tensorflow实战学习笔记5:循环神经网络相关概念以及Embedding编码,股价预测,LSTM,GRU,RNN

  • 目录

    循环核概念​

     tensorflow中实现RNN的相关函数以及其参数

    ​ RNN中X_train的维度

    RNN计算过程 

    一个小问题:为什么要用np.array?

  • 用RNN实现,输入一个字母,预测下一个字母

    RNN实现采用输入多个字母,预测一个字母

    Embedding编码

    采用Embedding编码用RNN实现输入一个字母来预测一个字母

    采用RNN Embedding编码实现输入4个字母,输出一个字母

    RNN实现股票预测

    用LSTM实现股价预测

    用GRU实现股价预测


循环核概念tensorflow实战学习笔记5:循环神经网络相关概念以及Embedding编码,股价预测,LSTM,GRU,RNN_第1张图片

 tensorflow中实现RNN的相关函数以及其参数

tensorflow实战学习笔记5:循环神经网络相关概念以及Embedding编码,股价预测,LSTM,GRU,RNN_第2张图片 RNN中X_train的维度

tensorflow实战学习笔记5:循环神经网络相关概念以及Embedding编码,股价预测,LSTM,GRU,RNN_第3张图片

RNN计算过程 

tensorflow实战学习笔记5:循环神经网络相关概念以及Embedding编码,股价预测,LSTM,GRU,RNN_第4张图片

一个小问题:为什么要用np.array?

为什么要用numpy

    Python中提供了list容器,可以当作数组使用。但列表中的元素可以是任何对象,因此列表中保存的是对象的指针,这样一来,为了保存一个简单的列表[1,2,3]。就需要三个指针和三个整数对象。对于数值运算来说,这种结构显然不够高效。
    Python虽然也提供了array模块,但其只支持一维数组,不支持多维数组(在TensorFlow里面偏向于矩阵理解),也没有各种运算函数。因而不适合数值运算。
    NumPy的出现弥补了这些不足。

(——摘自张若愚的《Python科学计算》)
 

例子:用RNN实现,输入一个字母,预测下一个字母

  

import numpy as np
import tensorflow as tf
from tensorflow.keras.layers import Dense, SimpleRNN
import matplotlib.pyplot as plt
import os

input_word = "abcde"
w_to_id = {'a': 0, 'b': 1, 'c': 2, 'd': 3, 'e': 4}  # 单词映射到数值id的词典
id_to_onehot = {0: [1., 0., 0., 0., 0.], 1: [0., 1., 0., 0., 0.], 2: [0., 0., 1., 0., 0.], 3: [0., 0., 0., 1., 0.],
                4: [0., 0., 0., 0., 1.]}  # id编码为one-hot

x_train = [id_to_onehot[w_to_id['a']], id_to_onehot[w_to_id['b']], id_to_onehot[w_to_id['c']],
           id_to_onehot[w_to_id['d']], id_to_onehot[w_to_id['e']]]
y_train = [w_to_id['b'], w_to_id['c'], w_to_id['d'], w_to_id['e'], w_to_id['a']]

np.random.seed(7)
np.random.shuffle(x_train)
np.random.seed(7)
np.random.shuffle(y_train)
tf.random.set_seed(7)

# 使x_train符合SimpleRNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]。
# 此处整个数据集送入,送入样本数为len(x_train);输入1个字母出结果,循环核时间展开步数为1; 表示为独热码有5个输入特征,每个时间步输入特征个数为5
x_train = np.reshape(x_train, (len(x_train), 1, 5))
y_train = np.array(y_train)

model = tf.keras.Sequential([
    SimpleRNN(3),
    Dense(5, activation='softmax')
])

model.compile(optimizer=tf.keras.optimizers.Adam(0.05),
              loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=False),
              metrics=['sparse_categorical_accuracy'])

checkpoint_save_path = "./checkpoint/rnn_onehot_1pre1.ckpt"

if os.path.exists(checkpoint_save_path + '.index'):
    print('-------------load the model-----------------')
    model.load_weights(checkpoint_save_path)

cp_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_save_path,
                                                 save_weights_only=True,
                                                 save_best_only=True,
                                                 monitor='loss')  # 由于fit没有给出测试集,不计算测试集准确率,根据loss,保存最优模型

history = model.fit(x_train, y_train, batch_size=32, epochs=100, callbacks=[cp_callback])

model.summary()

# print(model.trainable_variables)
file = open('./weights.txt', 'w')  # 参数提取
for v in model.trainable_variables:
    file.write(str(v.name) + '\n')
    file.write(str(v.shape) + '\n')
    file.write(str(v.numpy()) + '\n')
file.close()

###############################################    show   ###############################################

# 显示训练集和验证集的acc和loss曲线
acc = history.history['sparse_categorical_accuracy']
loss = history.history['loss']

plt.subplot(1, 2, 1)
plt.plot(acc, label='Training Accuracy')
plt.title('Training Accuracy')
plt.legend()

plt.subplot(1, 2, 2)
plt.plot(loss, label='Training Loss')
plt.title('Training Loss')
plt.legend()
plt.show()

############### predict #############

preNum = int(input("input the number of test alphabet:"))
for i in range(preNum):
    alphabet1 = input("input test alphabet:")
    alphabet = [id_to_onehot[w_to_id[alphabet1]]]
    # 使alphabet符合SimpleRNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]。此处验证效果送入了1个样本,送入样本数为1;输入1个字母出结果,所以循环核时间展开步数为1; 表示为独热码有5个输入特征,每个时间步输入特征个数为5
    alphabet = np.reshape(alphabet, (1, 1, 5))
    result = model.predict([alphabet])
    pred = tf.argmax(result, axis=1)
    pred = int(pred)
    tf.print(alphabet1 + '->' + input_word[pred])

RNN实现采用输入多个字母,预测一个字母

import numpy as np
import tensorflow as tf
from tensorflow.keras.layers import Dense, SimpleRNN
import matplotlib.pyplot as plt
import os

input_word = "abcde"
w_to_id = {'a': 0, 'b': 1, 'c': 2, 'd': 3, 'e': 4}  # 单词映射到数值id的词典
id_to_onehot = {0: [1., 0., 0., 0., 0.], 1: [0., 1., 0., 0., 0.], 2: [0., 0., 1., 0., 0.], 3: [0., 0., 0., 1., 0.],
                4: [0., 0., 0., 0., 1.]}  # id编码为one-hot

x_train = [
    [id_to_onehot[w_to_id['a']], id_to_onehot[w_to_id['b']], id_to_onehot[w_to_id['c']], id_to_onehot[w_to_id['d']]],
    [id_to_onehot[w_to_id['b']], id_to_onehot[w_to_id['c']], id_to_onehot[w_to_id['d']], id_to_onehot[w_to_id['e']]],
    [id_to_onehot[w_to_id['c']], id_to_onehot[w_to_id['d']], id_to_onehot[w_to_id['e']], id_to_onehot[w_to_id['a']]],
    [id_to_onehot[w_to_id['d']], id_to_onehot[w_to_id['e']], id_to_onehot[w_to_id['a']], id_to_onehot[w_to_id['b']]],
    [id_to_onehot[w_to_id['e']], id_to_onehot[w_to_id['a']], id_to_onehot[w_to_id['b']], id_to_onehot[w_to_id['c']]],
]
y_train = [w_to_id['e'], w_to_id['a'], w_to_id['b'], w_to_id['c'], w_to_id['d']]

np.random.seed(7)
np.random.shuffle(x_train)
np.random.seed(7)
np.random.shuffle(y_train)
tf.random.set_seed(7)

# 使x_train符合SimpleRNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]。
# 此处整个数据集送入,送入样本数为len(x_train);输入4个字母出结果,循环核时间展开步数为4; 表示为独热码有5个输入特征,每个时间步输入特征个数为5
x_train = np.reshape(x_train, (len(x_train), 4, 5))
y_train = np.array(y_train)

model = tf.keras.Sequential([
    SimpleRNN(3),
    Dense(5, activation='softmax')
])

model.compile(optimizer=tf.keras.optimizers.Adam(0.01),
              loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=False),
              metrics=['sparse_categorical_accuracy'])

checkpoint_save_path = "./checkpoint/rnn_onehot_4pre1.ckpt"

if os.path.exists(checkpoint_save_path + '.index'):
    print('-------------load the model-----------------')
    model.load_weights(checkpoint_save_path)

cp_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_save_path,
                                                 save_weights_only=True,
                                                 save_best_only=True,
                                                 monitor='loss')  # 由于fit没有给出测试集,不计算测试集准确率,根据loss,保存最优模型

history = model.fit(x_train, y_train, batch_size=32, epochs=100, callbacks=[cp_callback])

model.summary()

# print(model.trainable_variables)
file = open('./weights.txt', 'w')  # 参数提取
for v in model.trainable_variables:
    file.write(str(v.name) + '\n')
    file.write(str(v.shape) + '\n')
    file.write(str(v.numpy()) + '\n')
file.close()

###############################################    show   ###############################################

# 显示训练集和验证集的acc和loss曲线
acc = history.history['sparse_categorical_accuracy']
loss = history.history['loss']

plt.subplot(1, 2, 1)
plt.plot(acc, label='Training Accuracy')
plt.title('Training Accuracy')
plt.legend()

plt.subplot(1, 2, 2)
plt.plot(loss, label='Training Loss')
plt.title('Training Loss')
plt.legend()
plt.show()

############### predict #############

preNum = int(input("input the number of test alphabet:"))
for i in range(preNum):
    alphabet1 = input("input test alphabet:")
    alphabet = [id_to_onehot[w_to_id[a]] for a in alphabet1]
    # 使alphabet符合SimpleRNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]。此处验证效果送入了1个样本,送入样本数为1;输入4个字母出结果,所以循环核时间展开步数为4; 表示为独热码有5个输入特征,每个时间步输入特征个数为5
    alphabet = np.reshape(alphabet, (1, 4, 5))
    result = model.predict([alphabet])
    pred = tf.argmax(result, axis=1)
    pred = int(pred)
    tf.print(alphabet1 + '->' + input_word[pred])

Embedding编码

Embedding:一种编码方式

独热码:数据量大的时候过于稀疏,映射之间是独立的,没有表现出关联性。

Embedding:是一种单词编码方法,用低维向量实现了编码,这种编码通过神经网络训练优化,能表达出单词间的相关性。

在tensorflow中用tf.keras.layers.Embedding(词汇表大小,编码维度)

编码维度就是用来表达单词的数字的个数

例:tf.keras.layers.Embedding(100,3)     代表对100个数如1-100进行编码,[4]编码为[0.25,0.1,0.11]

在用Embedding进行编码时,x_train的维度[送入样本数,循环核时间展开步数]

 

采用Embedding编码用RNN实现输入一个字母来预测一个字母

import numpy as np
import tensorflow as tf
from tensorflow.keras.layers import Dense, SimpleRNN, Embedding
import matplotlib.pyplot as plt
import os

input_word = "abcde"
w_to_id = {'a': 0, 'b': 1, 'c': 2, 'd': 3, 'e': 4}  # 单词映射到数值id的词典

x_train = [w_to_id['a'], w_to_id['b'], w_to_id['c'], w_to_id['d'], w_to_id['e']]
y_train = [w_to_id['b'], w_to_id['c'], w_to_id['d'], w_to_id['e'], w_to_id['a']]

np.random.seed(7)
np.random.shuffle(x_train)
np.random.seed(7)
np.random.shuffle(y_train)
tf.random.set_seed(7)

# 使x_train符合Embedding输入要求:[送入样本数, 循环核时间展开步数] ,
# 此处整个数据集送入所以送入,送入样本数为len(x_train);输入1个字母出结果,循环核时间展开步数为1。
x_train = np.reshape(x_train, (len(x_train), 1))
y_train = np.array(y_train)

model = tf.keras.Sequential([
    Embedding(5, 2),
    SimpleRNN(3),
    Dense(5, activation='softmax')
])

model.compile(optimizer=tf.keras.optimizers.Adam(0.01),
              loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=False),
              metrics=['sparse_categorical_accuracy'])

checkpoint_save_path = "./checkpoint/run_embedding_1pre1.ckpt"

if os.path.exists(checkpoint_save_path + '.index'):
    print('-------------load the model-----------------')
    model.load_weights(checkpoint_save_path)

cp_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_save_path,
                                                 save_weights_only=True,
                                                 save_best_only=True,
                                                 monitor='loss')  # 由于fit没有给出测试集,不计算测试集准确率,根据loss,保存最优模型

history = model.fit(x_train, y_train, batch_size=32, epochs=100, callbacks=[cp_callback])

model.summary()

# print(model.trainable_variables)
file = open('./weights.txt', 'w')  # 参数提取
for v in model.trainable_variables:
    file.write(str(v.name) + '\n')
    file.write(str(v.shape) + '\n')
    file.write(str(v.numpy()) + '\n')
file.close()

###############################################    show   ###############################################

# 显示训练集和验证集的acc和loss曲线
acc = history.history['sparse_categorical_accuracy']
loss = history.history['loss']

plt.subplot(1, 2, 1)
plt.plot(acc, label='Training Accuracy')
plt.title('Training Accuracy')
plt.legend()

plt.subplot(1, 2, 2)
plt.plot(loss, label='Training Loss')
plt.title('Training Loss')
plt.legend()
plt.show()

############### predict #############

preNum = int(input("input the number of test alphabet:"))
for i in range(preNum):
    alphabet1 = input("input test alphabet:")
    alphabet = [w_to_id[alphabet1]]
    # 使alphabet符合Embedding输入要求:[送入样本数, 循环核时间展开步数]。
    # 此处验证效果送入了1个样本,送入样本数为1;输入1个字母出结果,循环核时间展开步数为1。
    alphabet = np.reshape(alphabet, (1, 1))
    result = model.predict(alphabet)
    pred = tf.argmax(result, axis=1)
    pred = int(pred)
    tf.print(alphabet1 + '->' + input_word[pred])

 

采用RNN Embedding编码实现输入4个字母,输出一个字母

import numpy as np
import tensorflow as tf
from tensorflow.keras.layers import Dense, SimpleRNN, Embedding
import matplotlib.pyplot as plt
import os

input_word = "abcdefghijklmnopqrstuvwxyz"
w_to_id = {'a': 0, 'b': 1, 'c': 2, 'd': 3, 'e': 4,
           'f': 5, 'g': 6, 'h': 7, 'i': 8, 'j': 9,
           'k': 10, 'l': 11, 'm': 12, 'n': 13, 'o': 14,
           'p': 15, 'q': 16, 'r': 17, 's': 18, 't': 19,
           'u': 20, 'v': 21, 'w': 22, 'x': 23, 'y': 24, 'z': 25}  # 单词映射到数值id的词典

training_set_scaled = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
                       11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
                       21, 22, 23, 24, 25]

x_train = []
y_train = []

for i in range(4, 26):
    x_train.append(training_set_scaled[i - 4:i])
    y_train.append(training_set_scaled[i])

np.random.seed(7)
np.random.shuffle(x_train)
np.random.seed(7)
np.random.shuffle(y_train)
tf.random.set_seed(7)

# 使x_train符合Embedding输入要求:[送入样本数, 循环核时间展开步数] ,
# 此处整个数据集送入所以送入,送入样本数为len(x_train);输入4个字母出结果,循环核时间展开步数为4。
x_train = np.reshape(x_train, (len(x_train), 4))
y_train = np.array(y_train)

model = tf.keras.Sequential([
    Embedding(26, 2),
    SimpleRNN(10),
    Dense(26, activation='softmax')
])

model.compile(optimizer=tf.keras.optimizers.Adam(0.01),
              loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=False),
              metrics=['sparse_categorical_accuracy'])

checkpoint_save_path = "./checkpoint/rnn_embedding_4pre1.ckpt"

if os.path.exists(checkpoint_save_path + '.index'):
    print('-------------load the model-----------------')
    model.load_weights(checkpoint_save_path)

cp_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_save_path,
                                                 save_weights_only=True,
                                                 save_best_only=True,
                                                 monitor='loss')  # 由于fit没有给出测试集,不计算测试集准确率,根据loss,保存最优模型

history = model.fit(x_train, y_train, batch_size=32, epochs=100, callbacks=[cp_callback])

model.summary()

file = open('./weights.txt', 'w')  # 参数提取
for v in model.trainable_variables:
    file.write(str(v.name) + '\n')
    file.write(str(v.shape) + '\n')
    file.write(str(v.numpy()) + '\n')
file.close()

###############################################    show   ###############################################

# 显示训练集和验证集的acc和loss曲线
acc = history.history['sparse_categorical_accuracy']
loss = history.history['loss']

plt.subplot(1, 2, 1)
plt.plot(acc, label='Training Accuracy')
plt.title('Training Accuracy')
plt.legend()

plt.subplot(1, 2, 2)
plt.plot(loss, label='Training Loss')
plt.title('Training Loss')
plt.legend()
plt.show()

################# predict ##################

preNum = int(input("input the number of test alphabet:"))
for i in range(preNum):
    alphabet1 = input("input test alphabet:")
    alphabet = [w_to_id[a] for a in alphabet1]
    # 使alphabet符合Embedding输入要求:[送入样本数, 时间展开步数]。
    # 此处验证效果送入了1个样本,送入样本数为1;输入4个字母出结果,循环核时间展开步数为4。
    alphabet = np.reshape(alphabet, (1, 4))
    result = model.predict([alphabet])
    pred = tf.argmax(result, axis=1)
    pred = int(pred)
    tf.print(alphabet1 + '->' + input_word[pred])

 

RNN实现股票预测

import numpy as np
import tensorflow as tf
from tensorflow.keras.layers import Dropout, Dense, SimpleRNN
import matplotlib.pyplot as plt
import os
import pandas as pd
from sklearn.preprocessing import MinMaxScaler
from sklearn.metrics import mean_squared_error, mean_absolute_error
import math

maotai = pd.read_csv('./SH600519.csv')  # 读取股票文件

training_set = maotai.iloc[0:2426 - 300, 2:3].values  # 前(2426-300=2126)天的开盘价作为训练集,表格从0开始计数,2:3 是提取[2:3)列,前闭后开,故提取出C列开盘价
test_set = maotai.iloc[2426 - 300:, 2:3].values  # 后300天的开盘价作为测试集

# 归一化
sc = MinMaxScaler(feature_range=(0, 1))  # 定义归一化:归一化到(0,1)之间
training_set_scaled = sc.fit_transform(training_set)  # 求得训练集的最大值,最小值这些训练集固有的属性,并在训练集上进行归一化
test_set = sc.transform(test_set)  # 利用训练集的属性对测试集进行归一化

x_train = []
y_train = []

x_test = []
y_test = []

# 测试集:csv表格中前2426-300=2126天数据
# 利用for循环,遍历整个训练集,提取训练集中连续60天的开盘价作为输入特征x_train,第61天的数据作为标签,for循环共构建2426-300-60=2066组数据。
for i in range(60, len(training_set_scaled)):
    x_train.append(training_set_scaled[i - 60:i, 0])
    y_train.append(training_set_scaled[i, 0])
# 对训练集进行打乱
np.random.seed(7)
np.random.shuffle(x_train)
np.random.seed(7)
np.random.shuffle(y_train)
tf.random.set_seed(7)
# 将训练集由list格式变为array格式
x_train, y_train = np.array(x_train), np.array(y_train)

# 使x_train符合RNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]。
# 此处整个数据集送入,送入样本数为x_train.shape[0]即2066组数据;输入60个开盘价,预测出第61天的开盘价,循环核时间展开步数为60; 每个时间步送入的特征是某一天的开盘价,只有1个数据,故每个时间步输入特征个数为1
x_train = np.reshape(x_train, (x_train.shape[0], 60, 1))
# 测试集:csv表格中后300天数据
# 利用for循环,遍历整个测试集,提取测试集中连续60天的开盘价作为输入特征x_train,第61天的数据作为标签,for循环共构建300-60=240组数据。
for i in range(60, len(test_set)):
    x_test.append(test_set[i - 60:i, 0])
    y_test.append(test_set[i, 0])
# 测试集变array并reshape为符合RNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]
x_test, y_test = np.array(x_test), np.array(y_test)
x_test = np.reshape(x_test, (x_test.shape[0], 60, 1))

model = tf.keras.Sequential([
    SimpleRNN(80, return_sequences=True),
    Dropout(0.2),
    SimpleRNN(100),
    Dropout(0.2),
    Dense(1)
])

model.compile(optimizer=tf.keras.optimizers.Adam(0.001),
              loss='mean_squared_error')  # 损失函数用均方误差
# 该应用只观测loss数值,不观测准确率,所以删去metrics选项,一会在每个epoch迭代显示时只显示loss值

checkpoint_save_path = "./checkpoint/rnn_stock.ckpt"

if os.path.exists(checkpoint_save_path + '.index'):
    print('-------------load the model-----------------')
    model.load_weights(checkpoint_save_path)

cp_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_save_path,
                                                 save_weights_only=True,
                                                 save_best_only=True,
                                                 monitor='val_loss')

history = model.fit(x_train, y_train, batch_size=64, epochs=50, validation_data=(x_test, y_test), validation_freq=1,
                    callbacks=[cp_callback])

model.summary()

file = open('./weights.txt', 'w')  # 参数提取
for v in model.trainable_variables:
    file.write(str(v.name) + '\n')
    file.write(str(v.shape) + '\n')
    file.write(str(v.numpy()) + '\n')
file.close()

loss = history.history['loss']
val_loss = history.history['val_loss']

plt.plot(loss, label='Training Loss')
plt.plot(val_loss, label='Validation Loss')
plt.title('Training and Validation Loss')
plt.legend()
plt.show()

################## predict ######################
# 测试集输入模型进行预测
predicted_stock_price = model.predict(x_test)
# 对预测数据还原---从(0,1)反归一化到原始范围
predicted_stock_price = sc.inverse_transform(predicted_stock_price)
# 对真实数据还原---从(0,1)反归一化到原始范围
real_stock_price = sc.inverse_transform(test_set[60:])
# 画出真实数据和预测数据的对比曲线
plt.plot(real_stock_price, color='red', label='MaoTai Stock Price')
plt.plot(predicted_stock_price, color='blue', label='Predicted MaoTai Stock Price')
plt.title('MaoTai Stock Price Prediction')
plt.xlabel('Time')
plt.ylabel('MaoTai Stock Price')
plt.legend()
plt.show()

##########evaluate##############
# calculate MSE 均方误差 ---> E[(预测值-真实值)^2] (预测值减真实值求平方后求均值)
mse = mean_squared_error(predicted_stock_price, real_stock_price)
# calculate RMSE 均方根误差--->sqrt[MSE]    (对均方误差开方)
rmse = math.sqrt(mean_squared_error(predicted_stock_price, real_stock_price))
# calculate MAE 平均绝对误差----->E[|预测值-真实值|](预测值减真实值求绝对值后求均值)
mae = mean_absolute_error(predicted_stock_price, real_stock_price)
print('均方误差: %.6f' % mse)
print('均方根误差: %.6f' % rmse)
print('平均绝对误差: %.6f' % mae)

用LSTM实现股价预测

 

import numpy as np
import tensorflow as tf
from tensorflow.keras.layers import Dropout, Dense, LSTM
import matplotlib.pyplot as plt
import os
import pandas as pd
from sklearn.preprocessing import MinMaxScaler
from sklearn.metrics import mean_squared_error, mean_absolute_error
import math

maotai = pd.read_csv('./SH600519.csv')  # 读取股票文件

training_set = maotai.iloc[0:2426 - 300, 2:3].values  # 前(2426-300=2126)天的开盘价作为训练集,表格从0开始计数,2:3 是提取[2:3)列,前闭后开,故提取出C列开盘价
test_set = maotai.iloc[2426 - 300:, 2:3].values  # 后300天的开盘价作为测试集

# 归一化
sc = MinMaxScaler(feature_range=(0, 1))  # 定义归一化:归一化到(0,1)之间
training_set_scaled = sc.fit_transform(training_set)  # 求得训练集的最大值,最小值这些训练集固有的属性,并在训练集上进行归一化
test_set = sc.transform(test_set)  # 利用训练集的属性对测试集进行归一化

x_train = []
y_train = []

x_test = []
y_test = []

# 测试集:csv表格中前2426-300=2126天数据
# 利用for循环,遍历整个训练集,提取训练集中连续60天的开盘价作为输入特征x_train,第61天的数据作为标签,for循环共构建2426-300-60=2066组数据。
for i in range(60, len(training_set_scaled)):
    x_train.append(training_set_scaled[i - 60:i, 0])
    y_train.append(training_set_scaled[i, 0])
# 对训练集进行打乱
np.random.seed(7)
np.random.shuffle(x_train)
np.random.seed(7)
np.random.shuffle(y_train)
tf.random.set_seed(7)
# 将训练集由list格式变为array格式
x_train, y_train = np.array(x_train), np.array(y_train)

# 使x_train符合RNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]。
# 此处整个数据集送入,送入样本数为x_train.shape[0]即2066组数据;输入60个开盘价,预测出第61天的开盘价,循环核时间展开步数为60; 每个时间步送入的特征是某一天的开盘价,只有1个数据,故每个时间步输入特征个数为1
x_train = np.reshape(x_train, (x_train.shape[0], 60, 1))
# 测试集:csv表格中后300天数据
# 利用for循环,遍历整个测试集,提取测试集中连续60天的开盘价作为输入特征x_train,第61天的数据作为标签,for循环共构建300-60=240组数据。
for i in range(60, len(test_set)):
    x_test.append(test_set[i - 60:i, 0])
    y_test.append(test_set[i, 0])
# 测试集变array并reshape为符合RNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]
x_test, y_test = np.array(x_test), np.array(y_test)
x_test = np.reshape(x_test, (x_test.shape[0], 60, 1))

model = tf.keras.Sequential([
    LSTM(80, return_sequences=True),
    Dropout(0.2),
    LSTM(100),
    Dropout(0.2),
    Dense(1)
])

model.compile(optimizer=tf.keras.optimizers.Adam(0.001),
              loss='mean_squared_error')  # 损失函数用均方误差
# 该应用只观测loss数值,不观测准确率,所以删去metrics选项,一会在每个epoch迭代显示时只显示loss值

checkpoint_save_path = "./checkpoint/LSTM_stock.ckpt"

if os.path.exists(checkpoint_save_path + '.index'):
    print('-------------load the model-----------------')
    model.load_weights(checkpoint_save_path)

cp_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_save_path,
                                                 save_weights_only=True,
                                                 save_best_only=True,
                                                 monitor='val_loss')

history = model.fit(x_train, y_train, batch_size=64, epochs=50, validation_data=(x_test, y_test), validation_freq=1,
                    callbacks=[cp_callback])

model.summary()

file = open('./weights.txt', 'w')  # 参数提取
for v in model.trainable_variables:
    file.write(str(v.name) + '\n')
    file.write(str(v.shape) + '\n')
    file.write(str(v.numpy()) + '\n')
file.close()

loss = history.history['loss']
val_loss = history.history['val_loss']

plt.plot(loss, label='Training Loss')
plt.plot(val_loss, label='Validation Loss')
plt.title('Training and Validation Loss')
plt.legend()
plt.show()

################## predict ######################
# 测试集输入模型进行预测
predicted_stock_price = model.predict(x_test)
# 对预测数据还原---从(0,1)反归一化到原始范围
predicted_stock_price = sc.inverse_transform(predicted_stock_price)
# 对真实数据还原---从(0,1)反归一化到原始范围
real_stock_price = sc.inverse_transform(test_set[60:])
# 画出真实数据和预测数据的对比曲线
plt.plot(real_stock_price, color='red', label='MaoTai Stock Price')
plt.plot(predicted_stock_price, color='blue', label='Predicted MaoTai Stock Price')
plt.title('MaoTai Stock Price Prediction')
plt.xlabel('Time')
plt.ylabel('MaoTai Stock Price')
plt.legend()
plt.show()

##########evaluate##############
# calculate MSE 均方误差 ---> E[(预测值-真实值)^2] (预测值减真实值求平方后求均值)
mse = mean_squared_error(predicted_stock_price, real_stock_price)
# calculate RMSE 均方根误差--->sqrt[MSE]    (对均方误差开方)
rmse = math.sqrt(mean_squared_error(predicted_stock_price, real_stock_price))
# calculate MAE 平均绝对误差----->E[|预测值-真实值|](预测值减真实值求绝对值后求均值)
mae = mean_absolute_error(predicted_stock_price, real_stock_price)
print('均方误差: %.6f' % mse)
print('均方根误差: %.6f' % rmse)
print('平均绝对误差: %.6f' % mae)

用GRU实现股价预测

import numpy as np
import tensorflow as tf
from tensorflow.keras.layers import Dropout, Dense, GRU
import matplotlib.pyplot as plt
import os
import pandas as pd
from sklearn.preprocessing import MinMaxScaler
from sklearn.metrics import mean_squared_error, mean_absolute_error
import math

maotai = pd.read_csv('./SH600519.csv')  # 读取股票文件

training_set = maotai.iloc[0:2426 - 300, 2:3].values  # 前(2426-300=2126)天的开盘价作为训练集,表格从0开始计数,2:3 是提取[2:3)列,前闭后开,故提取出C列开盘价
test_set = maotai.iloc[2426 - 300:, 2:3].values  # 后300天的开盘价作为测试集

# 归一化
sc = MinMaxScaler(feature_range=(0, 1))  # 定义归一化:归一化到(0,1)之间
training_set_scaled = sc.fit_transform(training_set)  # 求得训练集的最大值,最小值这些训练集固有的属性,并在训练集上进行归一化
test_set = sc.transform(test_set)  # 利用训练集的属性对测试集进行归一化

x_train = []
y_train = []

x_test = []
y_test = []

# 测试集:csv表格中前2426-300=2126天数据
# 利用for循环,遍历整个训练集,提取训练集中连续60天的开盘价作为输入特征x_train,第61天的数据作为标签,for循环共构建2426-300-60=2066组数据。
for i in range(60, len(training_set_scaled)):
    x_train.append(training_set_scaled[i - 60:i, 0])
    y_train.append(training_set_scaled[i, 0])
# 对训练集进行打乱
np.random.seed(7)
np.random.shuffle(x_train)
np.random.seed(7)
np.random.shuffle(y_train)
tf.random.set_seed(7)
# 将训练集由list格式变为array格式
x_train, y_train = np.array(x_train), np.array(y_train)

# 使x_train符合RNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]。
# 此处整个数据集送入,送入样本数为x_train.shape[0]即2066组数据;输入60个开盘价,预测出第61天的开盘价,循环核时间展开步数为60; 每个时间步送入的特征是某一天的开盘价,只有1个数据,故每个时间步输入特征个数为1
x_train = np.reshape(x_train, (x_train.shape[0], 60, 1))
# 测试集:csv表格中后300天数据
# 利用for循环,遍历整个测试集,提取测试集中连续60天的开盘价作为输入特征x_train,第61天的数据作为标签,for循环共构建300-60=240组数据。
for i in range(60, len(test_set)):
    x_test.append(test_set[i - 60:i, 0])
    y_test.append(test_set[i, 0])
# 测试集变array并reshape为符合RNN输入要求:[送入样本数, 循环核时间展开步数, 每个时间步输入特征个数]
x_test, y_test = np.array(x_test), np.array(y_test)
x_test = np.reshape(x_test, (x_test.shape[0], 60, 1))

model = tf.keras.Sequential([
    GRU(80, return_sequences=True),
    Dropout(0.2),
    GRU(100),
    Dropout(0.2),
    Dense(1)
])

model.compile(optimizer=tf.keras.optimizers.Adam(0.001),
              loss='mean_squared_error')  # 损失函数用均方误差
# 该应用只观测loss数值,不观测准确率,所以删去metrics选项,一会在每个epoch迭代显示时只显示loss值

checkpoint_save_path = "./checkpoint/stock.ckpt"

if os.path.exists(checkpoint_save_path + '.index'):
    print('-------------load the model-----------------')
    model.load_weights(checkpoint_save_path)

cp_callback = tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_save_path,
                                                 save_weights_only=True,
                                                 save_best_only=True,
                                                 monitor='val_loss')

history = model.fit(x_train, y_train, batch_size=64, epochs=50, validation_data=(x_test, y_test), validation_freq=1,
                    callbacks=[cp_callback])

model.summary()

file = open('./weights.txt', 'w')  # 参数提取
for v in model.trainable_variables:
    file.write(str(v.name) + '\n')
    file.write(str(v.shape) + '\n')
    file.write(str(v.numpy()) + '\n')
file.close()

loss = history.history['loss']
val_loss = history.history['val_loss']

plt.plot(loss, label='Training Loss')
plt.plot(val_loss, label='Validation Loss')
plt.title('Training and Validation Loss')
plt.legend()
plt.show()

################## predict ######################
# 测试集输入模型进行预测
predicted_stock_price = model.predict(x_test)
# 对预测数据还原---从(0,1)反归一化到原始范围
predicted_stock_price = sc.inverse_transform(predicted_stock_price)
# 对真实数据还原---从(0,1)反归一化到原始范围
real_stock_price = sc.inverse_transform(test_set[60:])
# 画出真实数据和预测数据的对比曲线
plt.plot(real_stock_price, color='red', label='MaoTai Stock Price')
plt.plot(predicted_stock_price, color='blue', label='Predicted MaoTai Stock Price')
plt.title('MaoTai Stock Price Prediction')
plt.xlabel('Time')
plt.ylabel('MaoTai Stock Price')
plt.legend()
plt.show()

##########evaluate##############
# calculate MSE 均方误差 ---> E[(预测值-真实值)^2] (预测值减真实值求平方后求均值)
mse = mean_squared_error(predicted_stock_price, real_stock_price)
# calculate RMSE 均方根误差--->sqrt[MSE]    (对均方误差开方)
rmse = math.sqrt(mean_squared_error(predicted_stock_price, real_stock_price))
# calculate MAE 平均绝对误差----->E[|预测值-真实值|](预测值减真实值求绝对值后求均值)
mae = mean_absolute_error(predicted_stock_price, real_stock_price)
print('均方误差: %.6f' % mse)
print('均方根误差: %.6f' % rmse)
print('平均绝对误差: %.6f' % mae)

以上学习笔记均来自北京大学曹健老师的慕课tensorflow实战

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