无法在<module'__main __'>

编程问答 2022-06-12

问题描述

我的一个笔记本中有一个课，如下所示：

class MyScaler(BaseEstimator,TransformerMixin):
    def __init__(self,columns,with_mean=True,with_std=True,copy=True):
        self.scaler = StandardScaler(copy,with_mean,with_std)
        self.columns = columns
        self.mean_ = None
        self.var_ = None

    def fit(self,X,y=None):
        self.scaler.fit(X[self.columns],y)
        self.mean_ = np.array(np.mean(X[self.columns]))
        self.var_ = np.array(np.var(X[self.columns]))
        return self

    def transform(self,y=None,copy=None):
        initial_col_order = X.columns
        X_scaled = pd.DataFrame(self.scaler.transform(X[self.columns]),columns=self.columns)
        X_not_scaled = X.loc[:,~X.columns.isin(self.columns)]
        return pd.concat([X_not_scaled,X_scaled],axis=1)[initial_col_order]

我把这堂课腌制为：

with open('Custom_Scaler','wb') as file:
    pickle.dump(MyScaler,file)

我有另一个模块'LogReg_Absent_Module'，在这里我试图解开该文件。我还在该模块中定义了此类，如下所示：

import pandas as pd
import numpy as np
import pickle
from sklearn.preprocessing import StandardScaler
from sklearn.base import BaseEstimator,TransformerMixin

#The custom scaler that only scales the non-dummy value columns.
class MyScaler(BaseEstimator,axis=1)[initial_col_order]

#The class that we are going to use from here on to predict new data
class absenteeism_model():
    def __init__(self,model_file,scaler_file):
        with open('Absenteeism_Model','rb') as model_file,open('Custom_Scaler','rb') as scaler_file:
            self.log_reg = pickle.load(model_file)             #Load the prevIoUsly saved model 
            self.scaler = pickle.load(scaler_file)             #and scaler.
            self.data = None

在新笔记本上，当我尝试model = absenteeism_model('Absenteeism_Model','Custom_Scaler')

我得到：

<ipython-input-66-8631c175353f> in <module>
----> 1 model = absenteeism_model('Absenteeism_Model','Custom_Scaler')

~\LogReg_Absent_Module.py in __init__(self,scaler_file)
    37         with open('Absenteeism_Model','rb') as scaler_file:
    38             self.log_reg = pickle.load(model_file)             #Load the prevIoUsly saved model
---> 39             self.scaler = pickle.load(scaler_file)             #and scaler.
    40             self.data = None
    41 

AttributeError: Can't get attribute 'MyScaler' on <module '__main__'>```

解决方法

我不明白您为什么要腌制一个班级而不是该班级的对象

,

您介意显示实现MyScaler的零件代码。我认为保存缩放器时MyScaler类的对象有问题。

例如，您已声明：

scaler = MyScaler(X)

然后在这种情况下，您将使用以下代码腌制：

 with open ('Custom_Scaler','wb') as file: 
  pickle.dump(scaler,file)

看看这是否可以解决您的问题。

attributeerrormodulemodulepython