tushare实战LSTM实现黄金价格预测
拉取数据
老样子,之前tushare实战分析黄金与美元收益率关系的时候也是这样,注意: pro_api 中的东西是tushare的token
import tushare as ts
pro = ts.pro_api('xxx')
df = pro.fx_daily(**{
"ts_code": "XAUUSD.FXCM",
"trade_date": "",
"start_date": 20160910,
"end_date": 20210910,
"exchange": "FXCM",
"limit": "",
"offset": ""
}, fields=[
"ts_code",
"trade_date",
"bid_open",
"bid_close",
"bid_high",
"bid_low",
"ask_open",
"ask_close",
"ask_high",
"ask_low",
"tick_qty"
])
print(df)
df.set_index('trade_date',inplace=True)
df.to_csv('黄金数据2016-9-10至2021-9-10.csv')
数据预处理
LSTM模型的核心是用一个序列数据去预测未来的数据,序列数据的构造思路: 构造一个队列,将每日的数据视为一个个体,当后一个个体进入队列的时候,就会挤出队首的个体,然后在每个时刻都‘拍照’记录下队列的情况,就可以得到一个三维数据(len, men_day, attribute)其中len是序列的个数,假设数据集中有100条数据,我们将5天作为一个序列,那么就会有100-5+1=96个序列,men_day就是那个5天的5,表示序列的长度,attribute则是原数据的协变量(就是数据的特征);
了解了输入数据后,我们就要处理输出数据,假设我们想用截止到今天的数据去预测未来五天的价格,那么构造训练集的时候,就要将价格数据作为标签,向前shift5天;也就是在一条数据中,除了那些他原本就有的数据,还会多一个5天之后的价格。按照这个思路,写出数据预处理函数,其中deque表示的就是那个队列
mem_his_days就是序列的长度,pre_days就是预测未来几天的价格
def Stock_Price_LSTM_Data_Precesing(df,mem_his_days,pre_days):
df.dropna(inplace=True)
df.sort_index(inplace=True)
df.drop(columns='ts_code',inplace=True)
df['label'] = df['ask_open'].shift(-pre_days)
from sklearn.preprocessing import StandardScaler
scaler = StandardScaler()
sca_X = scaler.fit_transform(df.iloc[:,:-1])
from collections import deque
deq = deque(maxlen=mem_his_days)
X = []
for i in sca_X:
deq.append(list(i))
if len(deq)==mem_his_days:
X.append(list(deq))
X_lately = X[-pre_days:]
X = X[:-pre_days]
y = df['label'].values[mem_his_days-1:-pre_days]
import numpy as np
X = np.array(X)
y = np.array(y)
return X,y,X_lately
训练模型
终于到我们熟悉的调参环节,我调了好一会儿,最终选定的是mem_days、Lstm层数、隐藏层数、隐层神经元个数分别是5、3、2、64,朋友们也可以自己取调一调
pre_days = 5
mem_days = [5]
lstm_layers = [3]
dense_layers = [2]
units = [64]
from tensorflow.keras.callbacks import ModelCheckpoint
for the_mem_days in mem_days:
for the_lstm_layers in lstm_layers:
for the_dense_layers in dense_layers:
for the_units in units:
filepath = './models_only_problem/{val_mape:.2f}_{epoch:02d}_'+f'men_{the_mem_days}_lstm_{the_lstm_layers}_dense_{the_dense_layers}_unit_{the_units}'
checkpoint = ModelCheckpoint(
filepath=filepath,
save_weights_only=False,
monitor='val_mape',
mode='min',
save_best_only=True)
X,y,X_lately = Stock_Price_LSTM_Data_Precesing(golden,the_mem_days,pre_days)
from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X,y,shuffle=False,test_size=0.1)
from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import LSTM, Dense, Dropout
model = Sequential()
model.add(LSTM(the_units,input_shape=X.shape[1:],activation='relu',return_sequences=True))
model.add(Dropout(0.1))
for i in range(the_lstm_layers):
model.add(LSTM(the_units,activation='relu',return_sequences=True))
model.add(Dropout(0.1))
model.add(LSTM(the_units,activation='relu'))
model.add(Dropout(0.1))
for i in range(the_dense_layers):
model.add(Dense(the_units,activation='relu'))
model.add(Dropout(0.1))
model.add(Dense(1))
model.compile(optimizer='adam',
loss='mse',
metrics=['mape'])
model.fit(X_train,y_train,batch_size=32,epochs=50,validation_data=(X_test,y_test),callbacks=[checkpoint])
模型会被保存在models_only_problem文件夹下,第一个数值表示的就是预测的精度,越小越好,后面跟的就是那些超参数的值,只要找到前面数值最小的那些超参数的值,固定这些超参数即可,我的mape数值最小是1.66
模型预测及查看效果
将刚才训练好的最好的模型拿下来,加载模型,把需要预测的数据扔进去
先看整体情况
from tensorflow.keras.models import load_model
import matplotlib.pyplot as plt
best_model = load_model('./models_only_problem/1.66_28_men_5_lstm_3_dense_2_unit_64')
pre = best_model.predict(X)
print(len(pre))
plt.plot(y,color='red',label='price')
plt.plot(pre,color='green',label='predict')
plt.show()
选取特定的一小段查看
x_time1 = y[200:300]
pre_time1 = pre[200:300]
plt.plot(x_time1,color='red',label='price')
plt.plot(pre_time1,color='green',label='predict')
plt.legend()
plt.show()
结果分析
从总体上看,LSTM的拟合效果还是不错的,可是在一个较短的时间内,预测数据竟然滞后于实际价格,这有可能带来投资的偏差,一种可行的办法就是,在数据中加入更多的属性,数据的质量决定了最终神经网络预测的质量
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