AttributeError: 'module' object has no attribute 'LogisticRegression'

[boy_with_computer]

今天测试一段Mnist手写数据集出现的问题 根本不知道哪里错了啊
求大神帮忙

from __future__ import print_function

__docformat__ = 'restructedtext en'

import six.moves.cPickle as pickle
import gzip
import os
import sys
import timeit

import numpy

import theano
import theano.tensor as T

import cPickle as pickle  

classifier = pickle.load(open('best_model.pkl'))

    # compile a predictor function
predict_model = theano.function(
    inputs=[classifier.input],
    outputs=classifier.y_pred)

    # We can test it on some examples from test test
dataset='mnist.pkl.gz'
datasets = load_data(dataset)
test_set_x, test_set_y = datasets[2]
test_set_x = test_set_x.get_value()

predicted_values = predict_model(test_set_x[:10])
print("Predicted values for the first 10 examples in test set:")
print(predicted_values)

报错在pickle.load那一行