试集，将其输入到 Seq2Seq LSTM 模型中进行训练。训练完成后，对测试集进行预测并计算预测指标，最后使用 matplotlib 库将预测结果可视化。如果需要更详细的...

# 加载数据 X = data.iloc[:, :-1].values y = data.iloc[:, -1:].values X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) # 训练模型 input_dim=13 hidden_dim=25 output_dim=1 nn=NeuralNetwork(input_dim, hidden_dim, output_dim) learning_rate=0.002 num_epochs=1000 loss_history=nn.train(X, y, learning_rate, num_epochs) plt.plot(loss_history) plt.title('loss') plt.xlabel('Epoch') plt.ylabel('MSE')根据这些代码续写预测代码

以上代码中，预测结果存储在 y_pred 变量中，真实结果存储在 y_test 变量中。接着，使用 matplotlib 库可视化预测结果和真实结果的趋势。最后，使用 mean_squared_error 和 mean_absolute_error 函数计算模型的均方...

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