def prepare_water_treatment_data(data):
# Randomize Data
randomized_data = util.randomize_data(data.normal_data)
# Split Testing / Training Data
training_data, test_data = util.split_training_data(randomized_data)
# Split Features / Targets
training_features, training_targets = util.split_features_target(
training_data)
test_features, test_targets = util.split_features_target(test_data)
anomalous_features, anomalous_targets = util.split_features_target(
data.anomalous_data)
# Standardize Data
std_training_features, mean, std = util.standardize_data(training_features)
std_test_features, _, _ = util.standardize_data(test_features, mean, std)
std_anomalous_features, _, _ = util.standardize_data(
anomalous_features, mean, std)
# Impute missing values
imp = Imputer(missing_values='NaN', strategy='most_frequent', axis=0)
imp.fit(std_training_features)
return imp, std_training_features, std_test_features, std_anomalous_features
def execute(data, training_data_ratio=2.0 / 3.0, k=1):
"""
Execute the "Locally-Weighted" Linear Regression (using Closed-Form Linear Regression)
:param data: Raw Data frame parsed from CSV
:param training_data_ratio: The percent (0.0 to 1.0) of input data to use in training.
:param k: Smoothing parameter for local weight computation
:return: Nothing
"""
# 2. Randomize the data
randomized_data = util.randomize_data(data)
# 3. Select the first 2 / 3(round up) of the data for training and the remaining for testing
training_data, test_data = util.split_data(randomized_data,
training_data_ratio)
training_outputs = util.get_output(training_data)
# 4. Standardize the data(except for the last column of course) using the training data
standardized_training_data, mean, std = util.standardize_data(
util.get_features(training_data))
# Add offset column at the front
standardized_training_data.insert(0, "Bias", 1)
std_test_data, _, _ = util.standardize_data(util.get_features(test_data),
mean, std)
std_test_data.insert(0, "Bias", 1)
squared_errors = []
# 5. Then for each testing sample
for i in xrange(0, len(std_test_data)):
testing_sample = std_test_data.iloc[i]
expected_output = test_data.loc[testing_sample.name][-1]
theta_query = compute_theta_query(testing_sample,
standardized_training_data,
training_outputs, k)
# (b) Evaluate the testing sample using the local model.
actual_output = np.dot(testing_sample, theta_query)
# (c) Compute the squared error of the testing sample.
squared_errors.append(util.compute_se(expected_output, actual_output))
# 6. Compute the root mean squared error (RMSE)
sum_of_squared_errors = 0
for error in squared_errors:
sum_of_squared_errors += error
mean_squared_error = sum_of_squared_errors / len(squared_errors)
rmse = math.sqrt(mean_squared_error)
return rmse
def execute(dataframe, training_data_ratio=2.0 / 3):
"""
Execute Multi-class SVM
:param dataframe: The input dataset containing the classifier as the last column
:param training_data_ratio: The percentage of data to use for training (default: 2/3)
:return: A list of metrics on performance for the one-vs-many, and the accuracy of one-vs-one SVM
"""
# Seed our randomizer to ensure we get repeatable results
random.seed(0)
# 2. Randomizes the data.
randomized_data = util.randomize_data(dataframe)
# 3. Selects the first 2/3 (round up) of the data for training and the remaining for testing
training_data, test_data = util.split_data(randomized_data,
training_data_ratio)
# 4. Standardizes the data (except for the last column of course) using the training data
training_features, training_targets = util.split_features_target(
training_data)
std_training_features, mean, std = util.standardize_data(training_features)
# Due to the standard deviation being zero, we end up with NaN entries, reset them to zero
std_training_features.fillna(0, inplace=True)
test_features, test_targets = util.split_features_target(test_data)
std_test_features, _, _ = util.standardize_data(test_features, mean, std)
# Due to the standard deviation being zero, we end up with NaN entries, reset them to zero
std_test_features.fillna(0, inplace=True)
target_classes = training_targets.unique()
# 5. First trains and evaluates using a One vs All approach:
one_vs_many_metrics = execute_one_vs_many(std_test_features,
std_training_features,
target_classes, test_targets,
training_targets)
# 6. Trains and evaluates using a One vs One approach:
num_classified_incorrectly = execute_one_vs_one(std_test_features,
std_training_features,
target_classes,
test_targets,
training_targets)
num_classified_correctly = len(test_features) - num_classified_incorrectly
one_vs_one_accuracy = num_classified_correctly / float(len(test_features))
return one_vs_many_metrics, one_vs_one_accuracy
def execute(self, dataframe):
"""
Execute the Binary-Artificial Neural Network problem
:param dataframe: Input raw data
:return: (final test error, list of training errors for each training iteration)
"""
# 2. Randomizes the data.
print "Randomizing Data"
random_data = util.randomize_data(dataframe)
# 3. Selects the first 2/3 (round up) of the data for training and the remaining for testing
print "Splitting Test and Training Data"
training_data, test_data = util.split_data(random_data,
self._training_data_ratio)
# 4. Standardizes the data (except for the last column of course as well as the bias feature)
# using the training data
print "Standardizing Training Data"
standardized_training_data, mean, std = util.standardize_data(
self.__select_features(training_data))
# 5. Trains an artificial neural network using the training data
# Our last column is the label column
# 6. During the training process, compute the training error after each iteration.
# You will use this to plot the training error vs. iteration number.
expected_training_outputs = self.__select_target_labels(
training_data).values.reshape(-1, 1)
print "Training Neural Network"
training_errors = self._network.train_binary(
standardized_training_data, expected_training_outputs,
self._iterations)
# 7. Classifies the testing data using the trained neural network.
print "Classifying Testing Data"
expected_test_output = self.__select_target_labels(test_data)
std_test_data, _, _ = util.standardize_data(
self.__select_features(test_data), mean, std)
actual_test_output = self._network.evaluate(std_test_data.values)
# 8. Compute the testing error.
print "Computing Metrics"
self.__update_metrics(expected_test_output, actual_test_output)
test_error = self._metrics.calculate_error()
print "Test Error: ", test_error
return test_error, training_errors
def apply_solution(test_input, training_mean, training_std, weights):
"""
Apply the closed form linear regression to the given dataframe.
The input dataframe is expected to contain only the input columns, and not the output column
:param test_input: Non-Standardized Dataframe, the expected output column is expected to be excluded
:param weights: The weights produced by learning
:param training_mean: The mean value used in standardizing the training set
:param training_std: the standard deviation value using in standardizing the training set
:return:
"""
standardized_test_inputs, _, _ = util.standardize_data(
test_input, training_mean, training_std)
standardized_test_inputs.insert(0, "Bias", 1)
return standardized_test_inputs.dot(weights)
def execute(data, num_folds=5):
"""
Compute the Root Mean Squared Error using num_folds for cross validation
:param data: Raw Data frame parsed from CSV
:param num_folds: The number of folds to use
:return: Root Mean Squared Error
"""
assert data is not None, "data must be a valid DataFrame"
assert num_folds > 1, "num_folds must be greater than one."
# 2. Randomizes the data
randomized_data = util.randomize_data(data)
# 3. Creates S folds (for our purposes S = 5, but make your code generalizable, that is it should
# work for any legal value of S)
folds = divide_data(randomized_data, num_folds)
squared_errors = []
# 4. For i = 1 to S
for i in xrange(0, num_folds):
# (a) Select fold i as your testing data and the remaining (S - 1) folds as your training data
test_data = folds[i]
training_data = select_training_data(folds, i)
# (b) Standardizes the data (except for the last column of course) based on the training data
standardized_train_data, mean, std = util.standardize_data(
util.get_features(training_data))
# Add offset column at the front
standardized_train_data.insert(0, "Bias", 1)
# (c) Train a closed-form linear regression model
training_outputs = util.get_output(training_data)
weights = cflr.find_weights(standardized_train_data, training_outputs)
# (d) Compute the squared error for each sample in the current testing fold
expected = util.get_output(test_data)
actual = cflr.apply_solution(util.get_features(test_data), mean, std,
weights)
squared_error = (expected - actual)**2
squared_errors.append(squared_error)
# 5. Compute the RMSE using all the errors.
rmse = compute_rmse(len(data), squared_errors)
return rmse
def __init__(self, df_m15, df_h1, serial=False):
self.df_m15 = standardize_data(
df_m15, method="log_and_diff").dropna().reset_index(drop=True)
self.df_h1 = df_h1
self.net_worth = INITIAL_BALANCE
self.prev_net_worth = INITIAL_BALANCE
self.usd_held = INITIAL_BALANCE
self.eur_held = 0
self.current_step = 0
self.reward = 0
self.serial = serial
# trade history
self.trades = []
# our profit in last 5 trades
self.returns = np.zeros(10)
# index of episodes (1 episode equivalent to 1 week of trading)
self.episode_indices_m15, self.h1_indices = get_episode(
self.df_m15, self.df_h1)
self.action_space = spaces.Discrete(6)
# observation space, includes: OLHC prices (normalized), close price (unnormalized),
# time in minutes(encoded), day of week(encoded), action history, net worth changes history
# both minutes, days feature are encoded using sin and cos function to retain circularity
self.observation_space = spaces.Box(low=-10,
high=10,
shape=(12, WINDOW_SIZE + 1),
dtype=np.float16)
self.metrics = Metric(INITIAL_BALANCE)
self.setup_active_df()
self.agent_history = {
"actions":
np.zeros(len(self.active_df) + WINDOW_SIZE),
"net_worth":
np.zeros(len(self.active_df) + WINDOW_SIZE),
"eur_held":
np.zeros(len(self.active_df) + WINDOW_SIZE),
"usd_held":
np.full(len(self.active_df), self.usd_held / BALANCE_NORM_FACTOR)
}
def execute(data):
"""
:param data: Raw Data frame parsed from CSV
:return: Nothing
"""
# 2. Randomizes the data
randomized_data = util.randomize_data(data)
# 3. Selects the first 2/3 (round up) of the data for training and the remaining for testing
training_data_size = 2.0 / 3.0
training_data, test_data = util.split_data(randomized_data,
training_data_size)
# Capture the predicted outputs
training_outputs = training_data[training_data.columns[-1]]
# 4. Standardizes the data (except for the last column of course) using the training data
training_inputs, training_mean, training_std = util.standardize_data(
util.get_features(training_data))
# Add offset column at the front
training_inputs.insert(0, "Bias", 1)
# 5. Computes the closed-form solution of linear regression
weights = find_weights(training_inputs, training_outputs)
# 6. Applies the solution to the testing samples
test_input = util.get_features(test_data)
expected = util.get_output(test_data)
actual = apply_solution(test_input, training_mean, training_std, weights)
# 7. Computes the root mean squared error (RMSE)
rmse = util.compute_rmse(expected, actual)
return weights, rmse
def execute(data, training_data_ratio=2.0 / 3):
"""
Execute the Naive Bayes classification
:param data: Dataframe containing training and test data
:param training_data_ratio:
:return:
"""
spam_class_name = 1
not_spam_class_name = 0
# 2. Randomize the data.
print "Randomizing Data"
randomized_data = util.randomize_data(data)
# 3. Split the data in for training and testing
print "Splitting Data for Test and Training"
training_data, test_data = util.split_data(randomized_data, training_data_ratio)
# 4. Standardize Training Data (except for class labels)
print "Standardizing Training Data"
training_features, training_data_target = util.split_features_target(training_data)
std_training_features, mean, std = util.standardize_data(training_features)
# 5. Divides the training data into two groups: Spam samples, Non-Spam samples.
target_groups = training_data_target.groupby(training_data_target)
total_training_size = float(len(training_data))
print "Computing probability of priors"
data_class_probability = {class_name: len(target_group) / total_training_size
for (class_name, target_group) in target_groups}
# 6. Creates Normal models for each feature for each class.
print "Creating normal models for each feature, for each class"
models = {}
for class_name, target_group in target_groups:
models[class_name] = {}
for feature_name in training_features.columns:
dataset = std_training_features.loc[target_group.index][feature_name]
feature_mean = dataset.mean()
feature_std = dataset.std()
models[class_name][feature_name] = {"mean":feature_mean, "standard_deviation": feature_std}
# 7. Classify each testing sample using these models and choosing the class label based
# on which class probability is higher.
print "Evaluating models for each test data point"
test_features, test_targets = util.split_features_target(test_data)
std_test_features, _, _ = util.standardize_data(test_features, mean, std)
true_positives = 0
true_negatives = 0
false_positives = 0
false_negatives = 0
for i in xrange(len(std_test_features)):
probability_per_class = compute_posterior(models, data_class_probability, std_test_features.iloc[i])
# Select the class label of the class with highest probability
assigned_class = max(probability_per_class.iteritems(), key=operator.itemgetter(1))[0]
expected_class = test_targets.iloc[i]
# Tally up each of our counters for performance measurements
if expected_class == spam_class_name:
if assigned_class == spam_class_name:
true_positives += 1
else: # assigned_class == not_spam_class_name
false_negatives += 1
else: # expected_class == not_spam_class_name
if assigned_class == not_spam_class_name:
true_negatives += 1
else: # assigned_class == spam_class_name
false_positives += 1
# 8. Computes the statistics using the testing data results
metrics = BinaryClassifierMetric(true_positives, false_positives, true_negatives, false_negatives)
return metrics
def execute(data,
learning_rate=0.001,
training_data_ratio=2.0 / 3,
max_iterations=1000000):
"""
Perform Batch Gradient Descent
:param data: Raw Data frame parsed from CSV
:param learning_rate: The rate at which to advance along the gradient
:param training_data_ratio: The percent of given data to use for training (remaining percent is used for testing)
:param max_iterations: The maximum number of iterations to execute before exiting
:return: Nothing
"""
# 2. Randomizes the data
print "Randomizing Data"
randomized_data = util.randomize_data(data)
# 3. Selects the first 2 / 3 (round up) of the data for training and the remaining for testing
print "Selecting Training Data"
training_data, test_data = util.split_data(randomized_data,
training_data_ratio)
# 4. Standardizes the data(except for the last column of course) base on the training data
print "Standardizing Data"
std_training_data, mean, std = util.standardize_data(
util.get_features(training_data))
std_training_data.insert(0, "Bias", 1)
std_test_data, _, _ = util.standardize_data(util.get_features(test_data),
mean, std)
std_test_data.insert(0, "Bias", 1)
iteration = 0
prior_rmse = 0
current_rmse = 100 # Doesn't matter what this value is, so long as it doesn't equal prior rmse
eps = np.spacing(1)
N = len(std_training_data)
# Start with randomized values for theta
theta = np.array([random.uniform(-1, 1) for _ in xrange(0, 3)])
# Capture our expected values for the training data
expected = util.get_output(training_data)
test_data_expected = util.get_output(test_data)
# Capture the RMSE for test and training over all iterations
test_rmse_values = []
training_rmse_values = []
print "Performing Gradient Descent Linear Regression"
# 5. While the termination criteria (mentioned above in the implementation details) hasn't been met
while iteration <= max_iterations and abs(current_rmse -
prior_rmse) >= eps:
prior_rmse = current_rmse
# (a) Compute the RMSE of the training data
# By applying the current theta values to the training set & comparing results
actual = std_training_data.dot(theta)
current_rmse = util.compute_rmse(expected, actual)
# (b) While we can't let the testing set affect our training process, also compute the RMSE of
# the testing error at each iteration of the algorithm (it'll be interesting to see).
# Same thing as (a), but use test inputs / outputs
test_data_actual = std_test_data.dot(theta)
test_data_rmse = util.compute_rmse(test_data_expected,
test_data_actual)
# (c) Update each parameter using batch gradient descent
# By use of the learning rate
for i in xrange(len(theta)):
# We know the length of theta is the same as the num columns in std_training_data
errors = (actual - expected
) * std_training_data[std_training_data.columns[i]]
cumulative_error = errors.sum()
theta[i] -= learning_rate / N * cumulative_error
iteration += 1
test_rmse_values.append(test_data_rmse)
training_rmse_values.append(current_rmse)
print "Completed in {0} iterations".format(iteration)
print "Plotting Errors"
image_path = plot_rmse_values(test_rmse_values, training_rmse_values,
learning_rate)
print "Saved Image to '{0}'".format(image_path)
# 6. Compute the RMSE of the testing data.
print "Computing RMSE of Test Data"
test_data_actual = std_test_data.dot(theta)
test_data_rmse = util.compute_rmse(test_data_expected, test_data_actual)
return theta, test_data_rmse
def create_cross_validation_data(data,
num_folds=4,
normal_sample_size=None,
anomalous_sample_size=None):
"""
Create num_folds cross-validation datasets
:param data:
:param num_folds:
:param normal_sample_size: The number of samples to take from the normal data
:param anomalous_sample_size: The number of samples to take from the anomalous data
:return:
"""
if normal_sample_size is None:
normal_data = data.normal_data
else:
normal_sample_size = min(normal_sample_size, len(data.normal_data))
normal_data = data.normal_data.sample(normal_sample_size)
if anomalous_sample_size is None:
anomalous_data = data.anomalous_data
else:
anomalous_sample_size = min(anomalous_sample_size,
len(data.anomalous_data))
anomalous_data = data.anomalous_data.sample(anomalous_sample_size)
randomized_data = util.randomize_data(normal_data)
randomized_features, _ = util.split_features_target(randomized_data)
anomaly_features, _ = util.split_features_target(anomalous_data)
datasets = []
shuffler = ShuffleSplit(n_splits=num_folds,
train_size=1 / float(num_folds),
test_size=None,
random_state=0)
for train_index, test_index in shuffler.split(randomized_features):
training_features = randomized_features.iloc[train_index]
test_features = randomized_features.iloc[test_index]
imputer = Imputer(missing_values='NaN',
strategy='most_frequent',
axis=0)
std_training_features, mean, std = util.standardize_data(
training_features)
imputer.fit(std_training_features)
std_training_features = imputer.transform(std_training_features)
std_test_features, _, _ = util.standardize_data(
test_features, mean, std)
std_test_features = imputer.transform(std_test_features)
std_anomaly_features, _, _ = util.standardize_data(
anomaly_features, mean, std)
std_anomaly_features = imputer.transform(std_anomaly_features)
datasets.append(
CrossValidationDataSet(imputer, std_training_features,
std_test_features, std_anomaly_features))
return datasets
