def test_oxford5k():
random_state = 40
data = load_oxford_data()
train, test = train_test_split(data,
test_size=0.2,
random_state=random_state)
# Compute distance-sorted neighbors in training set for each point in test set
nns = compute_all_neighbors(test, train)
# Fit model
m = LOPQModel(V=16, M=8)
m.fit(train, n_init=1, random_state=random_state)
# Assert correct code computation
assert_equal(m.predict(test[0]),
((3, 2), (14, 164, 83, 49, 185, 29, 196, 250)))
# Assert low number of empty cells
h = get_cell_histogram(train, m)
assert_equal(np.count_nonzero(h == 0), 6)
# Assert true NN recall on test set
searcher = LOPQSearcher(m)
searcher.add_data(train)
recall, _ = get_recall(searcher, test, nns)
assert_true(np.all(recall > [0.51, 0.92, 0.97, 0.97]))
# Test partial fitting with just coarse quantizers
m2 = LOPQModel(V=16, M=8, parameters=(m.Cs, None, None, None))
m2.fit(train, n_init=1, random_state=random_state)
searcher = LOPQSearcher(m2)
searcher.add_data(train)
recall, _ = get_recall(searcher, test, nns)
assert_true(np.all(recall > [0.51, 0.92, 0.97, 0.97]))
# Test partial fitting with coarse quantizers and rotations
m3 = LOPQModel(V=16, M=8, parameters=(m.Cs, m.Rs, m.mus, None))
m3.fit(train, n_init=1, random_state=random_state)
searcher = LOPQSearcher(m3)
searcher.add_data(train)
recall, _ = get_recall(searcher, test, nns)
assert_true(np.all(recall > [0.51, 0.92, 0.97, 0.97]))
def test_proto_partial():
import os
filename = './temp_proto_partial.lopq'
c = (np.random.rand(8, 8), np.random.rand(8, 8))
m = LOPQModel(parameters=(c, None, None, None))
m.export_proto(filename)
m2 = LOPQModel.load_proto(filename)
assert_equal(m.V, m2.V)
assert_equal(m.M, m2.M)
assert_equal(m.subquantizer_clusters, m2.subquantizer_clusters)
assert_true(np.allclose(m.Cs[0], m2.Cs[0]))
assert_true(m.Rs == m2.Rs)
assert_true(m.mus == m2.mus)
assert_true(m.subquantizers == m.subquantizers)
os.remove(filename)
if STEP_COARSE in args.steps:
Cs = train_coarse(sc, data, args.V, seed=args.seed)
else:
Cs = model.Cs
# Get rotations
if STEP_ROTATION in args.steps:
Rs, mus, counts = train_rotations(sc, data, args.M, Cs)
else:
Rs = model.Rs
mus = model.mus
# Get subquantizers
if STEP_SUBQUANT in args.steps:
model = LOPQModel(V=args.V,
M=args.M,
subquantizer_clusters=args.subquantizer_clusters,
parameters=(Cs, Rs, mus, None))
if args.subquantizer_sampling_ratio != 1.0:
data = data.sample(False, args.subquantizer_sampling_ratio,
args.seed)
subs = train_subquantizers(sc,
data,
args.M,
args.subquantizer_clusters,
model,
seed=args.seed)
# Final output model
model = LOPQModel(V=args.V,
def train_index(self):
if self.model_type == "lopq":
train_np = self.get_train_features(self.nb_train,
nb_min_train=self.nb_min_train)
print("Got train features array with shape: {}".format(
train_np.shape))
nb_train_feats = train_np.shape[0]
sys.stdout.flush()
if nb_train_feats >= self.nb_train:
from lopq.model import LOPQModel
# we could have default values for those parameters and/or heuristic to estimate them based on data count...
lopq_model = LOPQModel(
V=self.model_params['V'],
M=self.model_params['M'],
subquantizer_clusters=self.model_params['subq'])
# we could have separate training/indexing features
msg = "[{}.train_model: info] Starting local training of 'lopq' model with parameters {} using {} features."
print(msg.format(self.pp, self.model_params, nb_train_feats))
start_train = time.time()
# specify a n_init < 10 (default value) to speed-up training?
lopq_model.fit(train_np, verbose=True)
# save model
self.storer.save(self.build_model_str(), lopq_model)
print(
"[{}.train_model: info] Trained lopq model in {}s.".format(
self.pp,
time.time() - start_train))
return lopq_model
else:
msg = "[{}.train_model: error] Could not train model, not enough training samples."
print(msg.format(self.pp))
elif self.model_type == "lopq_pca":
# lopq_pca training.
from lopq.model import LOPQModelPCA
# we could have default values for those parameters
# and/or heuristic to estimate them based on data count...
lopq_model = LOPQModelPCA(
V=self.model_params['V'],
M=self.model_params['M'],
subquantizer_clusters=self.model_params['subq'],
renorm=True)
# pca loading/training first
pca_model = self.storer.load(self.build_pca_model_str())
if pca_model is None:
train_np = self.get_train_features(
self.nb_train_pca, nb_min_train=self.nb_min_train_pca)
msg = "[{}.train_model: info] Training PCA model, keeping {} dimensions from features {}."
print(
msg.format(self.pp, self.model_params['pca'],
train_np.shape))
sys.stdout.flush()
start_train_pca = time.time()
lopq_model.fit_pca(train_np, pca_dims=self.model_params['pca'])
info_msg = "[{}.train_model: info] Trained pca model in {}s."
print(info_msg.format(self.pp, time.time() - start_train_pca))
del train_np
self.storer.save(self.build_pca_model_str(), {
"P": lopq_model.pca_P,
"mu": lopq_model.pca_mu
})
else:
lopq_model.pca_P = pca_model["P"]
lopq_model.pca_mu = pca_model["mu"]
# train model
train_np = self.get_train_features(self.nb_train,
lopq_pca_model=lopq_model,
nb_min_train=self.nb_min_train)
msg = "[{}.train_model: info] Training 'lopq_pca' model with parameters {} using features {}"
print(msg.format(self.pp, self.model_params, train_np.shape))
sys.stdout.flush()
start_train = time.time()
# specify a n_init < 10 (default value) to speed-up training?
lopq_model.fit(train_np,
verbose=True,
apply_pca=False,
train_pca=False)
# TODO: we could evaluate model based on reconstruction of some randomly sampled features?
# save model
self.storer.save(self.build_model_str(), lopq_model)
info_msg = "[{}.train_model: info] Trained lopq model in {}s."
print(info_msg.format(self.pp, time.time() - start_train))
sys.stdout.flush()
return lopq_model
# err_msg = "[{}.train_model: error] Local training of 'lopq_pca' model not yet implemented."
# raise NotImplementedError(err_msg.format(self.pp))
else:
err_msg = "[{}.train_model: error] Unknown 'lopq' type {}."
raise ValueError(err_msg.format(self.pp, self.model_type))
def make_random_model():
m = LOPQModel(V=5, M=4, subquantizer_clusters=10)
m.fit(np.random.RandomState(42).rand(200, 8), n_init=1)
return m
