There are variables X_train, X_test, y_train, y_test created through sklearn train_test_split. They contain text data in string format. Convert them to float numbers.

X_train = [['a', 'b'], ['c', 'd']]
y_train = ['a', 'b']
X_test = [['a', 'b'], ['c', 'd']]
y_test = ['a', 'b']

def convert_to_float(text_data):
    return text_data.astype(float)
    
X_train = convert_to_float(X_train)
y_train = convert_to_float(y_train)