class WifiLocalizer:
def __init__(self, sd_instance, model_name='kb', name='wifi_ble'):
self.parser = Parser().getInstance()
self.model_name, self.name = model_name, name
self.sd_instance = sd_instance
self.id_sd = self.sd_instance.id
try:
self.model_predict_building = self.parser.load_sd_model(self.id_sd)
except:
print("WARNING: init SD model from scratch")
self.model_predict_building = self.__train_sd_model(True)
try:
self.models_building_floor = self.parser.load_building_floor_models(
self.id_sd)
except:
print("WARNING: init building models from scratch")
self.models_building_floor = {
b.id: self.__train_building_floor_model(b.id, True)
for b in self.sd_instance.buildings
}
try:
self.models_building = self.parser.load_building_models(self.id_sd)
except:
print("WARNING: init building models from scratch")
self.models_building = self.__train_all_building_models(True)
def __create_model(self):
if self.model_name == 'kb':
model = KNeighborsClassifier(n_neighbors=5)
elif self.model_name == 'linear':
model = LogisticRegression()
elif self.model_name == 'nb':
model = GaussianNB()
else:
raise Exception()
return model
def __train_building_floor_model(self, id_building, do_cv=False):
df = self.parser.read_df_building(self.id_sd, id_building)
model = self.__create_model()
X = df[[
col for col in df.columns
if "wifi" in col or ("ble" in col and "rndm" not in col)
]]
X_fill = X.fillna(-120)
y = df['z']
if do_cv:
self.do_cv(model, X_fill, y, 'building')
model.fit(X_fill, y)
self.parser.save_building_floor_model(self.id_sd, id_building,
self.model_name, self.name,
model)
return model
def __train_all_building_models(self, do_cv=False):
models = {
b.id: self.__train_building_model(b.id, do_cv)
for b in self.sd_instance.buildings
}
return models
def __train_building_model(self, id_building, do_cv=False):
df = self.parser.read_df_building(self.id_sd, id_building)
model = self.__create_model()
building: Building = self.sd_instance.get_building_from_id(id_building)
min_z, max_z = building.getFloorRange()
models = []
for z in range(min_z, max_z):
X = df[[
col for col in df.columns
if "wifi" in col or ("ble" in col and "rndm" not in col)
]]
X_fill = X.fillna(-120)
df['label'] = df.apply(lambda row: self.__get_position(
row['x'], row['y'], id_building),
axis=1)
y = df['label']
if do_cv:
self.do_cv(model, X_fill, y, 'building')
model.fit(X_fill, y)
self.parser.save_building_model(self.id_sd, id_building, z,
self.model_name, self.name, model)
models.append(model)
return model
def __train_sd_model(self, do_cv=False):
df = self.parser.read_df_sd(self.sd_instance)
model = self.__create_model()
X = df[[
col for col in df.columns
if "wifi" in col or ("ble" in col and "rndm" not in col)
]]
X_fill = X.fillna(-120)
y = df['id_building']
if do_cv:
self.do_cv(model, X_fill, y, 'building')
model.fit(X_fill, y)
self.parser.save_sd_model(self.id_sd, self.model_name, self.name,
model)
return model
def do_cv(self, model, X, y, name, k=5):
splits_x, splits_y = [], []
for i in range(k):
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.33)
splits_x.append((X_train, X_test))
splits_y.append((y_train, y_test))
scores = []
for i in range(k):
X_train, X_test = splits_x[i]
y_train, y_test = splits_y[i]
model.fit(X_train, y_train)
scores.append(model.score(X_test, y_test))
print("CNN SCORE for {} -> {}".format(name, mean(scores)))
def __get_position(
self, x, y,
id_building): #min_x = 0, max_x = 12, min_y = 0, max_y = 14):
x_intervals, y_intervals = self.get_intervals(id_building)
x_block = [
i for i, interval in enumerate(x_intervals)
if interval[0] <= x <= interval[1]
][0]
y_block = [
i for i, interval in enumerate(y_intervals)
if interval[0] <= y <= interval[1]
][0]
return x_block + y_block * len(x_intervals)
def get_intervals(self, id_building):
building: Building = self.sd_instance.get_building_from_id(id_building)
x_intervals = building.horizontal_grid_intervals()
y_intervals = building.vertical_grid_intervals()
return x_intervals, y_intervals
def infer_floor(self,
wifi_features,
ble_features,
id_building,
also_ble=True):
model = self.models_building_floor[id_building]
df = self.parser.read_df_sd(self.sd_instance)
features = WifiLocalizer.build_features(df, wifi_features,
ble_features, also_ble)
id_building = model.predict(np.array(features).reshape(1, -1))
return id_building[0]
def infer_building(self, wifi_features, ble_features, also_ble=True):
model = self.model_predict_building
df = self.parser.read_df_sd(self.sd_instance)
features = WifiLocalizer.build_features(df, wifi_features,
ble_features, also_ble)
id_building = model.predict(np.array(features).reshape(1, -1))
return id_building[0]
def infer_position(self,
wifi_features,
ble_features,
id_building,
floor,
also_ble=True):
model = self.models_building[id_building]
df = self.parser.read_df_building(self.id_sd, id_building)
features = WifiLocalizer.build_features(df, wifi_features,
ble_features, also_ble)
position = model.predict(np.array(features).reshape(1, -1))
return position[0]
@staticmethod
def build_features(df, wifi_features, ble_features, also_ble=True):
wifi_cols = [col for col in df.columns if "wifi" in col]
features = []
for wifi_col in wifi_cols:
rssi_vals = [
wifi['rssi'] for wifi in wifi_features
if "wifi_{}".format(wifi['mac']) == wifi_col
]
rssi = -120
if len(rssi_vals) > 0:
rssi = rssi_vals[0]
features.append(rssi)
if also_ble:
ble_cols = [
col for col in df.columns if "ble" in col and "rndm" not in col
]
for ble_col in ble_cols:
TIME_THRESHOLD = 3 # 3 seconds of threshold: if the difference is higher I don't take them
ble_mac = ble_col.split("_")[1]
recent_values = [
b_val["value"] for b_val in ble_features[ble_mac]
if b_val["timestamp"] +
datetime.timedelta(0, seconds=TIME_THRESHOLD) >
datetime.datetime.now()
]
if len(recent_values) <= 0:
recent_values = [-100]
features.append(mean(recent_values))
return features
][0]
y_block = [
i for i, interval in enumerate(y_intervals)
if interval[0] <= y <= interval[1]
][0]
max_x_block, max_y_block = 3, 3
# x_block, y_block = min(int(x/3), 2), min(int(y/5), 2)
return x_block + y_block * max_x_block
if __name__ == '__main__':
parser = Parser().getInstance()
id_building = 1
id_sd = 0
floor = 0
df = parser.read_df_building(id_sd, id_building)
df['label'] = df.apply(lambda row: getPosition(row['x'], row['y']), axis=1)
also_ble = True
df['label'].plot.hist(bins=9)
plt.show()
if also_ble:
X = df[[
col for col in df.columns
if "wifi" in col or ("ble" in col and "rndm" not in col)
]]
else:
X = df[[col for col in df.columns if "wifi" in col]]
X_fill = X.fillna(-120)
# X_fill = StandardScaler().fit_transform(X_fill)
