• 使用神经网络-垃圾邮件检测-LSTM或者CNN(一维卷积)效果都不错【代码有问题,pass】


    from sklearn.feature_extraction.text import CountVectorizer
    import os
    from sklearn.naive_bayes import GaussianNB
    from sklearn.model_selection import train_test_split
    from sklearn import metrics
    import matplotlib.pyplot as plt
    import numpy as np
    from sklearn import svm
    from sklearn.feature_extraction.text import TfidfTransformer
    import tensorflow as tf
    import tflearn
    from tflearn.layers.core import input_data, dropout, fully_connected
    from tflearn.layers.conv import conv_1d, global_max_pool
    from tflearn.layers.conv import conv_2d, max_pool_2d
    from tflearn.layers.merge_ops import merge
    from tflearn.layers.estimator import regression
    from tflearn.data_utils import to_categorical, pad_sequences
    from sklearn.neural_network import MLPClassifier
    from tflearn.layers.normalization import local_response_normalization
    from tensorflow.contrib import learn
    
    
    max_features=500
    max_document_length=1024
    
    
    
    def load_one_file(filename):
        x=""
        with open(filename) as f:
            for line in f:
                line=line.strip('
    ')
                line = line.strip('
    ')
                x+=line
        return x
    
    def load_files_from_dir(rootdir):
        x=[]
        list = os.listdir(rootdir)
        for i in range(0, len(list)):
            path = os.path.join(rootdir, list[i])
            if os.path.isfile(path):
                v=load_one_file(path)
                x.append(v)
        return x
    
    def load_all_files():
        ham=[]
        spam=[]
        for i in range(1,5):
            path="../data/mail/enron%d/ham/" % i
            print "Load %s" % path
            ham+=load_files_from_dir(path)
            path="../data/mail/enron%d/spam/" % i
            print "Load %s" % path
            spam+=load_files_from_dir(path)
        return ham,spam
    
    def get_features_by_wordbag():
        ham, spam=load_all_files()
        x=ham+spam
        y=[0]*len(ham)+[1]*len(spam)
        vectorizer = CountVectorizer(
                                     decode_error='ignore',
                                     strip_accents='ascii',
                                     max_features=max_features,
                                     stop_words='english',
                                     max_df=1.0,
                                     min_df=1 )
        print vectorizer
        x=vectorizer.fit_transform(x)
        x=x.toarray()
        return x,y
    
    def show_diffrent_max_features():
        global max_features
        a=[]
        b=[]
        for i in range(1000,20000,2000):
            max_features=i
            print "max_features=%d" % i
            x, y = get_features_by_wordbag()
            x_train, x_test, y_train, y_test = train_test_split(x, y, test_size=0.4, random_state=0)
            gnb = GaussianNB()
            gnb.fit(x_train, y_train)
            y_pred = gnb.predict(x_test)
            score=metrics.accuracy_score(y_test, y_pred)
            a.append(max_features)
            b.append(score)
            plt.plot(a, b, 'r')
        plt.xlabel("max_features")
        plt.ylabel("metrics.accuracy_score")
        plt.title("metrics.accuracy_score VS max_features")
        plt.legend()
        plt.show()
    
    def do_nb_wordbag(x_train, x_test, y_train, y_test):
        print "NB and wordbag"
        gnb = GaussianNB()
        gnb.fit(x_train,y_train)
        y_pred=gnb.predict(x_test)
        print metrics.accuracy_score(y_test, y_pred)
        print metrics.confusion_matrix(y_test, y_pred)
    
    def do_svm_wordbag(x_train, x_test, y_train, y_test):
        print "SVM and wordbag"
        clf = svm.SVC()
        clf.fit(x_train, y_train)
        y_pred = clf.predict(x_test)
        print metrics.accuracy_score(y_test, y_pred)
        print metrics.confusion_matrix(y_test, y_pred)
    
    def get_features_by_wordbag_tfidf():
        ham, spam=load_all_files()
        x=ham+spam
        y=[0]*len(ham)+[1]*len(spam)
        vectorizer = CountVectorizer(binary=True,
                                     decode_error='ignore',
                                     strip_accents='ascii',
                                     max_features=max_features,
                                     stop_words='english',
                                     max_df=1.0,
                                     min_df=1 )
        print vectorizer
        x=vectorizer.fit_transform(x)
        x=x.toarray()
        transformer = TfidfTransformer(smooth_idf=False)
        print transformer
        tfidf = transformer.fit_transform(x)
        x = tfidf.toarray()
        return  x,y
    
    
    def do_cnn_wordbag(trainX, testX, trainY, testY):
        global max_document_length
        print "CNN and tf"
    
        trainX = pad_sequences(trainX, maxlen=max_document_length, value=0.)
        testX = pad_sequences(testX, maxlen=max_document_length, value=0.)
        # Converting labels to binary vectors
        trainY = to_categorical(trainY, nb_classes=2)
        testY = to_categorical(testY, nb_classes=2)
    
        # Building convolutional network
        network = input_data(shape=[None,max_document_length], name='input')
        network = tflearn.embedding(network, input_dim=1000000, output_dim=128)
        branch1 = conv_1d(network, 128, 3, padding='valid', activation='relu', regularizer="L2")
        branch2 = conv_1d(network, 128, 4, padding='valid', activation='relu', regularizer="L2")
        branch3 = conv_1d(network, 128, 5, padding='valid', activation='relu', regularizer="L2")
        network = merge([branch1, branch2, branch3], mode='concat', axis=1)
        network = tf.expand_dims(network, 2)
        network = global_max_pool(network)
        network = dropout(network, 0.8)
        network = fully_connected(network, 2, activation='softmax')
        network = regression(network, optimizer='adam', learning_rate=0.001,
                             loss='categorical_crossentropy', name='target')
        # Training
        model = tflearn.DNN(network, tensorboard_verbose=0)
        model.fit(trainX, trainY,
                  n_epoch=5, shuffle=True, validation_set=(testX, testY),
                  show_metric=True, batch_size=100,run_id="spam")
    
    def do_rnn_wordbag(trainX, testX, trainY, testY):
        global max_document_length
        print "RNN and wordbag"
    
        trainX = pad_sequences(trainX, maxlen=max_document_length, value=0.)
        testX = pad_sequences(testX, maxlen=max_document_length, value=0.)
        # Converting labels to binary vectors
        trainY = to_categorical(trainY, nb_classes=2)
        testY = to_categorical(testY, nb_classes=2)
    
        # Network building
        net = tflearn.input_data([None, max_document_length])
        net = tflearn.embedding(net, input_dim=10240000, output_dim=128)
        net = tflearn.lstm(net, 128, dropout=0.8)
        net = tflearn.fully_connected(net, 2, activation='softmax')
        net = tflearn.regression(net, optimizer='adam', learning_rate=0.001,
                                 loss='categorical_crossentropy')
    
        # Training
        model = tflearn.DNN(net, tensorboard_verbose=0)
        model.fit(trainX, trainY, validation_set=(testX, testY), show_metric=True,
                  batch_size=10,run_id="spm-run",n_epoch=5)
    
    
    def do_dnn_wordbag(x_train, x_test, y_train, y_testY):
        print "DNN and wordbag"
    
        # Building deep neural network
        clf = MLPClassifier(solver='lbfgs',
                            alpha=1e-5,
                            hidden_layer_sizes = (5, 2),
                            random_state = 1)
        print  clf
        clf.fit(x_train, y_train)
        y_pred = clf.predict(x_test)
        print metrics.accuracy_score(y_test, y_pred)
        print metrics.confusion_matrix(y_test, y_pred)
    
    
    
    def  get_features_by_tf():
        global  max_document_length
        x=[]
        y=[]
        ham, spam=load_all_files()
        x=ham+spam
        y=[0]*len(ham)+[1]*len(spam)
        vp=tflearn.data_utils.VocabularyProcessor(max_document_length=max_document_length,
                                                  min_frequency=0,
                                                  vocabulary=None,
                                                  tokenizer_fn=None)
        x=vp.fit_transform(x, unused_y=None)
        x=np.array(list(x))
        return x,y
    
    
    
    if __name__ == "__main__":
        print "Hello spam-mail"
        #print "get_features_by_wordbag"
        #x,y=get_features_by_wordbag()
        #x_train, x_test, y_train, y_test = train_test_split(x, y, test_size = 0.4, random_state = 0)
    
        #print "get_features_by_wordbag_tfidf"
        #x,y=get_features_by_wordbag_tfidf()
        #x_train, x_test, y_train, y_test = train_test_split(x, y, test_size = 0.4, random_state = 0)
        #NB
        #do_nb_wordbag(x_train, x_test, y_train, y_test)
        #show_diffrent_max_features()
    
        #SVM
        #do_svm_wordbag(x_train, x_test, y_train, y_test)
    
        #DNN
        #do_dnn_wordbag(x_train, x_test, y_train, y_test)
    
        print "get_features_by_tf"
        x,y=get_features_by_wordbag()
        x_train, x_test, y_train, y_test = train_test_split(x, y, test_size = 0.4, random_state = 0)
        #CNN
        do_cnn_wordbag(x_train, x_test, y_train, y_test)
    
    
        #RNN
        #do_rnn_wordbag(x_train, x_test, y_train, y_test)

    自己写检测算法的时候也记得多个算法比较下

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  • 原文地址:https://www.cnblogs.com/bonelee/p/7908573.html
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