LSTM初试遇到障碍，使用较熟悉的TextCNN。

1.基础知识：

Embedding:将词的十进制表示做向量化
起到降维增维的作用
嵌入维度数量（New Embedding维度）的一般经验法则：
embedding_dimensions =  number_of_categories**0.25
也就是说，嵌入矢量维数应该是类别数量的 4 次方根。如词汇量为 81，建议维数为 3。
 

SpatialDropout1D

在模型开始应用，会按一定比例丢弃一个特征图中的多个通道信息，增强特征的独立性，这和dropout是不同的。

正则化：
train_norm = train.apply(lambda x: (x - np.mean(x)) / (np.max(x) - np.min(x)))
 
2.实战
代码1（初版本）
import pickle

from keras.preprocessing.sequence import pad_sequences

from keras_preprocessing.text import Tokenizer

from keras.models import Sequential, Model

from keras.layers import Dense, Embedding, Activation, merge, Input, Lambda, Reshape, LSTM, RNN, CuDNNLSTM, \

    SimpleRNNCell, SpatialDropout1D, Add, Maximum

from keras.layers import Conv1D, Flatten, Dropout, MaxPool1D, GlobalAveragePooling1D, concatenate, AveragePooling1D

from keras import optimizers

from keras import regularizers

from keras.layers import BatchNormalization

from keras.callbacks import TensorBoard, EarlyStopping, ModelCheckpoint

from keras.utils import to_categorical

import time

import numpy as np

from keras import backend as K

from sklearn.model_selection import StratifiedKFold

import pickle

from sklearn.model_selection import train_test_split

from sklearn.feature_extraction.text import TfidfVectorizer

import time

import csv

import xgboost as xgb

import numpy as np

from sklearn.model_selection import StratifiedKFold

my_security_train = './my_security_train.pkl'

my_security_test = './my_security_test.pkl'

my_result = './my_result.pkl'

my_result_csv = './my_result.csv'

inputLen=100

# config = K.tf.ConfigProto()

# # 程序按需申请内存

# config.gpu_options.allow_growth = True

# session = K.tf.Session(config = config)

# 读取文件到变量中

with open(my_security_train, 'rb') as f:

    train_labels = pickle.load(f)

    train_apis = pickle.load(f)

with open(my_security_test, 'rb') as f:

    test_files = pickle.load(f)

    test_apis = pickle.load(f)

# print(time.strftime("%Y-%m-%d-%H-%M-%S", time.localtime()))

# tensorboard = TensorBoard('./Logs/', write_images=1, histogram_freq=1)

# print(train_labels)

# 将标签转换为空格相隔的一维数组

train_labels = np.asarray(train_labels)

# print(train_labels)

tokenizer = Tokenizer(num_words=None,

                      filters='!"#$%&()*+,-./:;<=>?@[\]^_`{|}~\t\n',

                      lower=True,

                      split=" ",

                      char_level=False)

# print(train_apis)

# 通过训练和测试数据集丰富取词器的字典，方便后续操作

tokenizer.fit_on_texts(train_apis)

# print(train_apis)

# print(test_apis)

tokenizer.fit_on_texts(test_apis)

# print(test_apis)

# print(tokenizer.word_index)

# #获取目前提取词的字典信息

# # vocal = tokenizer.word_index

train_apis = tokenizer.texts_to_sequences(train_apis)

# 通过字典信息将字符转换为对应的数字

test_apis = tokenizer.texts_to_sequences(test_apis)

# print(test_apis)

# 序列化原数组为没有逗号的数组，默认在前面填充,默认截断前面的

train_apis = pad_sequences(train_apis, inputLen, padding='post', truncating='post')

# print(test_apis)

test_apis = pad_sequences(test_apis, inputLen, padding='post', truncating='post')

# print(test_apis)

def SequenceModel():

    # Sequential()是序列模型，其实是堆叠模型，可以在它上面堆砌网络形成一个复杂的网络结构

    model = Sequential()

    model.add(Dense(32, activation='relu', input_dim=6000))

    model.add(Dense(8, activation='softmax'))

    return model

def lstm():

    my_inpuy = Input(shape = (6000,), dtype = 'float64')

    #在网络第一层，起降维的作用

    emb = Embedding(len(tokenizer.word_index)+1, 256, input_length=6000)

    emb = emb(my_inpuy)

    net = Conv1D(16, 3, padding='same', kernel_initializer='glorot_uniform')(emb)

    net = BatchNormalization()(net)

    net = Activation('relu')(net)

    net = Conv1D(32, 3, padding='same', kernel_initializer='glorot_uniform')(net)

    net = BatchNormalization()(net)

    net = Activation('relu')(net)

    net = MaxPool1D(pool_size=4)(net)

    net1 = Conv1D(16, 4, padding='same', kernel_initializer='glorot_uniform')(emb)

    net1 = BatchNormalization()(net1)

    net1 = Activation('relu')(net1)

    net1 = Conv1D(32, 4, padding='same', kernel_initializer='glorot_uniform')(net1)

    net1 = BatchNormalization()(net1)

    net1 = Activation('relu')(net1)

    net1 = MaxPool1D(pool_size=4)(net1)

    net2 = Conv1D(16, 5, padding='same', kernel_initializer='glorot_uniform')(emb)

    net2 = BatchNormalization()(net2)

    net2 = Activation('relu')(net2)

    net2 = Conv1D(32, 5, padding='same', kernel_initializer='glorot_uniform')(net2)

    net2 = BatchNormalization()(net2)

    net2 = Activation('relu')(net2)

    net2 = MaxPool1D(pool_size=4)(net2)

    net = concatenate([net, net1, net2], axis=-1)

    net = CuDNNLSTM(256)(net)

    net = Dense(8, activation = 'softmax')(net)

    model = Model(inputs=my_inpuy, outputs=net)

    return model

def textcnn():

    kernel_size = [1, 3, 3, 5, 5]

    acti = 'relu'

    #可看做一个文件的api集为一句话，然后话中的词总量是6000

    my_input = Input(shape=(inputLen,), dtype='int32')

    emb = Embedding(len(tokenizer.word_index) + 1, 5, input_length=inputLen)(my_input)

    emb = SpatialDropout1D(0.2)(emb)

    net = []

    for kernel in kernel_size:

        # 32个卷积核

        con = Conv1D(32, kernel, activation=acti, padding="same")(emb)

        # 滑动窗口大小是2,默认输出最后一维是通道数

        con = MaxPool1D(2)(con)

        net.append(con)

    # print(net)

    # input()

    net = concatenate(net, axis =-1)

    # net = concatenate(net)

    # print(net)

    # input()

    net = Flatten()(net)

    net = Dropout(0.5)(net)

    net = Dense(256, activation='relu')(net)

    net = Dropout(0.5)(net)

    net = Dense(8, activation='softmax')(net)

    model = Model(inputs=my_input, outputs=net)

    return model

# model = SequenceModel()

model = textcnn()

# metrics默认只有loss，加accuracy后在model.evaluate(...)的返回值即有accuracy结果

model.compile(optimizer='adam', loss='sparse_categorical_crossentropy', metrics=['accuracy'])

# print(train_apis.shape)

# print(train_labels.shape)

# 将训练集切分成训练和验证集

skf = StratifiedKFold(n_splits=5)

for i, (train_index, valid_index) in enumerate(skf.split(train_apis, train_labels)):

    model.fit(train_apis[train_index], train_labels[train_index], epochs=10, batch_size=1000,

              validation_data=(train_apis[valid_index], train_labels[valid_index]))

    print(train_index, valid_index)

# loss, acc = model.evaluate(train_apis, train_labels)

# print(loss)

# print(acc)

# print(model.predict(train_apis))

test_apis = model.predict(test_apis)

# print(test_files)

# print(test_apis)

with open(my_result, 'wb') as f:

    pickle.dump(test_files, f)

    pickle.dump(test_apis, f)

# print(len(test_files))

# print(len(test_apis))

result = []

for i in range(len(test_files)):

    # #     print(test_files[i])

    #     #之前test_apis不带逗号的格式是矩阵格式，现在tolist转为带逗号的列表格式

    #     print(test_apis[i])

    #     print(test_apis[i].tolist())

    #     result.append(test_files[i])

    #     result.append(test_apis[i])

    tmp = []

    a = test_apis[i].tolist()

    tmp.append(test_files[i])

    # extend相比于append可以添加多个值

    tmp.extend(a)

    #     print(tmp)

    result.append(tmp)

# print(1)

# print(result)

with open(my_result_csv, 'w') as f:

    #     f.write([1,2,3])

    result_csv = csv.writer(f)

    result_csv.writerow(["file_id", "prob0", "prob1", "prob2", "prob3", "prob4", "prob5", "prob6", "prob7"])

    result_csv.writerows(result)

确定好它的原始文件api序列最大长度：13264587

增加早停机制和模型保存：
EarlyStopping的restore_best_weights参数： 如果要在停止后保存最佳权重,请将此参数设置为True。
 
代码2(加载pkl数据和训练测试部分)：
import pickle

from keras.preprocessing.sequence import pad_sequences

from keras_preprocessing.text import Tokenizer

from keras.models import Sequential, Model

from keras.layers import Dense, Embedding, Activation, merge, Input, Lambda, Reshape, LSTM, RNN, CuDNNLSTM, \

    SimpleRNNCell, SpatialDropout1D, Add, Maximum

from keras.layers import Conv1D, Flatten, Dropout, MaxPool1D, GlobalAveragePooling1D, concatenate, AveragePooling1D

from keras import optimizers

from keras import regularizers

from keras.layers import BatchNormalization

from keras.callbacks import TensorBoard, EarlyStopping, ModelCheckpoint

from keras.utils import to_categorical

import time

import numpy as np

from keras import backend as K

from sklearn.model_selection import StratifiedKFold

import pickle

from sklearn.model_selection import train_test_split

from sklearn.feature_extraction.text import TfidfVectorizer

import time

import csv

import xgboost as xgb

import numpy as np

from sklearn.model_selection import StratifiedKFold

my_security_train = './my_security_train.pkl'

my_security_test = './my_security_test.pkl'

my_result = './my_result1.pkl'

my_result_csv = './my_result1.csv'

inputLen = 5000

# config = K.tf.ConfigProto()

# # 程序按需申请内存

# config.gpu_options.allow_growth = True

# session = K.tf.Session(config = config)

# 读取文件到变量中

with open(my_security_train, 'rb') as f:

    train_labels = pickle.load(f)

    train_apis = pickle.load(f)

with open(my_security_test, 'rb') as f:

    test_files = pickle.load(f)

    test_apis = pickle.load(f)

# print(time.strftime("%Y-%m-%d-%H-%M-%S", time.localtime()))

# tensorboard = TensorBoard('./Logs/', write_images=1, histogram_freq=1)

# print(train_labels)

# 将标签转换为空格相隔的一维数组

train_labels = np.asarray(train_labels)

# print(train_labels)

tokenizer = Tokenizer(num_words=None,

                      filters='!"#$%&()*+,-./:;<=>?@[\]^_`{|}~\t\n',

                      lower=True,

                      split=" ",

                      char_level=False)

# print(train_apis)

# 通过训练和测试数据集丰富取词器的字典，方便后续操作

tokenizer.fit_on_texts(train_apis)

# print(train_apis)

# print(test_apis)

tokenizer.fit_on_texts(test_apis)

# print(test_apis)

# print(tokenizer.word_index)

# #获取目前提取词的字典信息

# # vocal = tokenizer.word_index

train_apis = tokenizer.texts_to_sequences(train_apis)

# 通过字典信息将字符转换为对应的数字

test_apis = tokenizer.texts_to_sequences(test_apis)

# print(test_apis)

# 序列化原数组为没有逗号的数组，默认在前面填充,默认截断前面的

train_apis = pad_sequences(train_apis, inputLen, padding='post', truncating='post')

# print(test_apis)

test_apis = pad_sequences(test_apis, inputLen, padding='post', truncating='post')

# print(test_apis)

def SequenceModel():

    # Sequential()是序列模型，其实是堆叠模型，可以在它上面堆砌网络形成一个复杂的网络结构

    model = Sequential()

    model.add(Dense(32, activation='relu', input_dim=6000))

    model.add(Dense(8, activation='softmax'))

    return model

def lstm():

    my_inpuy = Input(shape=(6000,), dtype='float64')

    # 在网络第一层，起降维的作用

    emb = Embedding(len(tokenizer.word_index) + 1, 5, input_length=6000)

    emb = emb(my_inpuy)

    net = Conv1D(16, 3, padding='same', kernel_initializer='glorot_uniform')(emb)

    net = BatchNormalization()(net)

    net = Activation('relu')(net)

    net = Conv1D(32, 3, padding='same', kernel_initializer='glorot_uniform')(net)

    net = BatchNormalization()(net)

    net = Activation('relu')(net)

    net = MaxPool1D(pool_size=4)(net)

    net1 = Conv1D(16, 4, padding='same', kernel_initializer='glorot_uniform')(emb)

    net1 = BatchNormalization()(net1)

    net1 = Activation('relu')(net1)

    net1 = Conv1D(32, 4, padding='same', kernel_initializer='glorot_uniform')(net1)

    net1 = BatchNormalization()(net1)

    net1 = Activation('relu')(net1)

    net1 = MaxPool1D(pool_size=4)(net1)

    net2 = Conv1D(16, 5, padding='same', kernel_initializer='glorot_uniform')(emb)

    net2 = BatchNormalization()(net2)

    net2 = Activation('relu')(net2)

    net2 = Conv1D(32, 5, padding='same', kernel_initializer='glorot_uniform')(net2)

    net2 = BatchNormalization()(net2)

    net2 = Activation('relu')(net2)

    net2 = MaxPool1D(pool_size=4)(net2)

    net = concatenate([net, net1, net2], axis=-1)

    net = CuDNNLSTM(256)(net)

    net = Dense(8, activation='softmax')(net)

    model = Model(inputs=my_inpuy, outputs=net)

    return model

def textcnn():

    kernel_size = [1, 3, 3, 5, 5]

    acti = 'relu'

    # 可看做一个文件的api集为一句话，然后话中的词总量是6000

    my_input = Input(shape=(inputLen,), dtype='int32')

    emb = Embedding(len(tokenizer.word_index) + 1, 20, input_length=inputLen)(my_input)

    emb = SpatialDropout1D(0.2)(emb)

    net = []

    for kernel in kernel_size:

        # 32个卷积核

        con = Conv1D(32, kernel, activation=acti, padding="same")(emb)

        # 滑动窗口大小是2,默认输出最后一维是通道数

        con = MaxPool1D(2)(con)

        net.append(con)

    # print(net)

    # input()

    net = concatenate(net, axis=-1)

    # net = concatenate(net)

    # print(net)

    # input()

    net = Flatten()(net)

    net = Dropout(0.5)(net)

    net = Dense(256, activation='relu')(net)

    net = Dropout(0.5)(net)

    net = Dense(8, activation='softmax')(net)

    model = Model(inputs=my_input, outputs=net)

    return model

test_result = np.zeros(shape=(len(test_apis),8))

# print(train_apis.shape)

# print(train_labels.shape)

# 5折交叉验证，将训练集切分成训练和验证集

skf = StratifiedKFold(n_splits=5)

for i, (train_index, valid_index) in enumerate(skf.split(train_apis, train_labels)):

    # print(i)

    # model = SequenceModel()

    model = textcnn()

    # metrics默认只有loss，加accuracy后在model.evaluate(...)的返回值即有accuracy结果

    model.compile(optimizer='adam', loss='sparse_categorical_crossentropy', metrics=['accuracy'])

    #模型保存规则

    model_save_path = './my_model/my_model_{}.h5'.format(str(i))

    checkpoint = ModelCheckpoint(model_save_path, save_best_only=True, save_weights_only=True)

    #早停规则

    earlystop = EarlyStopping(monitor='val_loss', min_delta=0, patience=5, verbose=0, mode='min', baseline=None,

                            restore_best_weights=True)

    #训练的过程会保存模型并早停

    model.fit(train_apis[train_index], train_labels[train_index], epochs=100, batch_size=1000,

              validation_data=(train_apis[valid_index], train_labels[valid_index]), callbacks=[checkpoint, earlystop])

    model.load_weights(model_save_path)

    # print(train_index, valid_index)

    test_tmpapis = model.predict(test_apis)

    test_result = test_result + test_tmpapis

# loss, acc = model.evaluate(train_apis, train_labels)

# print(loss)

# print(acc)

# print(model.predict(train_apis))

# print(test_files)

# print(test_apis)

test_result = test_result/5.0

with open(my_result, 'wb') as f:

    pickle.dump(test_files, f)

    pickle.dump(test_result, f)

# print(len(test_files))

# print(len(test_apis))

result = []

for i in range(len(test_files)):

    # #     print(test_files[i])

    #     #之前test_apis不带逗号的格式是矩阵格式，现在tolist转为带逗号的列表格式

    #     print(test_apis[i])

    #     print(test_apis[i].tolist())

    #     result.append(test_files[i])

    #     result.append(test_apis[i])

    tmp = []

    a = test_result[i].tolist()

    tmp.append(test_files[i])

    # extend相比于append可以添加多个值

    tmp.extend(a)

    #     print(tmp)

    result.append(tmp)

# print(1)

# print(result)

with open(my_result_csv, 'w') as f:

    #     f.write([1,2,3])

    result_csv = csv.writer(f)

    result_csv.writerow(["file_id", "prob0", "prob1", "prob2", "prob3", "prob4", "prob5", "prob6", "prob7"])

    result_csv.writerows(result)

可知，增加了早停机制后，约20代程序就被截止，valid不饱和。改进方案呢？

（1）看网络架构

卷积核变小、
层数变多、
去掉spatialdropout、
maxpool变meanpool，掺杂使用
注意初始化使用xavier
（2）数据量增大（小华说的分批次读取数据）
（3）放松早停机制限制条件，使训练较饱和
（4）单模型融合（不同学习率到达的不同局部最优结果汇总做融合）
（5）

尝试参考网上的，前向填充，这个影响大吗？

（6）学习搞xgboost分类器
 
 

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