国家重点基础研究发展计划 (973)(2015CB352502)
国家自然科学基金(61272092,61572289)
山东省自然科学基金(ZR2015FM002,ZR2016FB14)
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Figure 1
(Color online) Loc2Vec model network structure diagram
Figure 4
(Color online) Error distance statistic diagram of abnormal data
Figure 5
Semantic analysis framework of spatial temporal trajectory
Figure 6
(Color online) Location vector $K$-means clustering distribution ($K$=10). (a) Absolute number; (b) relative proportion
Figure 7
(Color online) Location vector $K$-means clustering geographic map. (a) All points; (b) top-30 points
Figure 8
(Color online) Location vector hierarchical clustering diagrams. (a) Hierarchical clustering dendrogram; (b) clustering geographic map
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| $e = 0$; |
| ${\rm SL} = \sum_{k=i-c}^{2c}{\rm Context}(L_{t_k}) \in \mathbb{R}^m$; |
| |
| $g = \alpha[1-h_k-\sigma({\rm SL}^{\rm T}\theta_{k-1})]$; |
| $e = e+ g\cdot\theta_{k-1}$; |
| $\theta_{k-1} = \theta_{k-1}+g\cdot {\rm SL}$; |
| |
| |
| $\widetilde{L_{t_i}} = \widetilde{L_{t_i}}+e$; |
| |
| |
| Symbol | Definition |
| $p$ | The path from the root node to the leaf node $L_{t_i}$ |
| $l$ | The number of nodes contained in the path $p$ |
| $p_1, p_2,\ldots, p_l$ | $l$ nodes in the path $p$, where $p_1$ is the root node and $p_l$ is the leaf node |
| $h_2, h_3,\ldots,h_l \in \{0, 1\}$ | Leaf node $L_{t_i}$ in the path $p$ corresponds to the Huffman Coding, |
| where $h_k$ represents the $k$th code, $p_1$ is not encoded | |
| $\theta_1, \theta_2,\ldots, \theta_l \in \mathbb{R}^m$ | The vectorization of the non-leaf node in the path $p$, |
| where $\theta_k$ represents the mapping vector for the $k^{th}$ non-leaf node |
| Attribute name | CHS name | Example |
| User ID (anonymized) | 匿名用户代码 | 32 |
| Venue ID* | 签到街道代码 | 44af9feef964a5202b351fe3 |
| Venue category ID* | 街道类型代码 | 4bf58dd8d48988d1c1941735 |
| Venue category name* | 街道类别名称 | Mexican Restaurant |
| Latitude, Longitude | 经纬度坐标 | 40.747738169430534, $-$73.98519814526952 |
| Time zone offset in minutes | UTC时差 | $-$240 |
| UTC time | 世界标准时间 | Tue Apr 03 18:15:33 +0000 2012 |
| Category | CHS name | Amount | Example |
| Food | 餐饮类 | 67 | Restaurant; Joint |
| Shop & service | 商贸服务类 | 61 | Shop; Store; Service |
| Outdoors & recreation | 户外休闲类 | 26 | Beach; Garden |
| Travel & transport | 旅游交通类 | 22 | Airport; Travel lounge |
| Public service | 公共服务类 | 21 | Bank; Temple |
| Education | 教育类 | 20 | School; College |
| Arts & entertainment | 艺术娱乐类 | 20 | Museum; Venue |
| Industry | 产业制造类 | 7 | Factory; Facility |
| Athletic & sport | 体育运动类 | 4 | Gym; Stadium |
| Community | 社区类 | 3 | Home; Neighborhood |
| Type | VID | LAT (Latitude) | LON (Longitude) | Offset (m) |
| Same GPS | 4b992b04f964a520726635e3 | 40.683120 | $-$73.975979 | 0 |
| 5089d4bce4b0f6951cdeb4f0 | ||||
| Same ID | 41390580f964a520dc1a1fe3 | 40.7420160433638 | $-$74.005163366761 | 5.876 |
| 40.7419894750989 | $-$74.0051174588942 |
| Parameter | CHS name | Corresponding parameter | Defaults |
| size | 向量维数 | $m$ | 100 |
| window | 训练窗口大小 | 2$c$ | 5 |
| sample | 高频降采样阈值 | – | 1E$-$3 |
| negative | 负例采样数 | – | 5 |
| threads | 程序线程数 | – | 12 |
| min-count | 低频词截断阈值 | – | 5 |
| alpha | 初始学习速率 | $\alpha$ | 0.05 |
| iter | 迭代次数 | – | 5 |
| Type | Distance | VID | Category | VCN | GPS | GEO |
| distance | ||||||
| Single | 0.674 | 4b546885f964a52031ba27e3 | Food | Food & drink shop | 35.654 139.544 | 24.828 |
| Single | 0.638 | 4bea5deb6295c9b6c05b8608 | Education | College | 35.656 139.544 | 230.291 |
| academic building | ||||||
| Single | 0.631 | 4b6f7d59f964a520a7f22ce3 | Education | University | 35.657 139.541 | 400.026 |
| 24 h | 0.682 | 4ec09a4fbe7b04923ccd270d | Outdoors & | Sculpture garden | 35.657 139.544 | 424.540 |
| Recreation | ||||||
| 24 h | 0.678 | 4b698217f964a5202ea52be3 | Food | Chinese restaurant | 35.653 139.544 | 63.646 |
| Workdays | 0.680 | 4cca4775177c370483661534 | Education | College | 35.658 139.544 | 468.477 |
| academic building | ||||||
| Workdays | 0.645 | 4ffee5dde4b04497d91e7c4c | Community | Home (private) | 35.669 139.553 | 1806.987 |
| Weekends | 0.685 | 4b5a88f1f964a52036ca28e3 | Shop & Service | Video store | 35.652 139.546 | 143.953 |
| Weekends | 0.612 | 4cb598229c7ba35db53c8b06 | Outdoors & Recreation | Bar | 35.651 139.543 | 337.812 |
| Type | AVG distance (m) | SD |
| Single | 251.205 | 150.886 |
| 24 h | 274.516 | 121.610 |
| Workdays | 462.714 | 489.566 |
| Weekends | 698.784 | 608.596 |
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