Я купил эту модель с Нейронной сетью LSTM на кератах, используя данные ежедневного спроса
import numpy as np
import pandas as pd
from sklearn import preprocessing
from keras.layers.core import Dense, Dropout, Activation
from keras.activations import linear
from keras.layers.recurrent import LSTM
from keras.models import Sequential
from matplotlib import pyplot
#read and prepare data from datafile
data_file_name = "DailyDemand.csv"
data_csv = pd.read_csv(data_file_name, delimiter = ';',header=None, usecols=[1,2,3,4,5])
yt = data_csv[1:]
data = yt
data.columns = ['MoyenneTransactHier', 'MaxTransaction', 'MinTransaction','CountTransaction','Demand']
# print (data.head(10))
pd.options.display.float_format = '{:,.0f}'.format
data = data.dropna ()
y=data['Demand'].astype(int)
cols=['MoyenneTransactHier', 'MaxTransaction', 'MinTransaction','CountTransaction']
x=data[cols].astype(int)
#scaling data
scaler_x = preprocessing.MinMaxScaler(feature_range =(-1, 1))
x = np.array(x).reshape ((len(x),4 ))
x = scaler_x.fit_transform(x)
scaler_y = preprocessing.MinMaxScaler(feature_range =(-1, 1))
y = np.array(y).reshape ((len(y), 1))
y = scaler_y.fit_transform(y)
print("longeur de y",len(y))
# Split train and test data
train_end = 400
x_train=x[0: train_end ,]
x_test=x[train_end +1: ,]
y_train=y[0: train_end]
y_test=y[train_end +1:]
x_train=x_train.reshape(x_train.shape +(1,))
x_test=x_test.reshape(x_test.shape + (1,))
print("Data well prepared")
print ('x_train shape ', x_train.shape)
print ('y_train', y_train.shape)
#Design the model - LSTM Network
seed = 2016
np.random.seed(seed)
fit1 = Sequential ()
fit1.add(LSTM(
output_dim = 4,
activation='tanh',
input_shape =(4, 1)))
fit1.add(Dense(output_dim =1))
fit1.add(Activation(linear))
#rmsprop or sgd
batchsize = 1
fit1.compile(loss="mean_squared_error",optimizer="rmsprop")
#train the model
fit1.fit(x_train , y_train , batch_size = batchsize, nb_epoch =20, shuffle=True)
print(fit1.summary ())
#Model error
score_train = fit1.evaluate(x_train ,y_train ,batch_size =batchsize)
score_test = fit1.evaluate(x_test , y_test ,batch_size =batchsize)
print("in train MSE = ",round(score_train,4))
print("in test MSE = ",round(score_test ,4))
#Make prediction
pred1=fit1.predict(x_test)
pred1 = scaler_y.inverse_transform(np.array(pred1).reshape ((len(pred1), 1)))
real_test = scaler_y.inverse_transform(np.array(y_test).reshape ((len(y_test), 1))).astype(int)
#save prediction
testData = pd.DataFrame(real_test)
preddData = pd.DataFrame(pred1)
dataF = pd.concat([testData,preddData], axis=1)
dataF.columns =['Real demand','Predicted Demand']
dataF.to_csv('Demandprediction.csv')
pyplot.plot(pred1, label='Forecast')
pyplot.plot(real_test,label='Actual')
pyplot.legend()
pyplot.show()
И он генерирует этот результат:
После создания и обучения хорошей модели на имеющихся у меня исторических данных, я не знаю, как я могу определить прогноз будущих значений? например спрос на следующие 10 дней (данные ежедневно)?