def _build_models_from_dataset(self, dataset: Dataset, scaler=None):
"""
Build all of the GPR models from scratch
"""
df = dataset.get_dataframe()
metrics = dataset.get_metric_headers()
workload_ids = dataset.get_workload_ids()
knob_headers = dataset.get_tuning_knob_headers()
total_gprs = len(workload_ids) * len(metrics)
with tqdm(total=total_gprs) as pbar:
for w in workload_ids:
workloads = df[df['workload id'] == w]
for m in metrics:
X = workloads[knob_headers].values
if scaler is not None:
X = scaler.transform(X)
y = workloads[m].values
m_file_name = m \
.replace('_', '-') \
.replace('/', '-') \
.replace('%', '-')
# krasserm.github.io/2018/03/19/gaussian-processes#effect-of-kernel-parameters-and-noise-parameter
restarts = 10
# sigma_f, l
kernel = ConstantKernel(10.0) * RBF(y.std())
# sigma_y
alpha = 0.1
model = GaussianProcessRegressor(
kernel=kernel,
n_restarts_optimizer=restarts,
alpha=alpha,
normalize_y=True)
model.fit(X, y)
self.models[f"wl_{w}_{m_file_name}.pickle"] = model
pbar.update(1)
def main():
"""
Main method for the script.
"""
dataset = Dataset(file_path=DATASET_PATHS[CONFIG.dataset])
df = dataset.get_dataframe()
# remove columns that are constant values
metric_headers = dataset.get_metric_headers()
constant_headers = []
variable_headers = []
for header in metric_headers:
if np.unique(df[header].values).size > 1:
variable_headers.append(header)
else:
constant_headers.append(header)
metric_headers = variable_headers
dataset = Dataset(dataframe=df.drop(constant_headers, axis=1))
raw_metrics = dataset.get_metrics()
metrics = raw_metrics.T
# factor analysis
LOG.info('Starting factor analysis with %s factors...', CONFIG.num_factors)
start = time()
# model = FactorAnalysis(n_components=CONFIG.num_factors)
# factors = model.fit_transform(metrics) # num_metrics * num_factors
rng = np.random.RandomState(74)
model = GaussianRandomProjection(eps=0.999, random_state=rng)
factors = model.fit_transform(metrics)
LOG.debug('Dimension before factor analysis: %s', metrics.shape)
LOG.debug('Dimension after factor analysis: %s', factors.shape)
LOG.info('Finished factor analysis in %s seconds.', round(time() - start))
# clustering
if CONFIG.model == 'kmeans':
model = build_k_means(factors)
elif CONFIG.model == 'kmedoids':
model = build_k_medoids(factors)
else:
raise ValueError('Unrecognized model: %s', CONFIG.model)
# find cluster center
labels = model.labels_
# each dimension in transformed_data is the distance to the cluster
# centers.
transformed_data = model.transform(factors)
leftover_metrics = []
for i in np.unique(labels):
# index of the points for the ith cluster
cluster_member_idx = np.argwhere(labels == i).squeeze(1)
cluster_members = transformed_data[cluster_member_idx]
# find the index of the minimum-distance point to the center
closest_member = cluster_member_idx[np.argmin(cluster_members[:, i])]
leftover_metrics.append(metric_headers[closest_member])
# latency needs to be in the metrics
if 'latency' not in leftover_metrics:
leftover_metrics += ['latency']
with open(CONFIG.output_path, 'w') as file:
file.writelines('\n'.join(leftover_metrics))
