我在 jupyter notebook python 上使用天气预报代码

Question

我正在研究一个基于机器学习线性回归的天气预报项目。我使用了以下代码，但收到错误 only 2 arguments accepted 代码如下：

from sklearn.linear_model import LinearRegression
import numpy as np
X=df.drop(['PrecipitationSumInches'], axis=1)
Y=df['PrecipitationSumInches']
Y=Y.values.reshape(-1,1)
day_index=798
days=[i for i in range(Y.size)]
clf=LinearRegression()
clf.fit(X,Y)
inp=np.array([74],[60],[45],[67],[49],[43],[33],[45],[57], 
[29.68],[10],[7],[2],[0],[20],[4],[31])
inp=inp.reshape(1,-1)
print("The Precipitation in inches for the input is:",
clf.predict(inp))

Answer 1

这不是用 numpy 创建数组的方法。

改变

inp=np.array([74],[60],[45],[67],[49],[43],[33],[45],[57],[29.68],[10],[7],[2],[0],[20],[4],[31])

收件人：

inp=np.array([74,60,45,67,49,43,33,45,57,29.68,10,7,2,0,20,4,31])

请在下次格式化您的代码并添加错误跟踪。

Answer 2

这里有一些问题。让我们退后一步，解决一个简单的回归问题，即典型的波士顿住房问题。将以下代码复制/粘贴到您的 Python 环境中，运行它，检查结果，如果您仍有问题，请回复。

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
#%matplotlib inline
import sklearn

from sklearn.datasets import load_boston
boston = load_boston()

# Now we will load the data into a pandas dataframe and then will print the first few rows of the data using the head() function.
bos = pd.DataFrame(boston.data)
bos.head()


bos.columns = ['CRIM', 'ZN', 'INDUS', 'CHAS', 'NOX', 'RM', 'AGE', 'DIS', 'RAD', 'TAX', 'PTRATIO', 'B', 'LSTAT']
bos.head()

bos['MEDV'] = boston.target


bos.describe()

bos.isnull().sum()



sns.distplot(bos['MEDV'])
plt.show()

sns.pairplot(bos)

corr_mat = bos.corr().round(2)

sns.heatmap(data=corr_mat, annot=True)

sns.lmplot(x = 'RM', y = 'MEDV', data = bos)

X = bos[['CRIM', 'ZN', 'INDUS', 'CHAS', 'NOX', 'RM', 'AGE', 'DIS', 'RAD', 'TAX','PTRATIO', 'B', 'LSTAT']]
y = bos['MEDV']


from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size = 0.2, random_state = 10)

# Training the Model
# We will now train our model using the LinearRegression function from the sklearn library.

from sklearn.linear_model import LinearRegression
lm = LinearRegression()
lm.fit(X_train, y_train)

# Prediction
# We will now make prediction on the test data using the LinearRegression function and plot a scatterplot between the test data and the predicted value.

prediction = lm.predict(X_test)
plt.scatter(y_test, prediction)

df1 = pd.DataFrame({'Actual': y_test, 'Predicted':prediction})
df2 = df1.head(10)
df2

df2.plot(kind = 'bar')

from sklearn import metrics
from sklearn.metrics import r2_score
print('MAE', metrics.mean_absolute_error(y_test, prediction))
print('MSE', metrics.mean_squared_error(y_test, prediction))
print('RMSE', np.sqrt(metrics.mean_squared_error(y_test, prediction)))
print('R squared error', r2_score(y_test, prediction))

结果：

MAE 4.061419182954711
MSE 34.413968453138565
RMSE 5.866341999333023
R squared error 0.6709339839115628

https://acadgild.com/blog/linear-regression-on-boston-housing-data

另外，看看这个。

https://github.com/chatkausik/Linear-Regression-using-Boston-Housing-data-set/blob/master/Mini_Project_Linear_Regression.ipynb

网上还有其他类似的例子。查看 Iris 数据集并尝试对其进行回归。有很多例子。复制/粘贴一些简单的代码，让它工作，如果你仍然有问题（很多这些事情是不言而喻的），请回到这里。记住，你摆脱它，你投入了什么。