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Neural Network In Python – Part VIII

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In the previous installment, the author discussed Importing the dataset.

Preparing the dataset

dataset[‘H-L’] = dataset[‘High’] – dataset[‘Low’]
dataset[‘O-C’] = dataset[‘Close’] – dataset[‘Open’]
dataset[‘3day MA’] = dataset[‘Close’].shift(1).rolling(window = 3).mean()
dataset[’10day MA’] = dataset[‘Close’].shift(1).rolling(window = 10).mean()
dataset[’30day MA’] = dataset[‘Close’].shift(1).rolling(window = 30).mean()
dataset[‘Std_dev’]= dataset[‘Close’].rolling(5).std()
dataset[‘RSI’] = talib.RSI(dataset[‘Close’].values, timeperiod = 9)
dataset[‘Williams %R’] = talib.WILLR(dataset[‘High’].values, dataset[‘Low’].values, dataset[‘Close’].values, 7)

We then prepare the various input features which will be used by the artificial neural network learning for making the predictions. We define the following input features:

  • High minus Low price
  • Close minus Open price
  • Three day moving average
  • Ten day moving average
  • 30 day moving average
  • Standard deviation for a period of 5 days
  • Relative Strength Index
  • Williams %R

dataset[‘Price_Rise’] = np.where(dataset[‘Close’].shift(-1) > dataset[‘Close’], 1, 0)

We then define the output value as price rise, which is a binary variable storing 1 when the closing price of tomorrow is greater than the closing price of today.

dataset = dataset.dropna()

Next, we drop all the rows storing NaN values by using the dropna() function.

X = dataset.iloc[:, 4:-1]
y = dataset.iloc[:, -1]

We then create two data frames storing the input and the output variables. The dataframe ‘X’ stores the input features, the columns starting from the fifth column (or index 4) of the dataset till the second last column. The last column will be stored in the dataframe y, which is the value we want to predict, i.e. the price rise.

Splitting the dataset

split = int(len(dataset)*0.8)
X_train, X_test, y_train, y_test = X[:split], X[split:], y[:split], y[split:]

In this part of the code, we will split our input and output variables to create the test and train datasets. This is done by creating a variable called split, which is defined to be the integer value of 0.8 times the length of the dataset.

We then slice the X and y variables into four separate data frames: Xtrain, Xtest, ytrain and ytest. This is an essential part of any machine learning algorithm, the training data is used by the model to arrive at the weights of the model. The test dataset is used to see how the model will perform on new data which would be fed into the model. The test dataset also has the actual value for the output, which helps us in understanding how efficient the model is. We will look at the confusion matrix later in the code, which essentially is a measure of how accurate the predictions made by the model are.

In the next installment, the author will demonstrate how Feature Scaling

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