Spatio-Temporal Graph Convolutional Networks: A Deep Learning Framework for Traffic Forecasting

Timely accurate traffic forecast is crucial for urban traffic control and guidance. Due to the high nonlinearity and complexity of traffic flow, traditional methods cannot satisfy the requirements of mid-and-long term prediction tasks and often neglect spatial and temporal dependencies. In this paper, we propose a novel deep learning framework, Spatio-Temporal Graph Convolutional Networks (STGCN), to tackle the time series prediction problem in traffic domain. Instead of applying regular convolutional and recurrent units, we formulate the problem on graphs and build the model with complete convolutional structures, which enable much faster training speed with fewer parameters. Experiments show that our model STGCN effectively captures comprehensive spatio-temporal correlations through modeling multi-scale traffic networks and consistently outperforms state-of-the-art baselines on various real-world traffic datasets.Comment: Proceedings of the 27th International Joint Conference on Artificial Intelligenc

2,3-Bis(methyl­sulfan­yl)-1,4,5,8-tetra­thia­fulvalene

In the title compound, C8H8S6, the five-membered rings form a dihedral angle of 25.06 (9)°. In the absence of short inter­molecular contacts, the mol­ecules are packed by van der Waals forces in the crystal

Opinion dynamics on directed small-world networks

In this paper, we investigate the self-affirmation effect on formation of public opinion in a directed small-world social network. The system presents a non-equilibrium phase transition from a consensus state to a disordered state with coexistence of opinions. The dynamical behaviors are very sensitive to the density of long-range interactions and the strength of self-affirmation. When the long-range interactions are sparse and individual generally does not insist on his/her opinion, the system will display a continuous phase transition, in the opposite case with high self-affirmation strength and dense long-range interactions, the system does not display a phase transition. Between those two extreme cases, the system undergoes a discontinuous phase transition.Comment: 6 pages, 5 figure

2,2,2-Trifluoro-N-(4-methyl-2-oxo-2H-chromen-7-yl)acetamide

In the title mol­ecule, C12H8F3NO3, the trifluoro­methyl group is rotationally disordered over three orientations in a 0.5:0.3:0.2 ratio. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules related by translation into chains along the c axis. The crystal packing exhibits π–π inter­actions between the pyran rings of neighboring mol­ecules [centroid–centroid distance = 3.462 (4) Å] and short C⋯O contacts of 3.149 (4) Å

7-Diethyl­amino-2-oxo-2H-chromene-3-carbaldehyde

In the title compound, C14H15NO3, all non-H atoms except for those of the methyl and the disordered ethyl groupare approximately co-planar, the largest deviation from the mean plane being 0.0223 (13) Å at the N atom. In the crystal, the packing of mol­ecules through weak inter­molecular C—H⋯O hydrogen-bonding inter­actions leads to the formation of layers parallel to bc plane. Within these layers, there exist slipped π–π stacking inter­actions between symmetry-related fused rings [centroid–centroid distances = 3.527 (3) and 3.554 (3), slippage = 0.988 and 1.011 Å, respectively]. One ethyl group is disordered over two sets of sites with site-occupation factors of 0.54 and 0.46

2-[4,5-Bis(ethyl­sulfan­yl)-1,3-dithiol-2-yl­idene]-5-(4-methoxy­phen­yl)-5H-1,3-dithiolo[4,5-c]pyrrole

The asymmetric unit of the title compound, C19H19NOS6, contains two independent mol­ecules with different conformations of the ethyl groups. The dihedral angles between the pyrrole and benzene rings are 14.19 (14) and 16.29 (17)° in the two molecules. In the absence of short inter­molecular contacts, in the crystal, the mol­ecules are packed with their long axes parallel to [10]

4-(Diethyl­amino)­salicyl­aldehyde azine

The title compound, C22H30N4O2, has a crystallographic inversion center located at the mid-point of the N—N single bond. Apart from the four ethyl C atoms, the non-H atoms are nearly coplanar with a mean deviation of 0.0596 (2) Å. An intra­molecular O—H⋯N hydrogen bond occurs. In the crystal, weak inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into layers parallel to (100)

5-(4-Methyl­phenyl­sulfon­yl)-1,3-dithiolo[4,5-c]pyrrole-2-thione

The asymmetric unit of the title compound, C12H9NO2S4, contains one half-mol­ecule with the N, two S amd four C atoms lying on a mirror plane. The mol­ecule exhibits a V-shaped conformation, with a dihedral angle of 87.00 (7)° between the benzene and dithiol­opyrrole rings. The methyl group was treated as rotationally disordered between two orientations in a 1:1 ratio. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into chains in [010]