import matplotlib as mpl import matplotlib.pyplot as plt import pandas as pd from sklearn.linear_model import LinearRegression import numpy as np from sklearn.metrics import mean_absolute_error from sklearn.metrics import mean_squared_error from sklearn.metrics import r2_score mpl.rcParams['font.sans-serif']=['KaiTi'] mpl.rcParams['axes.unicode_minus']= False data=pd.read_csv('data.csv') #print(data.head) data.dropna(axis=0,how='any',inplace=True) data['单价']=data['单价'].map(lambda d:d.replace('元/平米','')) data['单价']=data['单价'].astype(float) data['总价']=data['总价'].map(lambda e:e.replace('万','')) data['总价']=data['总价'].astype(float) data['建筑面积']=data['建筑面积'].map(lambda p:p.replace('平米','')) data['建筑面积']=data['建筑面积'].astype(float) copy_d=data.copy() copy_d[['室','厅','卫']]=copy_d['户型'].str.extract('(\d+)室(\d+)厅(\d+)卫') copy_d['室']=copy_d['室'].astype(float) new_data=data[['总价','建筑面积']] new_data['室']=copy_d['室'] new_data.dropna(axis=0,how='any',inplace=True) print(new_data) new_data.loc[2583]=[None,180.00,4] data_train=new_data.loc[0:2582] x_list=['建筑面积','室'] ndata_mean=data_train.mean() ndata_std=data_train.std() data_train=(data_train-ndata_mean)/ndata_std x_train=data_train[x_list].values y_train=data_train['总价'].values svr=LinearRegression() svr.fit(x_train,y_train) x_test=((new_data[x_list]-ndata_mean[x_list])/ndata_std[x_list]).values y_test=((new_data['总价']-ndata_mean['总价'])/ndata_std).values print(y_test) y_pred=svr.predict(x_test) new_data['y_pred']=y_test*ndata_std['总价']+ndata_mean['总价'] print(new_data[['总价','y_pred']]) svr_acc=svr.score(x_test,y_test)*100 svr_mae=mean_absolute_error(x_test,y_pred) print(svr_mae)

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import matplotlib.pyplot as plt import numpy as np x = np.linspace(0, 10, 100) y = np.sin(x) plt.plot(x, y) plt.show() 三、图像布局与子图 matplotlib允许用户在一个窗口中创建多个子图，通过plt....

运行下面代码需要安装哪些包from sklearn.model_selection import train_test_split from sklearn.decomposition import PCA import pandas as pd from sklearn import svm import numpy as np import math import matplotlib.pyplot as plt import matplotlib as mpl from matplotlib import colors from sklearn.model_selection import train_test_split from sklearn import datasets from matplotlib.colors import ListedColormap from sklearn.svm import SVC from sklearn.preprocessing import StandardScaler from sklearn.model_selection import StratifiedShuffleSplit,StratifiedKFold from sklearn.model_selection import GridSearchCV from sklearn.model_selection import GridSearchCV, LeaveOneOut, cross_val_predict from sklearn.model_selection import KFold from sklearn.linear_model import LogisticRegression from sklearn.naive_bayes import GaussianNB from sklearn.neighbors import KNeighborsClassifier from sklearn import svm from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import RandomForestClassifier from sklearn.metrics import roc_auc_score from sklearn.metrics import roc_auc_score import math import datetime import multiprocessing as mp from sklearn.ensemble import StackingClassifier from sklearn.pipeline import make_pipeline from sklearn.svm import LinearSVC import random

- pandas：提供了高性能、易于使用的数据结构和数据分析工具。可以使用pip install pandas进行安装。 - matplotlib：用于绘制图表和数据可视化的库。可以使用pip install matplotlib进行安装。这些包是常用的...

在Python中想运行from sklearn.model_selection import train_test_split from sklearn.decomposition import PCA import pandas as pd from sklearn import svm import numpy as np import math import matplotlib.pyplot as plt import matplotlib as mpl from matplotlib import colors from sklearn.model_selection import train_test_split from sklearn import datasets from matplotlib.colors import ListedColormap from sklearn.svm import SVC from sklearn.preprocessing import StandardScaler from sklearn.model_selection import StratifiedShuffleSplit,StratifiedKFold from sklearn.model_selection import GridSearchCV from sklearn.model_selection import GridSearchCV, LeaveOneOut, cross_val_predict from sklearn.model_selection import KFold from sklearn.linear_model import LogisticRegression from sklearn.naive_bayes import GaussianNB from sklearn.neighbors import KNeighborsClassifier from sklearn import svm from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import RandomForestClassifier from sklearn.metrics import roc_auc_score from sklearn.metrics import roc_auc_score import math import datetime import multiprocessing as mp from sklearn.ensemble import StackingClassifier from sklearn.pipeline import make_pipeline from sklearn.svm import LinearSVC import random怎么操作

from sklearn.linear_model import LogisticRegression from sklearn.naive_bayes import GaussianNB from sklearn.neighbors import KNeighborsClassifier from sklearn.tree import DecisionTreeClassifier from ...

import matplotlib as mpl import matplotlib.pyplot as plt import pandas as pd from sklearn.linear_model import LinearRegression import numpy as np from sklearn.metrics import mean_absolute_error from sklearn.metrics import mean_squared_error from sklearn.metrics import r2_score mpl.rcParams['font.sans-serif']=['KaiTi'] mpl.rcParams['axes.unicode_minus']= False data=pd.read_csv('data.csv') #print(data.head) data.dropna(axis=0,how='any',inplace=True) data['单价']=data['单价'].map(lambda d:d.replace('元/平米','')) data['单价']=data['单价'].astype(float) data['总价']=data['总价'].map(lambda e:e.replace('万','')) data['总价']=data['总价'].astype(float) data['建筑面积']=data['建筑面积'].map(lambda p:p.replace('平米','')) data['建筑面积']=data['建筑面积'].astype(float) copy_d=data.copy() copy_d[['室','厅','卫']]=copy_d['户型'].str.extract('(\d+)室(\d+)厅(\d+)卫') copy_d['室']=copy_d['室'].astype(float) new_data=data[['总价','建筑面积']] new_data['室']=copy_d['室'] new_data.dropna(axis=0,how='any',inplace=True) print(new_data) new_data.loc[2583]=[None,180.00,4] data_train=new_data.loc[0:2582] x_list=['建筑面积','室'] ndata_mean=data_train.mean() ndata_std=data_train.std() data_train=(data_train-ndata_mean)/ndata_std x_train=data_train[x_list].values y_train=data_train['总价'].values svr=LinearRegression() svr.fit(x_train,y_train) x_test=((new_data[x_list]-ndata_mean[x_list])/ndata_std[x_list]).values y_test=svr.predict(x_test) print(y_test) new_data['y_pred']=y_testndata_std['总价']+ndata_mean['总价'] print(new_data[['总价','y_pred']]) svr_acc=svr.score(x_test,y_test)100 svr_mae=mean_absolute_error(x_test,y_test) print(svr_mae)

new_data.loc[2583] = [np.nan, 180.00, 4] 最后，第 41 行代码中的 score 函数用于评估模型的拟合程度，应该传入测试集的特征值 x_test 和真实的目标值 new_data['总价']，而你传入的是 y_test，这也...

import warnings warnings.filterwarnings("ignore") # from future import absolute_import, division, print_function, unicode_literals import tensorflow as tf import matplotlib as mpl import matplotlib.pyplot as plt %matplotlib inline import numpy as np import os import pandas as pd mpl.rcParams['figure.figsize'] = (8, 6) mpl.rcParams['axes.grid'] = False df = pd.read_csv('jena_climate_2009_2016.csv') df.head()

请确保您已经安装了所需的库（如pandas和matplotlib）并且文件jena_climate_2009_2016.csv位于当前工作目录中。如果文件不在当前目录中，您需要提供正确的文件路径。如果您遇到任何错误，请提供完整的错误...

import pandas as pd ex = pd.read_excel('豆瓣音乐Top250.xls', index_col=0) ex.to_csv("豆瓣音乐Top250.csv", encoding="utf-8") import pandas as pda import numpy as np import matplotlib as mpl import matplotlib.pyplot as plt mpl.rcParams['font.family'] = 'SimHei' mpl.rcParams['axes.unicode_minus'] = False mpl.rcParams['font.size'] = 15 df = pd.read_csv('豆瓣音乐Top250.csv') display(df)

然后，我们导入了其他需要的库，包括numpy、matplotlib等，并对matplotlib进行了一些配置，以便在绘图时能够正确显示中文字符。最后，使用pd.read_csv()函数读取名为"豆瓣音乐Top250.csv"的CSV文件，并将其...

import numpy as np import pandas as pd from tqdm import tqdm#进度条设置 import matplotlib.pyplot as plt from pylab import * import matplotlib; matplotlib.use('TkAgg') mpl.rcParams['font.sans-serif'] = ['SimHei'] mpl.rcParams['axes.unicode_minus'] = False

这段代码是用于导入一些常用...其中，numpy和pandas库是用于数据处理的常用库，tqdm库是用于显示进度条的库，matplotlib和pylab库是用于数据可视化的常用库。如果你要进行数据处理和可视化的话，这些库都是非常有用的。

import+numpy+as+np+import+pandas+as+pd+import+matplotlib+as+mpl+import+matplotlib.pyplot+as+plt+from

import numpy as np: 这行代码是将numpy库导入，并将其命名为np，以便在后续代码中使用np来调用numpy库的函数和方法。 import pandas as pd: 这行代码是将pandas库导入，并将其命名为pd，以便在后续代码中使用pd来...

import pandas as pd import numpy as np import matplotlib.pyplot as plt import seaborn as sns from pandas_profiling import ProfileReport from sklearn import datasets from mpl_toolkits.mplot3d import Axes3D from sklearn.decomposition import PCA from sklearn.preprocessing import StandardScaler data=pd.read_csv('H:/analysis_results/mean_HN.csv') columns=['folder', 'volume', 'convex_volume', 'surface_area','length','max_width', 'max_depth'] data.head() values=data.iloc[:,1:7] correlation=values.corr() fig,ax=plt.subplots(figsize=(12,10)) sns.heatmap(correlation,annot=True,annot_kws={'size':16},cmap='Reds',square=True,ax=ax) sns.pairplot(data,hue='folder') plt.show()出现报错import pandas_profiling is going to be deprecated by April 1st. Please use import ydata_profiling instead. from pandas_profiling import ProfileReport，如何修改

import matplotlib.pyplot as plt import seaborn as sns from ydata_profiling import ProfileReport from sklearn import datasets from mpl_toolkits.mplot3d import Axes3D from sklearn.decomposition ...

import pandas as pd import numpy as np import matplotlib as mpl import matplotlib.pyplot as plt mpl.rcParams['axes.unicode_minus'] = False df = pd.read_csv('merged_sentiment_idx.csv', parse_dates=['created_time']) df.set_index(df.created_time, inplace=True) df = df.loc['2017-4-15':'2018-4-15'] fig, ax1 = plt.subplots() ax2 = ax1.twinx() ax1.plot(df.index, df['BI_MA'], color='#1F77B4', linestyle=':') ax2.plot(df.index, df['close'], color='#4B73B1') ax1.set_xlabel('日期') ax1.set_ylabel('BI指标') ax2.set_ylabel('上证指数') plt.show()

这是一个使用Pandas、Numpy、Matplotlib库进行数据分析和可视化的Python代码。首先，从'merged_sentiment_idx.csv'文件中读取数据并设置时间戳为索引，然后选择了2017年4月15日至2018年4月15日的数据。接着，使用...

# 导入包 import pandas as pd import matplotlib as mpl import numpy as np import matplotlib.pyplot as plt import seaborn as sns plt.rcParams['font.sans-serif'] = ['SimHei'] plt.rcParams['axes.unicode_minus']=False mpl.use('TkAgg') # 导入数据 df = pd.read_csv(r'C:\Users\F\Desktop\3变量\data/CS2_35.csv') df_coor = df.corr() print(df_coor) fig, ax = plt.subplots(figsize=(8,6),facecolor='w') # 指定颜色带的色系 sns.heatmap(df.corr(),annot=True, vmax=1, square=True, cmap="Blues", fmt='.3g') plt.title('CS2_38') plt.show() fig.savefig('./df_corr.png',bbox_inches='tight',transparent=True)，帮我解释下这个代码用的方法和原理

1. 导入包：分别导入了 pandas、matplotlib、numpy、seaborn 等常用的数据分析和可视化包，其中 plt.rcParams['font.sans-serif'] = ['SimHei'] 和 plt.rcParams['axes.unicode_minus']=False 用于解决中文显示和...

解释下这段代码import csv import pandas as pd from matplotlib import pyplot as plt from pylab import mpl import numpy as np # 设置显示中文字体 mpl.rcParams["font.sans-serif"] = ["SimHei"]

1. 导入了csv、pandas、matplotlib.pyplot、pylab.mpl和numpy等库，这些库都是数据分析和可视化常用的库。 2. 设置了显示中文的字体为SimHei，保证在可视化时能够正常显示中文。 3. 在导入matplotlib.pyplot时，...

import pandas as pd import numpy as np import matplotlib.pyplot as plt from sklearn import datasets from mpl_toolkits.mplot3d import Axes3D from sklearn.decomposition import PCA from sklearn.preprocessing import StandardScaler data=pd.read_csv('H:/analysis_results/mean_HN.csv') data.head() x=data.iloc[:,1:7] y=data.iloc[:,6] scaler=StandardScaler() scaler.fit(x) x_scaler=scaler.transform(x) print(x_scaler.shape) pca=PCA(n_components=3) x_pca=pca.fit_transform(x_scaler) print(x_pca.shape) #查看各个主成分对应的方差大小和占全部方差的比例 #可以看到前2个主成分已经解释了样本分布的90%的差异了 print('explained_variance_:',pca.explained_variance_) print('explained_variance_ratio_:',pca.explained_variance_ratio_) print('total explained variance ratio of first 6 principal components:',sum(pca.explained_variance_ratio_)) #可视化各个主成分贡献的方差 #fig1=plt.figure(figsize=(10,10)) #plt.rcParams['figure.dpi'] = 300#设置像素参数值 plt.rcParams['path.simplify'] = False#禁用抗锯齿效果 plt.figure() plt.plot(np.arange(1,4),pca.explained_variance_,color='blue', linestyle='-',linewidth=2) plt.xticks(np.arange(1, 4, 1))#修改X轴间隔为1 plt.title('PCA_plot_HN') plt.xlabel('components_n',fontsize=16) plt.ylabel('explained_variance_',fontsize=16) plt.show() plt.pause(0.5) plt.savefig('H:/analysis_results/Cluster analysis/pca_explained_variance_HN.png')保存的图像中，一片空白，如何修改

import matplotlib.pyplot as plt from sklearn import datasets from mpl_toolkits.mplot3d import Axes3D from sklearn.decomposition import PCA from sklearn.preprocessing import StandardScaler data =...

import numpy as np import pandas as pd from sklearn.model_selection import train_test_split from keras.models import Sequential from keras.layers import Dense from pyswarm import pso import matplotlib.pyplot as plt from sklearn.preprocessing import StandardScaler from sklearn.metrics import mean_absolute_error from sklearn.metrics import mean_squared_error from sklearn.metrics import r2_score file = "zhong.xlsx" data = pd.read_excel(file) #reading file X=np.array(data.loc[:,'种植密度':'有效积温']) y=np.array(data.loc[:,'产量']) y.shape=(185,1) # 将数据集分为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X,y, test_size=0.25, random_state=10) SC=StandardScaler() X_train=SC.fit_transform(X_train) X_test=SC.fit_transform(X_test) y_train=SC.fit_transform(y_train) y_test=SC.fit_transform(y_test) print("X_train.shape:", X_train.shape) print("X_test.shape:", X_test.shape) print("y_train.shape:", y_train.shape) print("y_test.shape:", y_test.shape) # 定义BP神经网络模型 def nn_model(X): model = Sequential() model.add(Dense(8, input_dim=X_train.shape[1], activation='relu')) model.add(Dense(12, activation='relu')) model.add(Dense(1)) model.compile(loss='mean_squared_error', optimizer='adam') return model # 定义适应度函数 def fitness_func(X): model = nn_model(X) model.fit(X_train, y_train, epochs=60, verbose=2) score = model.evaluate(X_test, y_test, verbose=2) print(score) # 定义变量的下限和上限 lb = [5, 5] ub = [30, 30] # 利用PySwarm库实现改进的粒子群算法来优化BP神经网络预测模型 result = pso(fitness_func, lb, ub) # 输出最优解和函数值 print('最优解:', result[0]) print('最小函数值:', result[1]) mpl.rcParams["font.family"] = "SimHei" mpl.rcParams["axes.unicode_minus"] = False # 绘制预测值和真实值对比图 model = nn_model(X) model.fit(X_train, y_train, epochs=60, verbose=2) y_pred = model.predict(X_test) y_true = SC.inverse_transform(y_test) y_pred=SC.inverse_transform(y_pred) plt.figure() plt.plot(y_true,"bo-",label = '真实值') plt.plot(y_pred,"ro-", label = '预测值') plt.title('神经网络预测展示') plt.xlabel('序号') plt.ylabel('产量') plt.legend(loc='upper right') plt.show() print("R2 = ",r2_score(y_test, y_pred)) # R2 # 绘制损失函数曲线图 model = nn_model(X) history = model.fit(X_train, y_train, epochs=60, validation_data=(X_test, y_test), verbose=2) plt.plot(history.history['loss'], label='train') plt.plot(history.history['val_loss'], label='test') plt.legend() plt.show() mae = mean_absolute_error(y_test, y_pred) print('MAE: %.3f' % mae) mse = mean_squared_error(y_test, y_pred) print('mse: %.3f' % mse)

例如，应该将import numpy as np import pandas as pd分开成两行导入。其次，在进行数据标准化时，你应该使用同一个StandardScaler对象对训练集和测试集进行转换，而不是分别创建两个不同的对象进行转换。应该...

def plot_rate( rate_his, rolling_intv = 50, ylabel='标准化计算速率',ax=None): import matplotlib.pyplot as plt import pandas as pd import matplotlib as mpl rate_array = np.asarray(rate_his) # 将一个 Python 列表 rate_his 转换为 NumPy 数组 rate_array df = pd.DataFrame(rate_his) # 创建了一个名为df的Pandas DataFrame对象，将rata_his数据进行索引拆分过滤排序 if ax is None: fig, ax = plt.subplots(figsize=(15, 8)) mpl.style.use('seaborn') #设置matplotlib 库的绘图风格为 seaborn 风格 fig, ax = plt.subplots(figsize=(15,8))# 使用 Matplotlib 库创建一个带有指定大小的子图对象，宽为15，高为8 plt.plot(np.arange(len(rate_array))+1, np.hstack(df.rolling(rolling_intv, min_periods=1).mean().values), 'b') #使用plt.plot函数将生成的x轴和y轴坐标绘制成折线图，并且'b' 表示蓝色的线条。 plt.fill_between(np.arange(len(rate_array))+1, np.hstack(df.rolling(rolling_intv, min_periods=1).min()[0].values), np.hstack(df.rolling(rolling_intv, min_periods=1).max()[0].values), color = 'b', alpha = 0.2) #将这两个曲线之间的区域填充成颜色为蓝色、透明度为0.2的矩形 plt.ylabel(ylabel)# 设置纵轴标签 plt.xlabel('Time Frames')#设置横轴标签 plt.show()， plot_rate(Q.sum(axis=1)/N, 100, 'Average Data Queue') plot_rate(energy.sum(axis=1)/N, 100, 'Average Energy Consumption')，将多个函数绘制于横坐标相同的同一张图

import matplotlib.pyplot as plt def plot_rate(rate_his, rolling_intv=50, ylabel='标准化计算速率', ax=None): import pandas as pd import matplotlib as mpl rate_array = np.asarray(rate_his) df = pd....

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