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| Title: | 受時序空間資訊變動影響之停車機率預測與路線搜尋
Parking Space Probability Prediction and Route Planning Affected by Spatio-Temporal Information Fluctuation |
| Authors: | 葉冠宏
YEH, KUAN-HUNG |
| Contributors: | 張宏慶
CHANG, HUNG-CHIN
葉冠宏
YEH, KUAN-HUNG |
| Keywords: | 停車位搜尋
深度強化學習
時空圖神經網路
Parking Space Searching
Reinforcement Learning
Spatio-Temporal Graph Neural Network |
| Date: | 2023 |
| Issue Date: | 2023-09-01 15:22:48 (UTC+8) |
| Abstract: | 隨著城市內的購車人口越來越多，停車位搜尋的需求也隨之提高。然而，由於城市空
間有限，因此距離自己最近的停車格不見得隨時都會有空位。近年來，有許多應用程
式可以雲端地提供駕駛人各地停車位空位的資訊，以供其作參考。也有許多研究是聚
焦在如何利用過往停車格變化的資訊來去用模型預測未來每個時間點的停車空位數。
然而，這些資訊往往並未考量到駕駛人驅車前往中間所需付出的距離、時間差距等等
情況，因此我們無法有效地結合所預測機率的時間點和抵達所需時間等因素。在駕駛
人前往某個停車格的路途當中，有可能因為過程中會有塞車、或是距離遙遠等情況而
造成抵達目的地停車格時，機率已經有所變化。除此之外，近年來，也有一些研究是
利用道路本身所記載的過往資訊，結合相關的啟發式演算法或是強化學習演算法去提
供代理人搜尋停車位的路線建議。然而，這些研究仍然未考量到代理人與停車格目的
地之間的距離關係，抵達目的地前所需的時間等，也並未考量到停車格空位的機率變
化，還有代理人與周邊各個停車格之間的地理拓樸關係。因此，本研究的貢獻在於如
何同時整合並考量這些因素，並設計出一個好的效用函數，使模型做出訓練，提供代
理人一個好的路線建議，以最快的時間找尋到停車位。
在本研究的實驗中，我比較了深度強化學習模型 Agent57 和 DQN 在停車位搜尋問題上
的效率差異。在模型中，我加入了 ST-GNN 的神經網路架構以利獲取道路間和停車格
之間的地理拓樸關係，以及資訊時序變化。除此之外，我也設計了相關的回饋函式，
使模型能考量到代理人在抵達停車格前由於塞車、旅行距離所造成未來的機率變化。
由於實驗的資料難以取得，因此本研究以 SUMO 模擬器(Simulation of Urban MObility)，
根據所設定的環境，給予不一樣的環境車流，以測試不同模型在不同壅塞程度、不同
停車需求程度，以及在綜合或是單一的設定環境中彈性應變的能力。
As more people buying cars, the demand for searching parking space also increases. However,
due to limited resources, the nearest parking space is not always available to park.
Recently, some applications provide drivers with instant information of vacant parking space
around the city, which enables drivers to decide the direction to go by themselves. It takes time
for drivers to arrive at the parking space from the spot they search for the information. Hence,
the decision they made at the beginning may not be accurate because the environment has
changed and drivers don’t know any information about the future. Many researches have
studied on how to predict future amount of parking space by utilizing the historical data.
Nevertheless, not many of the researches have related the probabilities of the future vacant
parking space with the suggestion of driving route.
In our research, we use ST-GNN model to extract topological relationship between different
parking spaces and roads nearby from past few timestamps to predict the concerned parking
space. In order to guide the agent to find the available parking space as soon as possible, we
use reinforcement learning model to decide which direction to go. Here, we compare two
reinforcement models, Agent57 and Deep Q learning.
When the agent drives towards the destination, traffic jam would slow down the speed of
vehicle and increase time required to travel. Besides, longer distance between two spots usually
means more time spent on driving. Considering these factors, we design a proper reward
function, which takes the probabilities predicted by ST-GNN model into calculation. Therefore,
we are able to calculate the future estimated probabilities of finding vacant parking space when
vehicle arrives at the destination. The reward function is weighted by time required to travel,
and is fed into the reinforcement model.
Our contribution is to design a proper reward function and solves the problem of estimated
probability variance induced by travelling time. The model is able to provide user with advice
of finding available parking space as soon as possible. Due to the difficulty of acquiring real
world data, we conduct the experiment by SUMO (Simulation of Urban Mobility) simulator.
To test the robustness of our model, we also design different environment setting. |
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國立政治大學資訊科學系，2022，https://hdl.handle.net/11296/2j9v22。 |
| Description: | 碩士
國立政治大學
資訊科學系
108753208 |
| Source URI: | http://thesis.lib.nccu.edu.tw/record/#G0108753208 |
| Data Type: | thesis |
| Appears in Collections: | [資訊科學系] 學位論文
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