rov-server/lr_model.py

#coding utf-8
import json
import math
def load_json(filename):
    with open(filename, 'r') as fin:
        json_data = json.load(fin)
    return json_data

def sigmoid(x):
    return 1.0 / (1.0 + math.exp(-x))

online_w = load_json('./ad_out_v1_online_w.json')

def get_online_score(online_features):
    score = online_w.get('bias', 0.0)
    score += sum([online_w.get('#'.join([k, v]), 0.0) for k, v in online_features.items()])
    return score

def get_final_score(online_features, offline_score):
    online_score = get_online_score(online_features)
    final_score = online_score + offline_score
    final_score = sigmoid(final_score)
    return final_score, online_score